Drinking Water MCLs for PFAS Chemicals – State Comparison

Alabama

Follows federal

Code of Ala. § 22-23-33

ADEM Information for Public Water Systems PFAS

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

Alaska

Follows federal

18 AAC 80.300

DEC Maximum Contaminant Levels

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

Arizona

Follows federal

A.R.S. § 49-353(A)(2)(a)

18 A.A.C. 4

ADEQ Compliance Assistance: Current Drinking Water Rules

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

Arkansas

Follows federal

No state-specific requirements

8 CAR 21 (Rule 2)

ADH Drinking Water Safety

Arkansas Drinking Water Newsletters

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

California

Follows federal

State-specific guidance

HSC § 116378

California SWRB PFAS: Per- and Polyfluoroalkyl Substances

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

Non-enforceable Public Health Goals (PHGs):

PFOA: 0.007 ppt

PFOS: 1 ppt

Colorado

Follows federal with a compliance date of April 1, 2027

5 CCR 1002-11

CDPHE PFAS Rule

CWQ Policy 20-1

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

Connecticut

Follows federal

State-specific guidance

Connecticut SB 733

CT DPH PFAS — Information for Public Water Systems

CT DPH PFAS

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

Non-enforceable action levels:

PFOS: 10 ppt

PFOA: 16 ppt

Delaware

Follows federal

29 Del. C. § 8093 

Delaware SB 72

DNREC PFAS and Drinking Water

MCLs:

PFOA: 4 ppt 

PFOS: 4 ppt 

District of Columbia

Follows federal

No district-specific PFAS drinking water requirements

DC Water: PFAS and Drinking Water

MCLs:

PFOA: 4 ppt 

PFOS: 4 ppt 

Florida

Follows federal

No state-specific requirements

Fla. Stat. § 376.91

MCLs:

PFOA: 4 ppt 

PFOS: 4 ppt 

Georgia

Follows federal

No state-specific requirements

GA R&R 391-3-5

GEPD PFAS Information

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

Hawaii

Follows federal

State-specific guidance

HIDOH Per- and Polyfluoroalkyl Substances (PFASS) 

HIDOH Interim PFAS Guidance 

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

Idaho

Follows federal

IAC 58.01.08.050(02)

IDEQ PFAS and Idaho Drinking Water

IDHW PFAS in Drinking Water

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

Illinois

Follows federal

415 ILCS 47  

Illinois EPA Per- and Polyfluoroalkyl Substances (PFAS)

Illinois EPA 620 Groundwater Quality 

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

Indiana

Follows federal

No state-specific requirements

327 IAC 8-2

IDEM Per- and Polyfluoroalkyl Substances (PFAS): PFAS Activities in Indiana

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

Iowa

Follows federal

State-specific guidance

KAR 28-15a-61

KSA 65-171m

KDHE Public Water PFAS Monitoring Plan

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

Kentucky

Follows federal

No state-specific requirements

401 KAR 8:250 Section 1

Kentucky EEC PFAS

Kentucky EEC Drinking Water Compliance

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

Louisiana

Not currently following federal

No state-specific requirements

51 LAC XII-377

51 LAC XII-101

LDH PFAS

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

Maine

Follows federal

State-specific interim requirements

Maine DHHS Drinking Water Rule, 10-144 CMR Ch. 231

Interim MCLs: PFOA, PFOS, PFHxS, PFNA, PFHpA, and PFDA: 20 ppt (individually or combined)

MCLs (under development):

PFOA: 4 ppt

PFOS: 4 ppt

Maryland

Follows federal

No state-specific requirements

MDE PFAS in Maryland’s Drinking Water

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

Massachusetts

State-specific interim guidance

310 CMR 22.07G(3)

MassDEP PFAS Drinking Water Standard (MCL)

Interim MCLs: PFOA, PFOS, PFHxS, PFNA, PFHpA, and PFDA (combined): 20 ppt MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

Michigan

State-specific interim requirements

MAC R 325.10604g

Michigan EGLE MCLs for Drinking Water and Wells

Interim MCLs:

PFOA: 8 ppt

PFOS: 16 ppt

MCLs (effective by June 2029):

PFOA: 4 ppt

PFOS: 16 ppt

Minnesota

Follows federal

State-specific guidance

MAR 7050.0221

MDH PFAS and Health

MDH Comparison of State and Federal Drinking Water Standards

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

Non-enforceable HBVs:

PFOA: 0.0079 ppt

PFOS: 2.3 ppt

Mississippi

Follows federal

No state-specific requirements

15 MAC 20-72-1.2.3

MSDH Water Supply Regulations and Documents

MDEQ PFAS Information

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

Missouri

No state-specific requirements

10 CSR 20-7.031

RSMo 640.100 et. al.

