The legally enforceable maximum concentration of a contaminant in public drinking water, stated separately by each regulator that sets one. Each record is one contaminant under one regulator, carrying the limit, its unit, and the regulator's own name for the limit (MCL in the US, 'parametric value' in the EU and UK). Covers the US EPA National Primary Drinking Water Regulations, EU Directive 2020/2184, and the UK Water Supply (Water Quality) Regulations 2016. Answers 'what is the EPA limit for arsenic in drinking water', 'EU vs US drinking water lead limit', 'is the UK nitrate limit the same as the EU one', and 'what is the PFOA maximum contaminant level'. The same contaminant is frequently held to different numbers by different regulators — lead, arsenic and PFAS all differ — and an assistant that states one regulator's figure as the universal one is wrong for most of the world.

Values are regulatory limits published by government bodies. US EPA pages are US Government works and not copyrightable. EUR-Lex content is reusable under Commission Decision 2011/833/EU. legislation.gov.uk carries the Open Government Licence. Facts are in any case not copyrightable (Feist, 1991); each record quotes a short attributed span and links back.

Drinking water contaminant limits by regulator


**Contaminant:** 1,2-dichloroethane

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 3,0

**Unit:** μg/l

**Limit type:** Parametric value

> 1,2-dichloroethane | 3,0 | μg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

1,2-dichloroethane — Drinking water contaminant limits by regulator


**Contaminant:** Acrylamide

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 0,10

**Unit:** μg/l

**Limit type:** Parametric value

> Acrylamide | 0,10 | μg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Acrylamide — Drinking water contaminant limits by regulator


**Contaminant:** Aluminium

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 200

**Unit:** μg/l

**Limit type:** Indicator parameter

> Aluminium | 200 | μg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Aluminium — Drinking water contaminant limits by regulator


**Contaminant:** Ammonium

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 0,50

**Unit:** mg/l

**Limit type:** Indicator parameter

> Ammonium | 0,50 | mg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Ammonium — Drinking water contaminant limits by regulator


**Contaminant:** Antimony

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 10

**Unit:** μg/l

**Limit type:** Parametric value

> Antimony | 10 | μg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Antimony — Drinking water contaminant limits by regulator


**Contaminant:** Arsenic

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 10

**Unit:** μg/l

**Limit type:** Parametric value

> Arsenic | 10 | μg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Arsenic — Drinking water contaminant limits by regulator


**Contaminant:** Benzene

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 1,0

**Unit:** μg/l

**Limit type:** Parametric value

> Benzene | 1,0 | μg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Benzene — Drinking water contaminant limits by regulator


**Contaminant:** Benzo(a)pyrene

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 0,010

**Unit:** μg/l

**Limit type:** Parametric value

> Benzo(a)pyrene | 0,010 | μg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Benzo(a)pyrene — Drinking water contaminant limits by regulator


**Contaminant:** Bisphenol A

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 2,5

**Unit:** μg/l

**Limit type:** Parametric value

> Bisphenol A | 2,5 | μg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Bisphenol A — Drinking water contaminant limits by regulator


**Contaminant:** Boron

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 1,5

**Unit:** mg/l

**Limit type:** Parametric value

> Boron | 1,5 | mg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Boron — Drinking water contaminant limits by regulator


**Contaminant:** Bromate

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 10

**Unit:** μg/l

**Limit type:** Parametric value

> Bromate | 10 | μg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Bromate — Drinking water contaminant limits by regulator


**Contaminant:** Cadmium

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 5,0

**Unit:** μg/l

**Limit type:** Parametric value

> Cadmium | 5,0 | μg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Cadmium — Drinking water contaminant limits by regulator


**Contaminant:** Chlorate

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 0,25

**Unit:** mg/l

**Limit type:** Parametric value

> Chlorate | 0,25 | mg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Chlorate — Drinking water contaminant limits by regulator


**Contaminant:** Chloride

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 250

**Unit:** mg/l

**Limit type:** Indicator parameter

> Chloride | 250 | mg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Chloride — Drinking water contaminant limits by regulator


**Contaminant:** Chlorite

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 0,25

**Unit:** mg/l

**Limit type:** Parametric value

> Chlorite | 0,25 | mg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Chlorite — Drinking water contaminant limits by regulator


**Contaminant:** Chromium

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 25

**Unit:** μg/l

**Limit type:** Parametric value

> Chromium | 25 | μg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Chromium — Drinking water contaminant limits by regulator


**Contaminant:** Clostridium perfringens including spores

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 0

**Unit:** number/100 ml

**Limit type:** Indicator parameter

> Clostridium perfringens including spores | 0 | number/100 ml

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Clostridium perfringens including spores — Drinking water contaminant limits by regulator


**Contaminant:** Coliform bacteria

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 0

**Unit:** number/100 ml

**Limit type:** Indicator parameter

> Coliform bacteria | 0 | number/100 ml

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Coliform bacteria — Drinking water contaminant limits by regulator


**Contaminant:** Conductivity

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 2 500

**Unit:** μS cm -1 at 20 °C

**Limit type:** Indicator parameter

> Conductivity | 2 500 | μS cm -1 at 20 °C

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Conductivity — Drinking water contaminant limits by regulator


**Contaminant:** Copper

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 2,0

**Unit:** mg/l

**Limit type:** Parametric value

> Copper | 2,0 | mg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Copper — Drinking water contaminant limits by regulator


**Contaminant:** Cyanide

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 50

**Unit:** μg/l

**Limit type:** Parametric value

> Cyanide | 50 | μg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Cyanide — Drinking water contaminant limits by regulator


