Browse state water-system results

Explore PFAS drinking-water results by state

Browse active community water systems with enough required UCMR 5 samples to calculate a yearly average. Each state page counts every water system once.

56 jurisdictionsUnit community water systemRelease ucmr5-2026-01-15-analysis-v0.2Updated 2026-09-10

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These percentages summarize water systems, not ZIP codes or households.

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Key terms“Complete monitoring” means at least one sampling location had all required samples needed for a yearly average. An “EPA-based study benchmark” is the unrounded cutoff this research uses to reproduce EPA’s January 2026 technical-assistance classification around the April 2024 federal levels. It is not a current standard or compliance finding. These percentages do not determine household exposure or health risk.

Northeast

9 pages

Connecticut

45.9%of systems with complete monitoring had a yearly average at or above a study benchmark

28 of 61 systemsView systems

Maine

5.9%of systems with complete monitoring had a yearly average at or above a study benchmark

2 of 34 systemsView systems

Massachusetts

26.9%of systems with complete monitoring had a yearly average at or above a study benchmark

67 of 249 systemsView systems

New Hampshire

17.4%of systems with complete monitoring had a yearly average at or above a study benchmark

8 of 46 systemsView systems

New Jersey

45.7%of systems with complete monitoring had a yearly average at or above a study benchmark

105 of 230 systemsView systems

New York

10.2%of systems with complete monitoring had a yearly average at or above a study benchmark

30 of 293 systemsView systems

Pennsylvania

24.5%of systems with complete monitoring had a yearly average at or above a study benchmark

81 of 331 systemsView systems

Rhode Island

29.2%of systems with complete monitoring had a yearly average at or above a study benchmark

7 of 24 systemsView systems

Vermont

0.0%of systems with complete monitoring had a yearly average at or above a study benchmark

0 of 30 systemsView systems

Midwest

12 pages

Illinois

3.0%of systems with complete monitoring had a yearly average at or above a study benchmark

13 of 436 systemsView systems

Indiana

2.9%of systems with complete monitoring had a yearly average at or above a study benchmark

6 of 208 systemsView systems

Iowa

0.8%of systems with complete monitoring had a yearly average at or above a study benchmark

1 of 132 systemsView systems

Kansas

2.2%of systems with complete monitoring had a yearly average at or above a study benchmark

2 of 89 systemsView systems

Michigan

1.7%of systems with complete monitoring had a yearly average at or above a study benchmark

5 of 291 systemsView systems

Minnesota

5.6%of systems with complete monitoring had a yearly average at or above a study benchmark

10 of 178 systemsView systems

Missouri

2.4%of systems with complete monitoring had a yearly average at or above a study benchmark

5 of 205 systemsView systems

Nebraska

6.5%of systems with complete monitoring had a yearly average at or above a study benchmark

3 of 46 systemsView systems

North Dakota

0.0%of systems with complete monitoring had a yearly average at or above a study benchmark

0 of 36 systemsView systems

Ohio

9.7%of systems with complete monitoring had a yearly average at or above a study benchmark

29 of 300 systemsView systems

South Dakota

0.0%of systems with complete monitoring had a yearly average at or above a study benchmark

0 of 52 systemsView systems

Wisconsin

9.8%of systems with complete monitoring had a yearly average at or above a study benchmark

17 of 174 systemsView systems

South

17 pages

Alabama

19.2%of systems with complete monitoring had a yearly average at or above a study benchmark

53 of 276 systemsView systems

Arkansas

0.0%of systems with complete monitoring had a yearly average at or above a study benchmark

0 of 148 systemsView systems

Delaware

34.3%of systems with complete monitoring had a yearly average at or above a study benchmark

12 of 35 systemsView systems

District of Columbia

0.0%of systems with complete monitoring had a yearly average at or above a study benchmark

0 of 3 systemsView systems

Florida

33.2%of systems with complete monitoring had a yearly average at or above a study benchmark

122 of 367 systemsView systems

Georgia

11.4%of systems with complete monitoring had a yearly average at or above a study benchmark

27 of 237 systemsView systems

Kentucky

4.4%of systems with complete monitoring had a yearly average at or above a study benchmark

9 of 205 systemsView systems

Louisiana

0.0%of systems with complete monitoring had a yearly average at or above a study benchmark

0 of 238 systemsView systems

Maryland

16.9%of systems with complete monitoring had a yearly average at or above a study benchmark

12 of 71 systemsView systems

Mississippi

1.9%of systems with complete monitoring had a yearly average at or above a study benchmark

4 of 209 systemsView systems

North Carolina

24.0%of systems with complete monitoring had a yearly average at or above a study benchmark

61 of 254 systemsView systems

Oklahoma

5.1%of systems with complete monitoring had a yearly average at or above a study benchmark

7 of 136 systemsView systems

South Carolina

32.3%of systems with complete monitoring had a yearly average at or above a study benchmark

43 of 133 systemsView systems

Tennessee

6.3%of systems with complete monitoring had a yearly average at or above a study benchmark

15 of 238 systemsView systems

Texas

2.6%of systems with complete monitoring had a yearly average at or above a study benchmark

25 of 954 systemsView systems

Virginia

7.5%of systems with complete monitoring had a yearly average at or above a study benchmark

11 of 146 systemsView systems

West Virginia

11.4%of systems with complete monitoring had a yearly average at or above a study benchmark

10 of 88 systemsView systems

West

13 pages

Alaska

9.1%of systems with complete monitoring had a yearly average at or above a study benchmark

2 of 22 systemsView systems

Arizona

13.9%of systems with complete monitoring had a yearly average at or above a study benchmark

21 of 151 systemsView systems

California

19.3%of systems with complete monitoring had a yearly average at or above a study benchmark

120 of 623 systemsView systems

Colorado

2.9%of systems with complete monitoring had a yearly average at or above a study benchmark

4 of 136 systemsView systems

Hawaii

0.0%of systems with complete monitoring had a yearly average at or above a study benchmark

0 of 41 systemsView systems

Idaho

3.7%of systems with complete monitoring had a yearly average at or above a study benchmark

2 of 54 systemsView systems

Montana

0.0%of systems with complete monitoring had a yearly average at or above a study benchmark

0 of 34 systemsView systems

Nevada

8.8%of systems with complete monitoring had a yearly average at or above a study benchmark

3 of 34 systemsView systems

New Mexico

1.4%of systems with complete monitoring had a yearly average at or above a study benchmark

1 of 74 systemsView systems

Oregon

8.0%of systems with complete monitoring had a yearly average at or above a study benchmark

9 of 113 systemsView systems

Utah

1.7%of systems with complete monitoring had a yearly average at or above a study benchmark

2 of 120 systemsView systems

Washington

8.3%of systems with complete monitoring had a yearly average at or above a study benchmark

19 of 229 systemsView systems

Wyoming

3.6%of systems with complete monitoring had a yearly average at or above a study benchmark

1 of 28 systemsView systems

Territories

5 pages

American Samoa

0.0%of systems with complete monitoring had a yearly average at or above a study benchmark

0 of 1 systemsView systems

Guam

33.3%of systems with complete monitoring had a yearly average at or above a study benchmark

1 of 3 systemsView systems

Northern Mariana Islands

100.0%of systems with complete monitoring had a yearly average at or above a study benchmark

1 of 1 systemsView systems

Puerto Rico

16.1%of systems with complete monitoring had a yearly average at or above a study benchmark

14 of 87 systemsView systems

U.S. Virgin Islands

0.0%of systems with complete monitoring had a yearly average at or above a study benchmark

0 of 2 systemsView systems