U.S. Tap Water Quality by State
Explore tap water quality data across the United States. Track violations, check fluoridation status, and monitor drinking water safety in your community.
Towns
5,172
With water systems
Population
323,169,306
Served by systems
Systems
43,447
Public water systems
Violators
902
Serious violations
Alabama
5,108,468 residents
576 water systems
Alaska
730,000 residents
400 water systems
Arizona
7,400,000 residents
1,500 water systems
Arkansas
3,145,538 residents
689 water systems
California
39,512,223 residents
2,800 water systems
Colorado
5,812,069 residents
2,100 water systems
Connecticut
3,605,944 residents
2,352 water systems
Delaware
1,010,000 residents
450 water systems
Florida
22,244,823 residents
5,200 water systems
Georgia
10,711,908 residents
2,100 water systems
Hawaii
1,441,553 residents
130 water systems
Idaho
1,900,923 residents
2,100 water systems
Illinois
12,582,032 residents
1,750 water systems
Indiana
6,800,000 residents
850 water systems
Iowa
3,200,000 residents
1,100 water systems
Kansas
2,937,880 residents
900 water systems
Kentucky
4,509,394 residents
419 water systems
Louisiana
4,657,757 residents
1,000 water systems
Maine
1,395,722 residents
1,900 water systems
Maryland
6,177,224 residents
462 water systems
Massachusetts
7,029,917 residents
531 water systems
Michigan
10,077,331 residents
1,381 water systems
Minnesota
5,707,390 residents
6,800 water systems
Mississippi
3,000,000 residents
1,100 water systems
Missouri
6,168,187 residents
2,700 water systems
Montana
1,122,867 residents
700 water systems
Nebraska
2,000,000 residents
600 water systems
Nevada
3,143,991 residents
580 water systems
New Hampshire
1,388,992 residents
697 water systems
New Jersey
9,288,994 residents
600 water systems
New Mexico
2,117,522 residents
550 water systems
New York
20,201,249 residents
2,800 water systems
North Carolina
10,700,000 residents
2,000 water systems
North Dakota
770,000 residents
435 water systems
Ohio
2,000,000 residents
600 water systems
Oklahoma
4,019,800 residents
1,300 water systems
Oregon
4,246,155 residents
880 water systems
Pennsylvania
13,002,700 residents
8,000 water systems
Rhode Island
1,097,379 residents
485 water systems
South Carolina
5,190,705 residents
342 water systems
South Dakota
886,667 residents
450 water systems
Tennessee
7,001,803 residents
450 water systems
Texas
29,500,000 residents
6,800 water systems
Utah
3,337,975 residents
472 water systems
Vermont
645,570 residents
420 water systems
Virginia
8,631,393 residents
1,200 water systems
Washington
7,738,692 residents
2,100 water systems
West Virginia
1,800,000 residents
500 water systems
Wisconsin
5,893,718 residents
11,000 water systems
Wyoming
576,851 residents
450 water systems