PFAS drinking water concentration limits by US state — MCLs, notification levels, action levels, and health advisories for PFOA, PFOS, and other per- and polyfluoroalkyl substances

State-by-state comparison of legally enforceable and advisory concentration limits for PFAS compounds in drinking water. Each record is one state–chemical pair with the concentration limit (in parts per trillion), the regulation type (MCL, notification level, action level, health advisory, or guideline), the effective date, the statutory or regulatory citation, and whether the state limit is stricter than the federal EPA MCL. The federal MCLs are 4 ppt for PFOA and PFOS (affirmed May 2025); MCLs for PFHxS, PFNA, and HFPO-DA are under proposed rescission as of May 2026. State limits range from 0.00266 ppt (Nevada, PFOA) to 400,000 ppt (Michigan, PFHxA). Answers 'what is the legal PFAS limit in my state', 'is my state stricter than the federal standard', and 'which PFAS compounds does my state regulate'.

Records100

Sources2

Verified2026-08-14

Review by2027-02-10

Licenceunknown

The data

State–chemical pair	State	PFAS compound	Concentration limit (ppt)	Regulation type	Stricter than federal MCL	Regulatory citation	Effective date
Alaska — PFOS, PFOA, PFNA, PFHxS, and PFHpA combined	Alaska	PFOS, PFOA, PFNA, PFHxS, and PFHpA combined	70	action level	n/a	Alaska DOT&PF Action Level
California — PFBS	California	PFBS	500	notification level	n/a	California Health & Safety Code § 116378
California — PFHxS	California	PFHxS	3	notification level	yes	California Health & Safety Code § 116378
California — PFOA	California	PFOA	4	notification level	no	California Health & Safety Code § 116378
California — PFOS	California	PFOS	4	notification level	no	California Health & Safety Code § 116378
Colorado — PFBS	Colorado	PFBS	400,000	guideline	n/a	Colorado Translation Level
Colorado — PFHxS	Colorado	PFHxS	700	guideline	no	Colorado Translation Level
Colorado — PFOS, PFOA, and PFNA combined	Colorado	PFOS, PFOA, and PFNA combined	70	guideline	n/a	Colorado Translation Level
Connecticut — 6:2 chloropolyfluoroether sulfonic acid	Connecticut	6:2 chloropolyfluoroether sulfonic acid	2	action level	n/a
Connecticut — 8:2 chloropolyfluoroether sulfonic acid	Connecticut	8:2 chloropolyfluoroether sulfonic acid	5	action level	n/a
Connecticut — HFPO-DA	Connecticut	HFPO-DA	19	action level	no
Connecticut — PFBA	Connecticut	PFBA	1,800	action level	n/a
Connecticut — PFBS	Connecticut	PFBS	760	action level	n/a
Connecticut — PFHxA	Connecticut	PFHxA	240	action level	n/a
Connecticut — PFHxS	Connecticut	PFHxS	49	action level	no
Connecticut — PFNA	Connecticut	PFNA	12	action level	no
Connecticut — PFOA	Connecticut	PFOA	16	action level	no
Connecticut — PFOS	Connecticut	PFOS	10	action level	no
Delaware — PFHxS, PFNA, and Gen X	Delaware	PFHxS, PFNA, and Gen X	10	MCL	no	Delaware PFAS Action Plan
Delaware — PFOS and PFOA	Delaware	PFOS and PFOA	4	MCL	no	Delaware PFAS Action Plan