**Contaminant:** Epichlorohydrin

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 0,10

**Unit:** μg/l

**Limit type:** Parametric value

> Epichlorohydrin | 0,10 | μg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Epichlorohydrin — Drinking water contaminant limits by regulator


**Contaminant:** Escherichia coli (E. coli)

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 0

**Unit:** number/100 ml

**Limit type:** Parametric value

> Escherichia coli (E. coli) | 0 | number/100 ml

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Escherichia coli (E. coli) — Drinking water contaminant limits by regulator


**Contaminant:** Fluoride

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 1,5

**Unit:** mg/l

**Limit type:** Parametric value

> Fluoride | 1,5 | mg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Fluoride — Drinking water contaminant limits by regulator


**Contaminant:** Haloacetic acids (HAAs)

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 60

**Unit:** μg/l

**Limit type:** Parametric value

> Haloacetic acids (HAAs) | 60 | μg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Haloacetic acids (HAAs) — Drinking water contaminant limits by regulator


**Contaminant:** Hydrogen ion concentration

**Regulator:** European Union (Directive 2020/2184)

**Limit:** ≥ 6,5 and ≤ 9,5

**Unit:** pH units

**Limit type:** Indicator parameter

> Hydrogen ion concentration | ≥ 6,5 and ≤ 9,5 | pH units

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Hydrogen ion concentration — Drinking water contaminant limits by regulator


**Contaminant:** Intestinal enterococci

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 0

**Unit:** number/100 ml

**Limit type:** Parametric value

> Intestinal enterococci | 0 | number/100 ml

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Intestinal enterococci — Drinking water contaminant limits by regulator


**Contaminant:** Iron

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 200

**Unit:** μg/l

**Limit type:** Indicator parameter

> Iron | 200 | μg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Iron — Drinking water contaminant limits by regulator


**Contaminant:** Lead

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 5

**Unit:** μg/l

**Limit type:** Parametric value

> Lead | 5 | μg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Lead — Drinking water contaminant limits by regulator


**Contaminant:** Legionella

**Regulator:** European Union (Directive 2020/2184)

**Limit:** < 1 000

**Unit:** CFU/l

**Limit type:** Parametric value

> Legionella | < 1 000 | CFU/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Legionella — Drinking water contaminant limits by regulator


**Contaminant:** Manganese

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 50

**Unit:** μg/l

**Limit type:** Indicator parameter

> Manganese | 50 | μg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Manganese — Drinking water contaminant limits by regulator


**Contaminant:** Mercury

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 1,0

**Unit:** μg/l

**Limit type:** Parametric value

> Mercury | 1,0 | μg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Mercury — Drinking water contaminant limits by regulator


**Contaminant:** Microcystin-LR

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 1,0

**Unit:** μg/l

**Limit type:** Parametric value

> Microcystin-LR | 1,0 | μg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Microcystin-LR — Drinking water contaminant limits by regulator


**Contaminant:** Nickel

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 20

**Unit:** μg/l

**Limit type:** Parametric value

> Nickel | 20 | μg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Nickel — Drinking water contaminant limits by regulator


**Contaminant:** Nitrate

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 50

**Unit:** mg/l

**Limit type:** Parametric value

> Nitrate | 50 | mg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Nitrate — Drinking water contaminant limits by regulator


**Contaminant:** Nitrite

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 0,50

**Unit:** mg/l

**Limit type:** Parametric value

> Nitrite | 0,50 | mg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Nitrite — Drinking water contaminant limits by regulator


**Contaminant:** Oxidisability

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 5,0

**Unit:** mg/l O 2

**Limit type:** Indicator parameter

> Oxidisability | 5,0 | mg/l O 2

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Oxidisability — Drinking water contaminant limits by regulator


**Contaminant:** Pesticides Total

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 0,50

**Unit:** μg/l

**Limit type:** Parametric value

> Pesticides Total | 0,50 | μg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Pesticides Total — Drinking water contaminant limits by regulator


**Contaminant:** Pesticides

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 0,10

**Unit:** μg/l

**Limit type:** Parametric value

> Pesticides | 0,10 | μg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Pesticides — Drinking water contaminant limits by regulator


**Contaminant:** PFAS Total

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 0,50

**Unit:** μg/l

**Limit type:** Parametric value

> PFAS Total | 0,50 | μg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

PFAS Total — Drinking water contaminant limits by regulator


**Contaminant:** Polycyclic aromatic hydrocarbons

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 0,10

**Unit:** μg/l

**Limit type:** Parametric value

> Polycyclic aromatic hydrocarbons | 0,10 | μg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Polycyclic aromatic hydrocarbons — Drinking water contaminant limits by regulator


**Contaminant:** Selenium

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 20

**Unit:** μg/l

**Limit type:** Parametric value

> Selenium | 20 | μg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Selenium — Drinking water contaminant limits by regulator


**Contaminant:** Sodium

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 200

**Unit:** mg/l

**Limit type:** Indicator parameter

> Sodium | 200 | mg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Sodium — Drinking water contaminant limits by regulator


**Contaminant:** Sulphate

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 250

**Unit:** mg/l

**Limit type:** Indicator parameter

> Sulphate | 250 | mg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Sulphate — Drinking water contaminant limits by regulator


**Contaminant:** Sum of PFAS

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 0,10

**Unit:** μg/l

**Limit type:** Parametric value

> Sum of PFAS | 0,10 | μg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Sum of PFAS — Drinking water contaminant limits by regulator


