WaterVerge
Alerts Cities States PFAS Tracker Guides News Maps Glossary Methodology

Water Quality by State

Average water quality grades across 52 states with 15,595 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+
353 cities
6.1M population
83.2

Alaska

C-
79 cities
673K population
55.4

Arizona

C+
292 cities
7.5M population
67.5

Arkansas

B
345 cities
3.0M population
79.7

California

B
694 cities
40.3M population
76.5

Colorado

C+
246 cities
7.2M population
66.1

Connecticut

C-
158 cities
28.4M population
58.8

Delaware

B
43 cities
1.4M population
77.1

District of Columbia

B
6 cities
671K population
76.8

Florida

C+
388 cities
22.0M population
68.9

Georgia

B-
378 cities
10.5M population
73.4

Hawaii

A
66 cities
1.5M population
91.6

Idaho

C+
139 cities
1.6M population
68.2

Illinois

B
891 cities
12.1M population
79.7

Indiana

B
414 cities
5.4M population
78.1

Iowa

A-
436 cities
2.9M population
87.5

Kansas

B
323 cities
2.8M population
75.8

Kentucky

B
246 cities
4.6M population
79.3

Louisiana

C+
309 cities
5.2M population
65.5

Maine

B+
168 cities
2.7M population
80.4

Maryland

B-
107 cities
5.4M population
74.4

Massachusetts

B
280 cities
10.0M population
79.3

Michigan

B+
520 cities
7.6M population
81

Minnesota

A-
466 cities
4.7M population
87.5

Mississippi

C+
320 cities
3.2M population
68.7

Missouri

B
509 cities
6.2M population
78.7

Montana

C+
115 cities
802K population
65.7

Nebraska

A-
200 cities
1.7M population
85.8

Nevada

B
66 cities
3.6M population
75.2

New Hampshire

C
119 cities
870K population
62.3

New Jersey

B-
435 cities
82.3M population
70.4

New Mexico

C-
163 cities
2.0M population
58.3

New York

B+
855 cities
50.1M population
80.7

North Carolina

C+
417 cities
9.5M population
68.6

North Dakota

A-
103 cities
722K population
85.4

Ohio

B
511 cities
10.4M population
77.3

Oklahoma

C
358 cities
3.6M population
61.3

Oregon

C
213 cities
3.7M population
62.3

Pennsylvania

C-
560 cities
11.4M population
58.3

QC

A
1 cities
897 population
91.6

Rhode Island

C+
35 cities
3.1M population
69.1

South Carolina

B+
196 cities
4.6M population
81.8

South Dakota

B+
141 cities
976K population
81.3

Tennessee

B+
299 cities
8.4M population
82.8

Texas

C+
1067 cities
32.2M population
67.5

Utah

B-
177 cities
3.7M population
70.2

Vermont

B-
105 cities
456K population
74.3

Virginia

B
230 cities
7.4M population
78.9

Washington

B-
294 cities
9.2M population
70.1

West Virginia

C
248 cities
1.6M population
61.3

Wisconsin

B
446 cities
4.2M population
78

Wyoming

C+
65 cities
535K population
69.5