# Arsenic — Drinking water contaminant limits by regulator

For Arsenic, regulator is US EPA (National Primary Drinking Water Regulations); limit is 0.010 as of 01/23/06; unit is mg/L; limit type is MCL (Maximum Contaminant Level), recorded from its source on 2026-08-06.

- **Contaminant:** Arsenic _(verified: appears in the quote below)_
- **Regulator:** US EPA (National Primary Drinking Water Regulations) _(our reading, not quoted from the source)_
- **Limit:** 0.010 as of 01/23/06 _(verified: appears in the quote below)_
- **Unit:** mg/L _(verified: appears in the quote below)_
- **Limit type:** MCL (Maximum Contaminant Level) _(our reading, not quoted from the source)_

## What the source says

> 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

Last verified: 2026-08-06. Review by: 2027-08-06.
Part of [Drinking water contaminant limits by regulator](https://referencesource.org/drinking-water-contaminant-limits/).