**Contaminant:** Tetrachloroethene and Trichloroethene

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 10

**Unit:** μg/l

**Limit type:** Parametric value

> Tetrachloroethene and Trichloroethene | 10 | μg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Tetrachloroethene and Trichloroethene — Drinking water contaminant limits by regulator


**Contaminant:** Trihalomethanes Total

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 100

**Unit:** μg/l

**Limit type:** Parametric value

> Trihalomethanes Total | 100 | μg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Trihalomethanes Total — Drinking water contaminant limits by regulator


**Contaminant:** Uranium

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 30

**Unit:** μg/l

**Limit type:** Parametric value

> Uranium | 30 | μg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Uranium — Drinking water contaminant limits by regulator


**Contaminant:** Vinyl chloride

**Regulator:** European Union (Directive 2020/2184)

**Limit:** 0,50

**Unit:** μg/l

**Limit type:** Parametric value

> Vinyl chloride | 0,50 | μg/l

Source: <https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32020L2184>

Vinyl chloride — Drinking water contaminant limits by regulator


**Contaminant:** 1, 2 dichloroethane

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 3.0

**Unit:** µg/1

**Limit type:** Prescribed concentration or value (maximum)

> 1, 2 dichloroethane | 3.0 | µg/1 |

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

1, 2 dichloroethane — Drinking water contaminant limits by regulator


**Contaminant:** Acrylamide

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 0.10

**Unit:** µg/1

**Limit type:** Prescribed concentration or value (maximum)

> Acrylamide | 0.10 | µg/1

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Acrylamide — Drinking water contaminant limits by regulator


**Contaminant:** Aluminium

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 200

**Unit:** µgA1/1

**Limit type:** Prescribed concentration or value (maximum)

> Aluminium | 200 | µgA1/1 |

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Aluminium — Drinking water contaminant limits by regulator


**Contaminant:** Antimony

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 5.0

**Unit:** µgSb/1

**Limit type:** Prescribed concentration or value (maximum)

> Antimony | 5.0 | µgSb/1 |

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Antimony — Drinking water contaminant limits by regulator


**Contaminant:** Arsenic

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 10

**Unit:** µgAs/1

**Limit type:** Prescribed concentration or value (maximum)

> Arsenic | 10 | µgAs/1 |

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Arsenic — Drinking water contaminant limits by regulator


**Contaminant:** Benzene

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 1.0

**Unit:** µg/1

**Limit type:** Prescribed concentration or value (maximum)

> Benzene | 1.0 | µg/1 |

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Benzene — Drinking water contaminant limits by regulator


**Contaminant:** Benzo(a)pyrene

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 0.010

**Unit:** µg/1

**Limit type:** Prescribed concentration or value (maximum)

> Benzo(a)pyrene | 0.010 | µg/1 |

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Benzo(a)pyrene — Drinking water contaminant limits by regulator


**Contaminant:** Boron

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 1.0

**Unit:** mgB/1

**Limit type:** Prescribed concentration or value (maximum)

> Boron | 1.0 | mgB/1 |

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Boron — Drinking water contaminant limits by regulator


**Contaminant:** Bromate

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 10

**Unit:** µgBrO3/1

**Limit type:** Prescribed concentration or value (maximum)

> Bromate | 10 | µgBrO3/1 |

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Bromate — Drinking water contaminant limits by regulator


**Contaminant:** Cadmium

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 5.0

**Unit:** µgCd/1

**Limit type:** Prescribed concentration or value (maximum)

> Cadmium | 5.0 | µgCd/1 |

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Cadmium — Drinking water contaminant limits by regulator


**Contaminant:** Chromium

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 50

**Unit:** µgCr/1

**Limit type:** Prescribed concentration or value (maximum)

> Chromium | 50 | µgCr/1 |

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Chromium — Drinking water contaminant limits by regulator


**Contaminant:** Coliform bacteria

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 0

**Unit:** number/100ml

**Limit type:** Prescribed concentration or value (maximum)

> Coliform bacteria | 0 | number/100ml | Service reservoirs

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Coliform bacteria — Drinking water contaminant limits by regulator


**Contaminant:** Colour

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 20

**Unit:** mg/1 Pt/Co

**Limit type:** Prescribed concentration or value (maximum)

> Colour | 20 | mg/1 Pt/Co |

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Colour — Drinking water contaminant limits by regulator


**Contaminant:** Copper

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 2.0

**Unit:** mgCu/1

**Limit type:** Prescribed concentration or value (maximum)

> Copper | 2.0 | mgCu/1 |

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Copper — Drinking water contaminant limits by regulator


**Contaminant:** Cyanide

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 50

**Unit:** µgCN/1

**Limit type:** Prescribed concentration or value (maximum)

> Cyanide | 50 | µgCN/1 |

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Cyanide — Drinking water contaminant limits by regulator


**Contaminant:** Enterococci

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 0

**Unit:** number/100ml

**Limit type:** Prescribed concentration or value (maximum)

> Enterococci | 0 | number/100ml |

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Enterococci — Drinking water contaminant limits by regulator


**Contaminant:** Epichlorohydrin

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 0.10

**Unit:** µg/1

**Limit type:** Prescribed concentration or value (maximum)

> Epichlorohydrin | 0.10 | µg/1

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Epichlorohydrin — Drinking water contaminant limits by regulator


**Contaminant:** Escherichia coli (E. coli)

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 0

**Unit:** number/100ml

**Limit type:** Prescribed concentration or value (maximum)

> Escherichia coli (E. coli) | 0 | number/100ml |

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Escherichia coli (E. coli) — Drinking water contaminant limits by regulator