Federal — HFPO-DA	Federal	HFPO-DA	10	MCL	n/a	PFAS National Primary Drinking Water Regulation, 89 FR 32532	2024-04-10
Federal — PFHxS	Federal	PFHxS	10	MCL	n/a	PFAS National Primary Drinking Water Regulation, 89 FR 32532	2024-04-10
Federal — PFHxS/PFNA/HFPO-DA/PFBS mixtures	Federal	PFHxS, PFNA, HFPO-DA, and PFBS mixtures	1 (Hazard Index)	MCL	n/a	PFAS National Primary Drinking Water Regulation, 89 FR 32532	2024-04-10
Federal — PFNA	Federal	PFNA	10	MCL	n/a	PFAS National Primary Drinking Water Regulation, 89 FR 32532	2024-04-10
Federal — PFOA	Federal	PFOA	4.0	MCL	n/a	PFAS National Primary Drinking Water Regulation, 89 FR 32532	2024-04-10
Federal — PFOS	Federal	PFOS	4.0	MCL	n/a	PFAS National Primary Drinking Water Regulation, 89 FR 32532	2024-04-10
Hawaii — 6:2 FTOH	Hawaii	6:2 FTOH	5,000	guideline	n/a	Hawaii Department of Health Environmental Action Levels (Table A)
Hawaii — 6:2 FTS	Hawaii	6:2 FTS	1,500	guideline	n/a	Hawaii Department of Health Environmental Action Levels (Table A)
Hawaii — 6:2 FTTAoS	Hawaii	6:2 FTTAoS	1,900	guideline	n/a	Hawaii Department of Health Environmental Action Levels (Table A)
Hawaii — 8:2 FTOH	Hawaii	8:2 FTOH	4,200	guideline	n/a	Hawaii Department of Health Environmental Action Levels (Table A)
Hawaii — ADONA	Hawaii	ADONA	1,200	guideline	n/a	Hawaii Department of Health Environmental Action Levels (Table A)
Hawaii — HFPO-DA	Hawaii	HFPO-DA	10	guideline	no	Hawaii Department of Health Environmental Action Levels (Table A)
Hawaii — PFBA	Hawaii	PFBA	15,000	guideline	n/a	Hawaii Department of Health Environmental Action Levels (Table A)
Hawaii — PFBS	Hawaii	PFBS	2,000	guideline	n/a	Hawaii Department of Health Environmental Action Levels (Table A)
Hawaii — PFDA	Hawaii	PFDA	7.7	guideline	n/a	Hawaii Department of Health Environmental Action Levels (Table A)
Hawaii — PFDoDA	Hawaii	PFDoDA	26	guideline	n/a	Hawaii Department of Health Environmental Action Levels (Table A)
Hawaii — PFDS	Hawaii	PFDS	38	guideline	n/a	Hawaii Department of Health Environmental Action Levels (Table A)
Hawaii — PFEtA	Hawaii	PFEtA	18,000	guideline	n/a	Hawaii Department of Health Environmental Action Levels (Table A)
Hawaii — PFHpA	Hawaii	PFHpA	77	guideline	n/a	Hawaii Department of Health Environmental Action Levels (Table A)
Hawaii — PFHpS	Hawaii	PFHpS	38	guideline	n/a	Hawaii Department of Health Environmental Action Levels (Table A)
Hawaii — PFHxA	Hawaii	PFHxA	1,900	guideline	n/a	Hawaii Department of Health Environmental Action Levels (Table A)
Hawaii — PFHxS	Hawaii	PFHxS	10	guideline	no	Hawaii Department of Health Environmental Action Levels (Table A)
Hawaii — PFNA	Hawaii	PFNA	10	guideline	no	Hawaii Department of Health Environmental Action Levels (Table A)
Hawaii — PFOA	Hawaii	PFOA	4	guideline	no	Hawaii Department of Health Environmental Action Levels (Table A)
Hawaii — PFOS	Hawaii	PFOS	4	guideline	no	Hawaii Department of Health Environmental Action Levels (Table A)
