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 system is counted once on its state page.

56 jurisdictionsUnit community water systemRelease ucmr5-final-aug2026-website-v1Updated 2026-10-19

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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 every required sample needed to calculate a yearly average. It does not mean every location or home was tested. An “EPA-based study benchmark” is a fixed, unrounded research cutoff used to reproduce EPA’s final UCMR 5 technical-assistance classification based on the April 2024 federal levels. It is not a current federal or state standard. These percentages do not determine compliance, household exposure, or health risk.

Northeast

9 pages

Connecticut

46.8%of systems with enough required samples had a yearly average above an EPA comparison level

29 of 62 systemsView systems

Maine

5.3%of systems with enough required samples had a yearly average above an EPA comparison level

2 of 38 systemsView systems

Massachusetts

29.1%of systems with enough required samples had a yearly average above an EPA comparison level

75 of 258 systemsView systems

New Hampshire

18.4%of systems with enough required samples had a yearly average above an EPA comparison level

9 of 49 systemsView systems

New Jersey

46.4%of systems with enough required samples had a yearly average above an EPA comparison level

110 of 237 systemsView systems

New York

9.8%of systems with enough required samples had a yearly average above an EPA comparison level

31 of 317 systemsView systems

Pennsylvania

23.8%of systems with enough required samples had a yearly average above an EPA comparison level

85 of 357 systemsView systems

Rhode Island

26.9%of systems with enough required samples had a yearly average above an EPA comparison level

7 of 26 systemsView systems

Vermont

0.0%of systems with enough required samples had a yearly average above an EPA comparison level

0 of 35 systemsView systems

Midwest

12 pages

Illinois

2.7%of systems with enough required samples had a yearly average above an EPA comparison level

13 of 477 systemsView systems

Indiana

2.7%of systems with enough required samples had a yearly average above an EPA comparison level

6 of 219 systemsView systems

Iowa

0.7%of systems with enough required samples had a yearly average above an EPA comparison level

1 of 146 systemsView systems

Kansas

2.9%of systems with enough required samples had a yearly average above an EPA comparison level

3 of 102 systemsView systems

Michigan

1.6%of systems with enough required samples had a yearly average above an EPA comparison level

5 of 311 systemsView systems

Minnesota

5.1%of systems with enough required samples had a yearly average above an EPA comparison level

10 of 197 systemsView systems

Missouri

2.7%of systems with enough required samples had a yearly average above an EPA comparison level

6 of 225 systemsView systems

Nebraska

5.9%of systems with enough required samples had a yearly average above an EPA comparison level

3 of 51 systemsView systems

North Dakota

0.0%of systems with enough required samples had a yearly average above an EPA comparison level

0 of 38 systemsView systems

Ohio

10.7%of systems with enough required samples had a yearly average above an EPA comparison level

35 of 328 systemsView systems

South Dakota

0.0%of systems with enough required samples had a yearly average above an EPA comparison level

0 of 56 systemsView systems

Wisconsin

9.2%of systems with enough required samples had a yearly average above an EPA comparison level

18 of 196 systemsView systems

South

17 pages

Alabama

18.5%of systems with enough required samples had a yearly average above an EPA comparison level

56 of 303 systemsView systems

Arkansas

0.0%of systems with enough required samples had a yearly average above an EPA comparison level

0 of 170 systemsView systems

Delaware

34.3%of systems with enough required samples had a yearly average above an EPA comparison level

12 of 35 systemsView systems

District of Columbia

0.0%of systems with enough required samples had a yearly average above an EPA comparison level

0 of 3 systemsView systems

Florida

32.6%of systems with enough required samples had a yearly average above an EPA comparison level

124 of 380 systemsView systems

Georgia

10.8%of systems with enough required samples had a yearly average above an EPA comparison level

27 of 249 systemsView systems

Kentucky

3.9%of systems with enough required samples had a yearly average above an EPA comparison level

9 of 229 systemsView systems

Louisiana

0.4%of systems with enough required samples had a yearly average above an EPA comparison level

1 of 258 systemsView systems

Maryland

17.1%of systems with enough required samples had a yearly average above an EPA comparison level

13 of 76 systemsView systems

Mississippi

2.2%of systems with enough required samples had a yearly average above an EPA comparison level

5 of 231 systemsView systems

North Carolina

24.3%of systems with enough required samples had a yearly average above an EPA comparison level

66 of 272 systemsView systems

Oklahoma

4.9%of systems with enough required samples had a yearly average above an EPA comparison level

8 of 162 systemsView systems

South Carolina

34.9%of systems with enough required samples had a yearly average above an EPA comparison level

53 of 152 systemsView systems

Tennessee

6.3%of systems with enough required samples had a yearly average above an EPA comparison level

17 of 271 systemsView systems

Texas

2.5%of systems with enough required samples had a yearly average above an EPA comparison level

28 of 1,104 systemsView systems

Virginia

7.5%of systems with enough required samples had a yearly average above an EPA comparison level

12 of 160 systemsView systems

West Virginia

10.1%of systems with enough required samples had a yearly average above an EPA comparison level

10 of 99 systemsView systems

West

13 pages

Alaska

7.7%of systems with enough required samples had a yearly average above an EPA comparison level

2 of 26 systemsView systems

Arizona

12.7%of systems with enough required samples had a yearly average above an EPA comparison level

21 of 166 systemsView systems

California

19.3%of systems with enough required samples had a yearly average above an EPA comparison level

129 of 670 systemsView systems

Colorado

2.6%of systems with enough required samples had a yearly average above an EPA comparison level

4 of 155 systemsView systems

Hawaii

0.0%of systems with enough required samples had a yearly average above an EPA comparison level

0 of 44 systemsView systems

Idaho

3.3%of systems with enough required samples had a yearly average above an EPA comparison level

2 of 61 systemsView systems

Montana

0.0%of systems with enough required samples had a yearly average above an EPA comparison level

0 of 39 systemsView systems

Nevada

8.1%of systems with enough required samples had a yearly average above an EPA comparison level

3 of 37 systemsView systems

New Mexico

1.2%of systems with enough required samples had a yearly average above an EPA comparison level

1 of 84 systemsView systems

Oregon

7.3%of systems with enough required samples had a yearly average above an EPA comparison level

9 of 123 systemsView systems

Utah

1.6%of systems with enough required samples had a yearly average above an EPA comparison level

2 of 127 systemsView systems

Washington

8.2%of systems with enough required samples had a yearly average above an EPA comparison level

20 of 243 systemsView systems

Wyoming

3.1%of systems with enough required samples had a yearly average above an EPA comparison level

1 of 32 systemsView systems

Territories

5 pages

American Samoa

0.0%of systems with enough required samples had a yearly average above an EPA comparison level

0 of 1 systemsView systems

Guam

20.0%of systems with enough required samples had a yearly average above an EPA comparison level

1 of 5 systemsView systems

Northern Mariana Islands

100.0%of systems with enough required samples had a yearly average above an EPA comparison level

1 of 1 systemsView systems

Puerto Rico

15.6%of systems with enough required samples had a yearly average above an EPA comparison level

15 of 96 systemsView systems

U.S. Virgin Islands

0.0%of systems with enough required samples had a yearly average above an EPA comparison level

0 of 2 systemsView systems