**Contaminant:** Fluoride

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 1.5

**Unit:** mgF/1

**Limit type:** Prescribed concentration or value (maximum)

> Fluoride | 1.5 | mgF/1 |

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Fluoride — Drinking water contaminant limits by regulator


**Contaminant:** Iron

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 200

**Unit:** µgFe/1

**Limit type:** Prescribed concentration or value (maximum)

> Iron | 200 | µgFe/1 |

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Iron — Drinking water contaminant limits by regulator


**Contaminant:** Lead

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 10

**Unit:** µgPb/1

**Limit type:** Prescribed concentration or value (maximum)

> Lead | 10 | µgPb/1 |

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Lead — Drinking water contaminant limits by regulator


**Contaminant:** Manganese

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 50

**Unit:** µgMn/1

**Limit type:** Prescribed concentration or value (maximum)

> Manganese | 50 | µgMn/1 |

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Manganese — Drinking water contaminant limits by regulator


**Contaminant:** Mercury

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 1.0

**Unit:** µgHg/1

**Limit type:** Prescribed concentration or value (maximum)

> Mercury | 1.0 | µgHg/1 |

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Mercury — Drinking water contaminant limits by regulator


**Contaminant:** Nickel

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 20

**Unit:** µgNi/1

**Limit type:** Prescribed concentration or value (maximum)

> Nickel | 20 | µgNi/1 |

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Nickel — Drinking water contaminant limits by regulator


**Contaminant:** Nitrate

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 50

**Unit:** mgNO3/1

**Limit type:** Prescribed concentration or value (maximum)

> Nitrate (ii) | 50 | mgNO3/1 |

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Nitrate — Drinking water contaminant limits by regulator


**Contaminant:** Nitrite

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 0.50

**Unit:** mgNO2/1

**Limit type:** Prescribed concentration or value (maximum)

> Nitrite (ii) | 0.50 | mgNO2/1 |

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Nitrite — Drinking water contaminant limits by regulator


**Contaminant:** Other pesticides

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 0.10

**Unit:** μg/l

**Limit type:** Prescribed concentration or value (maximum)

> Other pesticides | 0.10 | μg/l |

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Other pesticides — Drinking water contaminant limits by regulator


**Contaminant:** Pesticides (Aldrin, Dieldrin, Heptachlor, Heptachlor epoxide)

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 0.030

**Unit:** µg/1

**Limit type:** Prescribed concentration or value (maximum)

> Pesticides (iii) (iv) | 0.030 | µg/1 | Consumers’ taps | | Aldrin

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Pesticides (Aldrin, Dieldrin, Heptachlor, Heptachlor epoxide) — Drinking water contaminant limits by regulator


**Contaminant:** Pesticides: total

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 0.50

**Unit:** µg/1

**Limit type:** Prescribed concentration or value (maximum)

> Pesticides: total (v) | 0.50 | µg/1 |

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Pesticides: total — Drinking water contaminant limits by regulator


**Contaminant:** Polycyclic aromatic hydrocarbon

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 0.10

**Unit:** µg/1

**Limit type:** Prescribed concentration or value (maximum)

> µg/1 | Consumers’ taps | 22. | Polycyclic aromatic hydrocarbon (vi) | 0.10 |

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Polycyclic aromatic hydrocarbon — Drinking water contaminant limits by regulator


**Contaminant:** Selenium

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 10

**Unit:** µgSe/1

**Limit type:** Prescribed concentration or value (maximum)

> Selenium | 10 | µgSe/1 |

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Selenium — Drinking water contaminant limits by regulator


**Contaminant:** Sodium

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 200

**Unit:** mgNa/1

**Limit type:** Prescribed concentration or value (maximum)

> Sodium | 200 | mgNa/1 |

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Sodium — Drinking water contaminant limits by regulator


**Contaminant:** Tetrachloroethene and Trichloroethene

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 10

**Unit:** μg/l

**Limit type:** Prescribed concentration or value (maximum)

> 10 | µgSe/1 | Consumers’ taps | 24. | Tetrachloroethene and Trichloroethene (vii) | 10 | μg/l |

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Tetrachloroethene and Trichloroethene — Drinking water contaminant limits by regulator


**Contaminant:** Tetrachloromethane

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 3

**Unit:** µg/1

**Limit type:** Prescribed concentration or value (maximum)

> Tetrachloromethane | 3 | µg/1 |

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Tetrachloromethane — Drinking water contaminant limits by regulator


**Contaminant:** Trihalomethanes: Total

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 100

**Unit:** µg/1

**Limit type:** Prescribed concentration or value (maximum)

> Trihalomethanes: Total (viii) | 100 | µg/1 |

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Trihalomethanes: Total — Drinking water contaminant limits by regulator


**Contaminant:** Turbidity

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 4

**Unit:** NTU

**Limit type:** Prescribed concentration or value (maximum)

> Turbidity | 4 | NTU |

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Turbidity — Drinking water contaminant limits by regulator


**Contaminant:** Vinyl chloride

**Regulator:** United Kingdom (SI 2016/614)

**Limit:** 0.50

**Unit:** µg/1

**Limit type:** Prescribed concentration or value (maximum)

> Vinyl chloride | 0.50 | µg/1

Source: <https://www.legislation.gov.uk/uksi/2016/614/schedule/1/made>

Vinyl chloride — Drinking water contaminant limits by regulator


**Contaminant:** 1,1,1-Trichloroethane

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.2

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> 1,1,1-Trichloroethane | 0.20 | 0.2

