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Water Quality by State

Average water quality grades across 51 states with 15,254 cities tested

Water quality across the US

Click any state to view detailed water quality data, city rankings, and contaminant reports.

Average water quality grade by state — click to explore AL AK AZ CO FL GA IN KS ME MA MN NJ NC ND OK PA SD TX WY CT MO WV IL NM AR CA DE DC HI IA KY MD MI MS MT NH NY OH OR TN UT VA WA WI NE SC ID NV VT LA RI
FDCBA No data
Overall water quality score (0–100) based on violations, lead levels, and PFAS data

Alabama

B+
351 cities
6.0M population
83.3

Alaska

C-
73 cities
654K population
56.1

Arizona

C+
271 cities
6.4M population
68.4

Arkansas

B
345 cities
3.0M population
79.7

California

B
690 cities
39.8M population
76.5

Colorado

C+
244 cities
7.2M population
66.1

Connecticut

C
129 cities
16.5M population
60.8

Delaware

B
40 cities
842K population
76.7

District of Columbia

B
6 cities
671K population
76.8

Florida

C+
366 cities
19.5M population
69.5

Georgia

B-
372 cities
9.2M population
73.3

Hawaii

A
64 cities
1.5M population
91.6

Idaho

C+
139 cities
1.6M population
68.2

Illinois

B
882 cities
11.4M population
79.8

Indiana

B
402 cities
4.7M population
78.7

Iowa

A-
430 cities
2.8M population
87.8

Kansas

B
312 cities
2.8M population
76.1

Kentucky

B
246 cities
4.6M population
79.3

Louisiana

C+
309 cities
5.2M population
65.5

Maine

B+
156 cities
2.2M population
81.4

Maryland

B-
107 cities
5.4M population
74.4

Massachusetts

B
269 cities
7.1M population
79.7

Michigan

B+
513 cities
7.3M population
81

Minnesota

A-
466 cities
4.7M population
87.5

Mississippi

C+
319 cities
3.2M population
68.7

Missouri

B
487 cities
5.6M population
79.1

Montana

C+
110 cities
755K population
65.2

Nebraska

A-
196 cities
1.6M population
85.8

Nevada

B
63 cities
3.1M population
76.4

New Hampshire

C
98 cities
770K population
64.9

New Jersey

B-
426 cities
74.0M population
70.6

New Mexico

C-
153 cities
1.9M population
58.6

New York

B+
810 cities
42.6M population
81.6

North Carolina

C+
400 cities
8.5M population
69.2

North Dakota

A-
101 cities
704K population
85.5

Ohio

B
511 cities
10.4M population
77.3

Oklahoma

C
357 cities
3.6M population
61.2

Oregon

C
213 cities
3.7M population
62.3

Pennsylvania

C-
559 cities
11.4M population
58.3

Rhode Island

B-
32 cities
2.4M population
71.3

South Carolina

B+
195 cities
4.4M population
81.8

South Dakota

B+
137 cities
917K population
81.6

Tennessee

B+
299 cities
8.1M population
82.8

Texas

C+
1067 cities
32.2M population
67.5

Utah

B-
177 cities
3.7M population
70.2

Vermont

B
90 cities
394K population
76.7

Virginia

B
229 cities
7.3M population
78.9

Washington

B-
294 cities
9.2M population
70.1

West Virginia

C
245 cities
1.5M population
61.5

Wisconsin

B
441 cities
4.1M population
78.2

Wyoming

C+
63 cities
496K population
69.7