MDNR PFAS Drinking Water Monitoring

Montana

Follows federal

No state-specific requirements

ARM 17.38.204

MDEQ Drinking Water Rules

MDEQ PFAS

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

Nebraska

Follows federal

No state-specific requirements

179 NAC 2-002.04B

Nebraska DWEE PFAS in Public Water Supply Systems

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

Nevada

Follows federal

No state-specific requirements

NAC 445A.4525

NDEP PFAS in Nevada

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

New Hampshire

State-specific-requirements

NH RSA 485:16-e

NHDES Drinking Water

MCLs:

PFOA: 12 ppt

PFOS: 15 ppt

New Jersey

State-specific requirements

N.J.A.C. 7:10-5.2

NJDEP PFAS Standards and Regulations

MCLs:

PFOA: 14 ppt

PFOS: 13 ppt

New Mexico

Follows federal

NMAC 20.7.10.100

NMED PFAS Water Regulations and Testing

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

New York

State-specific interim requirements

10 NYCCR 5-5.150 – 5.151

10 NYCCR 5-1.52

NYDH Public Water Systems and Drinking Water Standards for PFAS

Interim MCLs:

PFOA: 10 ppt

PFOS: 10 ppt

North Carolina

Follows federal

NCAC 18C.1518

NCAC 18C.1540

DEQ Water Quality PFAS Standards for North Carolina 

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

North Dakota

Follows federal

No state-specific requirements

NDAC 33.1-17-01-06

NDDEQ Per- and Polyfluoroalkyl Substances (PFAS)

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

Ohio

State-specific guidance

OAC 3745-81-12

Ohio’s PFAS Action Plan

Non-enforceable Action Levels:

PFOA: 4 ppt

PFOS: 4 ppt

Oklahoma

Follows federal

No state-specific requirements

OAC 252:631-3-1

OCA 252:631-1-3

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

Oregon

Follows federal

OAR 333-061-0030

OHA PFAS Rule

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

Pennsylvania

State-specific interim requirements

25 Pa. Code 109.202

25 Pa. Code 109.201

Pennsylvania DEP PFAS MCL Rule

Interim MCLs:

PFOA: 14 ppt

PFOS: 18 ppt

Rhode Island

State-specific interim requirements

216 RICR 50-05-1

R.I. Gen. Laws 46-32

Rhode Island DOH Data on PFAS in Drinking Water

Rhode Island PFAS Regulations and the Emerging Contaminants in Small or Disadvantaged Communities Grant Program

Interim MCLs: PFOS, PFOA, PFDA, PFNA, PFHxS, and PFHpA: 20 ppt (individually or combined)

South Carolina

Follows federal

No state-specific requirements

S.C. Code Regs. R.61-58.5(D)

S.C. Code 44-55-40(G)

SCDES Per- and Polyfluoroalkyl Substances (PFAS) 

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

South Dakota

Follows federal

No state-specific requirements

S.D. Admin. R. 74:04:12:21

South Dakota DANR PFAS Information

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

Tennessee

Follows federal

No state-specific requirements

Tenn. Code Ann. 4-5-232

Tenn. Comp. R. & Regs. 0400-45-01

Tennessee Senate Bill 880

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

Texas

Follows federal

No state-specific requirements

TAC Rule 290.101

TAC Rule 290.107

TAC Rule 290.104

TCEQ Per- and Polyfluoroalkyl Substances (PFAS) in Drinking Water

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

Utah

Follows federal

No state-specific PFAS requirements

Utah Admin. Code R309-200-5

UC 19-4-104

Utah DEQ Drinking Water: PFAS

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

Vermont

State-specific interim requirements

CVR 12-030-003

Vermont DEC PFAS in Drinking Water

Interim MCLs: PFOS, PFOA, PFHxS, PFNA, and PFHpA: 20 ppt (combined)

Virginia

Follows federal

12VAC5-590-340

1VAC30-41-55

Va. Code 62.1-44.34

VDH Per- and Polyfluoroalkyl Substances (PFAS) in Drinking Water 

VDEQ Per- and Polyfluoroalkyl Substances (PFAS)

VDEQ Monitoring and Self-Reporting FAQ

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

Washington

Follows federal

State-specific interim guidance

WAC 246-290-315

WAC 246-290-310

WAC 246-290-320(d)

Washington State DOH PFAS Rules, Regulations, and Government Roles in Our State

Interim SALs:

PFOA: 10 ppt

PFOS: 15 ppt

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

West Virginia

Follows federal

No state-specific requirements

64CSR3

WV Code 22-11C

WVDEP Per- and Polyfluoroalkyl Substances (PFAS)

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

Wisconsin

Follows federal

State-specific interim requirements

Wis. Adm. Code NR 809.20(1)

Wisconsin DNR NR 908 Safe Drinking Water Standards Update

Interim MCLs: PFOS and PFOA: 70 ppt (individually or combined)

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt

Wyoming

Follows federal

No state-specific requirements

WDEQ Water and Wastewater

WDEQ PFAS in Drinking Water Monitoring Assistance Program 

MCLs:

PFOA: 4 ppt

PFOS: 4 ppt