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

1,1,1-Trichloroethane — Drinking water contaminant limits by regulator


**Contaminant:** 1,1,2-Trichloroethane

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.005

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> 1,1,2-Trichloroethane | 0.003 | 0.005

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

1,1,2-Trichloroethane — Drinking water contaminant limits by regulator


**Contaminant:** 1,1-Dichloroethylene

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.007

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> 1,1-Dichloroethylene | 0.007 | 0.007

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

1,1-Dichloroethylene — Drinking water contaminant limits by regulator


**Contaminant:** 1,2,4-Trichlorobenzene

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.07

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> 1,2,4-Trichlorobenzene | 0.07 | 0.07

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

1,2,4-Trichlorobenzene — Drinking water contaminant limits by regulator


**Contaminant:** 1,2-Dibromo-3-chloropropane (DBCP)

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.0002

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> 1,2-Dibromo-3-chloropropane ( DBCP ) | zero | 0.0002

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

1,2-Dibromo-3-chloropropane (DBCP) — Drinking water contaminant limits by regulator


**Contaminant:** 1,2-Dichloroethane

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.005

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> 1,2-Dichloroethane | zero | 0.005

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

1,2-Dichloroethane — Drinking water contaminant limits by regulator


**Contaminant:** 1,2-Dichloropropane

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.005

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> 1,2-Dichloropropane | zero | 0.005

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

1,2-Dichloropropane — Drinking water contaminant limits by regulator


**Contaminant:** 2,4,5-TP (Silvex)

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.05

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> 2,4,5-TP ( Silvex ) | 0.05 | 0.05

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

2,4,5-TP (Silvex) — Drinking water contaminant limits by regulator


**Contaminant:** 2,4-D

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.07

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> 2,4-D | 0.07 | 0.07

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

2,4-D — Drinking water contaminant limits by regulator


**Contaminant:** Acrylamide

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** TT

**Limit type:** Treatment Technique

> Acrylamide | zero | TT 8

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Acrylamide — Drinking water contaminant limits by regulator


**Contaminant:** Alachlor

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.002

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Alachlor | zero | 0.002

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Alachlor — Drinking water contaminant limits by regulator


**Contaminant:** Alpha particles

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 15 picocuries per Liter (pCi/L)

**Unit:** pCi/L

**Limit type:** MCL (Maximum Contaminant Level)

> Alpha particles | none ---------- zero | 15 picocuries per Liter ( pCi/L )

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Alpha particles — Drinking water contaminant limits by regulator


**Contaminant:** Antimony

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.006

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Antimony | 0.006 | 0.006

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Antimony — Drinking water contaminant limits by regulator


**Contaminant:** Arsenic

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.010 as of 01/23/06

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> MCL or TT 1 ( mg/L ) 2 | Potential Health Effects from Long-Term Exposure Above the MCL (unless specified as short-term) | Sources of Contaminant in Drinking Water | Antimony | 0.006 | 0.006 | Increase in blood cholesterol; decrease in blood sugar | Discharge from petroleum refineries; fire retardants; ceramics; electronics; solder | Arsenic <http://nepis.epa.gov/Exe/ZyPDF.cgi?Dockey=300065YM.txt> Quick reference guide <http://nepis.epa.gov/Exe/ZyPDF.cgi?Dockey=60000E1E.txt> Consumer fact sheet | 0 | 0.010 as of 01/23/06 |

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Arsenic — Drinking water contaminant limits by regulator


**Contaminant:** Asbestos (fiber > 10 micrometers)

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 7 MFL

**Unit:** MFL

**Limit type:** MCL (Maximum Contaminant Level)

> Asbestos (fiber > 10 micrometers) | 7 million fibers per liter ( MFL ) | 7 MFL

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Asbestos (fiber > 10 micrometers) — Drinking water contaminant limits by regulator


**Contaminant:** Atrazine

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.003

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Atrazine | 0.003 | 0.003

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Atrazine — Drinking water contaminant limits by regulator


**Contaminant:** Barium

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 2

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Barium | 2 | 2

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Barium — Drinking water contaminant limits by regulator


**Contaminant:** Benzene

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.005

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Benzene | zero | 0.005

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Benzene — Drinking water contaminant limits by regulator


**Contaminant:** Benzo(a)pyrene (PAHs)

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.0002

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Benzo(a)pyrene (PAHs) | zero | 0.0002

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Benzo(a)pyrene (PAHs) — Drinking water contaminant limits by regulator


**Contaminant:** Beryllium

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.004

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Beryllium | 0.004 | 0.004

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Beryllium — Drinking water contaminant limits by regulator


**Contaminant:** Beta particles and photon emitters

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 4 millirems per year

**Unit:** millirems per year

**Limit type:** MCL (Maximum Contaminant Level)

> Beta particles and photon emitters | none ---------- zero | 4 millirems per year

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Beta particles and photon emitters — Drinking water contaminant limits by regulator


**Contaminant:** Bromate

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.010

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Bromate | zero | 0.010

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Bromate — Drinking water contaminant limits by regulator


**Contaminant:** Cadmium

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.005

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Cadmium | 0.005 | 0.005

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Cadmium — Drinking water contaminant limits by regulator


**Contaminant:** Carbofuran

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.04

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Carbofuran | 0.04 | 0.04

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Carbofuran — Drinking water contaminant limits by regulator


**Contaminant:** Carbon tetrachloride

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.005

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Carbon tetrachloride | zero | 0.005

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Carbon tetrachloride — Drinking water contaminant limits by regulator