Hawaii — PFOSA	Hawaii	PFOSA	46	guideline	n/a	Hawaii Department of Health Environmental Action Levels (Table A)
Hawaii — PFPeA	Hawaii	PFPeA	1,500	guideline	n/a	Hawaii Department of Health Environmental Action Levels (Table A)
Hawaii — PFPeS	Hawaii	PFPeS	580	guideline	n/a	Hawaii Department of Health Environmental Action Levels (Table A)
Hawaii — PFPrA	Hawaii	PFPrA	510	guideline	n/a	Hawaii Department of Health Environmental Action Levels (Table A)
Hawaii — PFTeDA	Hawaii	PFTeDA	260	guideline	n/a	Hawaii Department of Health Environmental Action Levels (Table A)
Hawaii — PFTrDA	Hawaii	PFTrDA	26	guideline	n/a	Hawaii Department of Health Environmental Action Levels (Table A)
Hawaii — PFUnDA	Hawaii	PFUnDA	19	guideline	n/a	Hawaii Department of Health Environmental Action Levels (Table A)
Illinois — HFPO-DA	Illinois	HFPO-DA	10	guideline	no	35 IAC Part 620
Illinois — PFBS	Illinois	PFBS	2,000	guideline	n/a	35 IAC Part 620
Illinois — PFHxS	Illinois	PFHxS	10	guideline	no	35 IAC Part 620
Illinois — PFNA	Illinois	PFNA	10	guideline	no	35 IAC Part 620
Illinois — PFOA	Illinois	PFOA	4	guideline	no	35 IAC Part 620
Illinois — PFOS	Illinois	PFOS	4	guideline	no	35 IAC Part 620
Maine — PFOA, PFOS, PFHxS, PFNA, PFHpA, and PFDA combined	Maine	PFOA, PFOS, PFHxS, PFNA, PFHpA, and PFDA combined	20	notification level	n/a	Maine Interim Drinking Water Standard (SP0064)
Maryland — PFHxS	Maryland	PFHxS	140	health advisory	no	Maryland Department of Health PFHxS Advisory
Massachusetts — PFOA, PFOS, PFHxS, PFNA, PFHpA, and PFDA combined	Massachusetts	PFOA, PFOS, PFHxS, PFNA, PFHpA, and PFDA combined	20	MCL	n/a	310 CMR 22.00
Michigan — HFPO-DA	Michigan	HFPO-DA	370	MCL	no	Michigan PFAS Drinking Water Rules
Michigan — PFBS	Michigan	PFBS	420	MCL	n/a	Michigan PFAS Drinking Water Rules
Michigan — PFHxA	Michigan	PFHxA	400,000	MCL	n/a	Michigan PFAS Drinking Water Rules
Michigan — PFHxS	Michigan	PFHxS	51	MCL	no	Michigan PFAS Drinking Water Rules
Michigan — PFNA	Michigan	PFNA	6	MCL	yes	Michigan PFAS Drinking Water Rules
Michigan — PFOA	Michigan	PFOA	8	MCL	no	Michigan PFAS Drinking Water Rules
Michigan — PFOS	Michigan	PFOS	16	MCL	no	Michigan PFAS Drinking Water Rules
Minnesota — PFBA	Minnesota	PFBA	7,000	health advisory	n/a	Minnesota Department of Health Health Advisory
Minnesota — PFBS	Minnesota	PFBS	100	health advisory	n/a	Minnesota Department of Health Health Advisory
Minnesota — PFHxA	Minnesota	PFHxA	200	health advisory	n/a	Minnesota Department of Health Health Advisory
Minnesota — PFHxS	Minnesota	PFHxS	47	health advisory	no	Minnesota Department of Health Health Advisory
Minnesota — PFOA	Minnesota	PFOA	0.0079	health advisory	yes	Minnesota Department of Health Health Advisory
Minnesota — PFOS	Minnesota	PFOS	2.3	health advisory	yes	Minnesota Department of Health Health Advisory
Nevada — PFBS	Nevada	PFBS	10,000	guideline	n/a	Nevada Division of Environmental Protection Basic Comparison Levels
Nevada — PFOA (cancer risk)	Nevada	PFOA (cancer risk)	.00266	guideline	yes	Nevada Division of Environmental Protection Basic Comparison Levels