**Contaminant:** Chloramines (as Cl2)

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** MRDL=4.0

**Unit:** mg/L

**Limit type:** MRDL (Maximum Residual Disinfectant Level)

> Chloramines (as Cl 2 ) | MRDLG =4 1 | MRDL =4.0 1

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Chloramines (as Cl2) — Drinking water contaminant limits by regulator


**Contaminant:** Chlordane

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.002

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Chlordane | zero | 0.002

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Chlordane — Drinking water contaminant limits by regulator


**Contaminant:** Chlorine (as Cl2)

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** MRDL=4.0

**Unit:** mg/L

**Limit type:** MRDL (Maximum Residual Disinfectant Level)

> Chlorine (as Cl 2 ) | MRDLG =4 1 | MRDL =4.0 1

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Chlorine (as Cl2) — Drinking water contaminant limits by regulator


**Contaminant:** Chlorine dioxide (as ClO2)

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** MRDL=0.8

**Unit:** mg/L

**Limit type:** MRDL (Maximum Residual Disinfectant Level)

> Chlorine dioxide (as ClO 2 ) | MRDLG =0.8 1 | MRDL =0.8 1

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Chlorine dioxide (as ClO2) — Drinking water contaminant limits by regulator


**Contaminant:** Chlorite

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 1.0

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Chlorite | 0.8 | 1.0

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Chlorite — Drinking water contaminant limits by regulator


**Contaminant:** Chlorobenzene

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.1

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Chlorobenzene | 0.1 | 0.1

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Chlorobenzene — Drinking water contaminant limits by regulator


**Contaminant:** Chromium (total)

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.1

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Chromium (total) | 0.1 | 0.1

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Chromium (total) — Drinking water contaminant limits by regulator


**Contaminant:** cis-1,2-Dichloroethylene

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.07

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> cis-1,2-Dichloroethylene | 0.07 | 0.07

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

cis-1,2-Dichloroethylene — Drinking water contaminant limits by regulator


**Contaminant:** Copper

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** TT; Action Level=1.3

**Unit:** mg/L

**Limit type:** Treatment Technique

> Copper | 1.3 | TT 7 ; Action Level=1.3

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Copper — Drinking water contaminant limits by regulator


**Contaminant:** Cryptosporidium

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** TT

**Limit type:** Treatment Technique

> Cryptosporidium | zero | TT 3

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Cryptosporidium — Drinking water contaminant limits by regulator


**Contaminant:** Cyanide (as free cyanide)

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.2

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Cyanide (as free cyanide) | 0.2 | 0.2

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Cyanide (as free cyanide) — Drinking water contaminant limits by regulator


**Contaminant:** Dalapon

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.2

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Dalapon | 0.2 | 0.2

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Dalapon — Drinking water contaminant limits by regulator


**Contaminant:** Di(2-ethylhexyl) adipate

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.4

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Di(2-ethylhexyl) adipate | 0.4 | 0.4

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Di(2-ethylhexyl) adipate — Drinking water contaminant limits by regulator


**Contaminant:** Di(2-ethylhexyl) phthalate

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.006

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Di(2-ethylhexyl) phthalate | zero | 0.006

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Di(2-ethylhexyl) phthalate — Drinking water contaminant limits by regulator


**Contaminant:** Dichloromethane

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.005

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Dichloromethane | zero | 0.005

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Dichloromethane — Drinking water contaminant limits by regulator


**Contaminant:** Dinoseb

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.007

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Dinoseb | 0.007 | 0.007

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Dinoseb — Drinking water contaminant limits by regulator


**Contaminant:** Dioxin (2,3,7,8-TCDD)

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.00000003

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Dioxin ( 2,3,7,8-TCDD ) | zero | 0.00000003

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Dioxin (2,3,7,8-TCDD) — Drinking water contaminant limits by regulator


**Contaminant:** Diquat

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.02

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Diquat | 0.02 | 0.02

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Diquat — Drinking water contaminant limits by regulator


**Contaminant:** Endothall

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.1

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Endothall | 0.1 | 0.1

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Endothall — Drinking water contaminant limits by regulator


**Contaminant:** Endrin

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.002

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Endrin | 0.002 | 0.002

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Endrin — Drinking water contaminant limits by regulator


**Contaminant:** Epichlorohydrin

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** TT

**Limit type:** Treatment Technique

> Epichlorohydrin | zero | TT 8

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Epichlorohydrin — Drinking water contaminant limits by regulator


**Contaminant:** Ethylbenzene

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.7

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Ethylbenzene | 0.7 | 0.7

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Ethylbenzene — Drinking water contaminant limits by regulator


**Contaminant:** Ethylene dibromide

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.00005

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Ethylene dibromide | zero | 0.00005

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Ethylene dibromide — Drinking water contaminant limits by regulator


**Contaminant:** Fluoride

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 4.0

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Fluoride | 4.0 | 4.0

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Fluoride — Drinking water contaminant limits by regulator


**Contaminant:** Giardia lamblia

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** TT

**Limit type:** Treatment Technique

> Giardia lamblia | zero | TT 3

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Giardia lamblia — Drinking water contaminant limits by regulator


**Contaminant:** Glyphosate

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.7

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Glyphosate | 0.7 | 0.7

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Glyphosate — Drinking water contaminant limits by regulator


**Contaminant:** Haloacetic acids (HAA5)

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.060

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Haloacetic acids ( HAA5) | n/a 6 | 0.060

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Haloacetic acids (HAA5) — Drinking water contaminant limits by regulator


**Contaminant:** Hazard Index PFAS (HFPO-DA, PFBS, PFHxS, and PFNA)

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 1(unitless)

**Unit:** unitless

**Limit type:** MCL (Maximum Contaminant Level)

> Hazard Index PFAS (HFPO-DA, PFBS, PFHxS, and PFNA) | 1(unitless) | 1(unitless)

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Hazard Index PFAS (HFPO-DA, PFBS, PFHxS, and PFNA) — Drinking water contaminant limits by regulator


**Contaminant:** Heptachlor epoxide

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.0002

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Heptachlor epoxide | zero | 0.0002

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Heptachlor epoxide — Drinking water contaminant limits by regulator


**Contaminant:** Heptachlor

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.0004

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Heptachlor | zero | 0.0004

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Heptachlor — Drinking water contaminant limits by regulator


**Contaminant:** Heterotrophic plate count (HPC)

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** TT

**Limit type:** Treatment Technique

> Heterotrophic plate count ( HPC ) | n/a | TT 3

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Heterotrophic plate count (HPC) — Drinking water contaminant limits by regulator


**Contaminant:** Hexachlorobenzene

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.001

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Hexachlorobenzene | zero | 0.001

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Hexachlorobenzene — Drinking water contaminant limits by regulator


**Contaminant:** Hexachlorocyclopentadiene

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.05

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Hexachlorocyclopentadiene | 0.05 | 0.05

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Hexachlorocyclopentadiene — Drinking water contaminant limits by regulator


**Contaminant:** HFPO-DA (commonly known as GenX Chemicals)

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 10 ppt

**Unit:** ppt

**Limit type:** MCL (Maximum Contaminant Level)

> HFPO-DA (commonly known as GenX Chemicals) | 10 ppt | 10 ppt

Source: <https://www.epa.gov/sdwa/and-polyfluoroalkyl-substances-pfas>

HFPO-DA (commonly known as GenX Chemicals) — Drinking water contaminant limits by regulator


**Contaminant:** HFPO-DA (commonly knowns as GenX Chemicals)

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.00001

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> HFPO-DA (commonly knowns as GenX Chemicals) | 0.00001 | 0.00001

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

HFPO-DA (commonly knowns as GenX Chemicals) — Drinking water contaminant limits by regulator


**Contaminant:** Lead

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** TT; Action Level=0.010

**Unit:** mg/L

**Limit type:** Treatment Technique

> monochloroacetic acid (0.07 mg/L ). Bromoacetic acid and dibromoacetic acid are regulated with this group but have no MCLGs. 7 Lead and copper are regulated by a treatment technique that requires systems to control the corrosiveness of their water.

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Lead — Drinking water contaminant limits by regulator


**Contaminant:** Legionella

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** TT

**Limit type:** Treatment Technique

> Legionella | zero | TT 3

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Legionella — Drinking water contaminant limits by regulator


**Contaminant:** Lindane

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.0002

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Lindane | 0.0002 | 0.0002

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Lindane — Drinking water contaminant limits by regulator


**Contaminant:** Mercury (inorganic)

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.002

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Mercury (inorganic) | 0.002 | 0.002

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Mercury (inorganic) — Drinking water contaminant limits by regulator


**Contaminant:** Methoxychlor

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.04

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Methoxychlor | 0.04 | 0.04

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Methoxychlor — Drinking water contaminant limits by regulator


**Contaminant:** Mixtures containing two or more of PFHxS, PFNA, HFPO-DA, and PFBS

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 1 (unitless) Hazard Index

**Unit:** unitless

**Limit type:** MCL (Maximum Contaminant Level)

> Mixtures containing two or more of PFHxS, PFNA, HFPO-DA, and PFBS | 1 (unitless) Hazard Index | 1 (unitless) Hazard Index

Source: <https://www.epa.gov/sdwa/and-polyfluoroalkyl-substances-pfas>

Mixtures containing two or more of PFHxS, PFNA, HFPO-DA, and PFBS — Drinking water contaminant limits by regulator


**Contaminant:** Nitrate (measured as Nitrogen)

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 10

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Nitrate (measured as Nitrogen) | 10 | 10

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Nitrate (measured as Nitrogen) — Drinking water contaminant limits by regulator


**Contaminant:** Nitrite (measured as Nitrogen)

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 1

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Nitrite (measured as Nitrogen) | 1 | 1

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Nitrite (measured as Nitrogen) — Drinking water contaminant limits by regulator


**Contaminant:** o-Dichlorobenzene

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.6

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> o-Dichlorobenzene | 0.6 | 0.6

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

o-Dichlorobenzene — Drinking water contaminant limits by regulator


**Contaminant:** Oxamyl (Vydate)

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.2

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Oxamyl (Vydate) | 0.2 | 0.2

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Oxamyl (Vydate) — Drinking water contaminant limits by regulator


**Contaminant:** p-Dichlorobenzene

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.075

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> p-Dichlorobenzene | 0.075 | 0.075

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

p-Dichlorobenzene — Drinking water contaminant limits by regulator


**Contaminant:** Pentachlorophenol

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.001

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Pentachlorophenol | zero | 0.001

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Pentachlorophenol — Drinking water contaminant limits by regulator


**Contaminant:** PFBS

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** No individual MCL

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> PFBS | No individual MCLG | No individual MCL