Nevada — PFOA (non-cancer risk)	Nevada	PFOA (non-cancer risk)	1.97	guideline	yes	Nevada Division of Environmental Protection Basic Comparison Levels
New Hampshire — PFHxS	New Hampshire	PFHxS	18	MCL	no	NH HB 1264 (2020)
New Hampshire — PFNA	New Hampshire	PFNA	11	MCL	no	NH HB 1264 (2020)
New Hampshire — PFOA	New Hampshire	PFOA	12	MCL	no	NH HB 1264 (2020)
New Hampshire — PFOS	New Hampshire	PFOS	15	MCL	no	NH HB 1264 (2020)
New Jersey — PFNA	New Jersey	PFNA	13	MCL	no	N.J.A.C. 7:10
New Jersey — PFOA	New Jersey	PFOA	14	MCL	no	N.J.A.C. 7:10
New Jersey — PFOS	New Jersey	PFOS	13	MCL	no	N.J.A.C. 7:10
New Mexico — PFOS, PFHxS, and PFOA combined	New Mexico	PFOS, PFHxS, and PFOA combined	70	guideline	n/a	20.6.2 NMAC Toxic Pollutant Standard
New York — PFOA and PFOS	New York	PFOA and PFOS	10	MCL	no	10 NYCRR Part 5, Subpart 5-1
North Carolina — HFPO-DA	North Carolina	HFPO-DA	10	health advisory	no	NC DHHS Health Advisory
Ohio — PFBS	Ohio	PFBS	2,000	guideline	n/a	Ohio PFAS Action Plan 2.0
Ohio — PFHxS, PFNA, and Gen X	Ohio	PFHxS, PFNA, and Gen X	10	guideline	no	Ohio PFAS Action Plan 2.0
Ohio — PFOS and PFOA	Ohio	PFOS and PFOA	4	guideline	no	Ohio PFAS Action Plan 2.0
Pennsylvania — PFOA	Pennsylvania	PFOA	14	MCL	no	25 Pa. Code Chapter 109
Pennsylvania — PFOS	Pennsylvania	PFOS	18	MCL	no	25 Pa. Code Chapter 109
Rhode Island — PFOA, PFOS, PFHxS, PFNA, PFHpA, and PFDA combined	Rhode Island	PFOA, PFOS, PFHxS, PFNA, PFHpA, and PFDA combined	20	notification level	n/a	RI General Laws Title 46, Chapter 32
Vermont — PFOA, PFOS, PFHpA, PFHxS, and PFNA combined	Vermont	PFOA, PFOS, PFHpA, PFHxS, and PFNA combined	20	MCL	n/a	Vermont Water Supply Rule	2020-03-17
Washington — PFBS	Washington	PFBS	345	notification level	n/a	WAC 246-290
Washington — PFHxS	Washington	PFHxS	65	notification level	no	WAC 246-290
Washington — PFNA	Washington	PFNA	9	notification level	yes	WAC 246-290
Washington — PFOA	Washington	PFOA	10	notification level	no	WAC 246-290
Washington — PFOS	Washington	PFOS	15	notification level	no	WAC 246-290
Wisconsin — PFOS and PFOA combined	Wisconsin	PFOS and PFOA combined	70	MCL	n/a	NR 809, Wisconsin Administrative Code

Where this came from

Every record above links the page it was taken from and quotes the sentence that states it. These are the 2 sources this dataset was assembled from.

bclplaw.comhttps://www.bclplaw.com/en-US/events-insights-news/pfas-drinking-water-standards-state-by-state-regulations.html
epa.govhttps://www.epa.gov/sdwa/and-polyfluoroalkyl-substances-pfas

Machine-readable

data.jsonThe whole dataset — every record with its source URL and source quote.
Open Knowledge Format bundleOne JSON object per line — every record's frontmatter and quoted span exactly as it is held here, in one fetch.
How this is made and checkedWhat "verified against source" does and does not mean.

100 records. last verified against source 2026-08-14. due for re-check by 2027-02-10.

Licence. unknown