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

PFBS — Drinking water contaminant limits by regulator


**Contaminant:** PFHxS

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 10 ppt

**Unit:** ppt

**Limit type:** MCL (Maximum Contaminant Level)

> PFHxS | 10 ppt | 10 ppt

Source: <https://www.epa.gov/sdwa/and-polyfluoroalkyl-substances-pfas>

PFHxS — Drinking water contaminant limits by regulator


**Contaminant:** PFHxS

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.00001

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> PFHxS | 0.00001 | 0.00001

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>


**Contaminant:** PFNA

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 10 ppt

**Unit:** ppt

**Limit type:** MCL (Maximum Contaminant Level)

> PFNA | 10 ppt | 10 ppt

Source: <https://www.epa.gov/sdwa/and-polyfluoroalkyl-substances-pfas>

PFNA — Drinking water contaminant limits by regulator


**Contaminant:** PFNA

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.00001

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> PFNA | 0.00001 | 0.00001

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>


**Contaminant:** PFOA

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 4.0 parts per trillion (ppt)

**Unit:** ppt

**Limit type:** MCL (Maximum Contaminant Level)

> PFOA | Zero | 4.0 parts per trillion (ppt) (also expressed as ng/L)

Source: <https://www.epa.gov/sdwa/and-polyfluoroalkyl-substances-pfas>

PFOA — Drinking water contaminant limits by regulator


**Contaminant:** PFOA

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.0000040

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> PFOA | zero | 0.0000040

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>


**Contaminant:** PFOS

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 4.0 ppt

**Unit:** ppt

**Limit type:** MCL (Maximum Contaminant Level)

> PFOS | Zero | 4.0 ppt

Source: <https://www.epa.gov/sdwa/and-polyfluoroalkyl-substances-pfas>

PFOS — Drinking water contaminant limits by regulator


**Contaminant:** PFOS

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.0000040

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> PFOS | zero | 0.0000040

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>


**Contaminant:** Picloram

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.5

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Picloram | 0.5 | 0.5

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Picloram — Drinking water contaminant limits by regulator


**Contaminant:** Polychlorinated biphenyls (PCBs)

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.0005

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Polychlorinated biphenyls ( PCBs ) | zero | 0.0005

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Polychlorinated biphenyls (PCBs) — Drinking water contaminant limits by regulator


**Contaminant:** Radium 226 and Radium 228 (combined)

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 5 pCi/L

**Unit:** pCi/L

**Limit type:** MCL (Maximum Contaminant Level)

> Radium 226 and Radium 228 (combined) | none ---------- zero | 5 pCi/L

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Radium 226 and Radium 228 (combined) — Drinking water contaminant limits by regulator


**Contaminant:** Selenium

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.05

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Selenium | 0.05 | 0.05

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Selenium — Drinking water contaminant limits by regulator


**Contaminant:** Simazine

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.004

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Simazine | 0.004 | 0.004

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Simazine — Drinking water contaminant limits by regulator


**Contaminant:** Styrene

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.1

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Styrene | 0.1 | 0.1

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Styrene — Drinking water contaminant limits by regulator


**Contaminant:** Tetrachloroethylene

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.005

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Tetrachloroethylene | zero | 0.005

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Tetrachloroethylene — Drinking water contaminant limits by regulator


**Contaminant:** Thallium

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.002

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Thallium | 0.0005 | 0.002

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Thallium — Drinking water contaminant limits by regulator


**Contaminant:** Toluene

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 1

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Toluene | 1 | 1

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Toluene — Drinking water contaminant limits by regulator


**Contaminant:** Total Coliforms (including fecal coliform and E. Coli)

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 5.0%

**Unit:** %

**Limit type:** MCL (Maximum Contaminant Level)

> zero | 5.0% 4 | Not a health threat in itself; it is used to indicate whether other potentially harmful bacteria may be present

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Total Coliforms (including fecal coliform and E. Coli) — Drinking water contaminant limits by regulator


**Contaminant:** Total Trihalomethanes (TTHMs)

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.080

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Total Trihalomethanes ( TTHMs ) | n/a 6 | 0.080

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Total Trihalomethanes (TTHMs) — Drinking water contaminant limits by regulator


**Contaminant:** Toxaphene

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.003

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Toxaphene | zero | 0.003

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Toxaphene — Drinking water contaminant limits by regulator


**Contaminant:** trans-1,2-Dichloroethylene

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.1

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> trans-1,2-Dichloroethylene | 0.1 | 0.1

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

trans-1,2-Dichloroethylene — Drinking water contaminant limits by regulator


**Contaminant:** Trichloroethylene

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.005

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Trichloroethylene | zero | 0.005

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Trichloroethylene — Drinking water contaminant limits by regulator


**Contaminant:** Turbidity

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** TT

**Limit type:** Treatment Technique

> Turbidity | n/a | TT 3

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Turbidity — Drinking water contaminant limits by regulator


**Contaminant:** Uranium

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 30 ug/L as of 12/08/03

**Unit:** ug/L

**Limit type:** MCL (Maximum Contaminant Level)

> Uranium | zero | 30 ug/L as of 12/08/03

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Uranium — Drinking water contaminant limits by regulator


**Contaminant:** Vinyl chloride

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 0.002

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Vinyl chloride | zero | 0.002

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Vinyl chloride — Drinking water contaminant limits by regulator


**Contaminant:** Viruses (enteric)

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** TT

**Limit type:** Treatment Technique

> Viruses (enteric) | zero | TT 3

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Viruses (enteric) — Drinking water contaminant limits by regulator


**Contaminant:** Xylenes (total)

**Regulator:** US EPA (National Primary Drinking Water Regulations)

**Limit:** 10

**Unit:** mg/L

**Limit type:** MCL (Maximum Contaminant Level)

> Xylenes (total) | 10 | 10

Source: <https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations>

Xylenes (total) — Drinking water contaminant limits by regulator