Ohio Tap Water Quality
Explore tap water quality data for counties across Ohio. View water system reports, track violations, monitor drinking water safety, and check fluoridation status in your community.
Total Counties
88
Communities with public water systems
Total Population
10,556,123
Residents served by public water systems
Water Systems
1,138
Public water systems statewide
Serious Violators
20
Systems with serious violations
Counties
88
With water systems
Population
10,556,123
Served by water systems
Water Systems
1,138
Total water systems
Violators
20
Systems with serious violations
Searching by your address yields the most accurate results. Searching by town or water system may not show all systems due to how the EPA categorizes data. Some towns may be listed under counties, and water system boundaries don't always align with town boundaries.
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Ohio Counties
Adams
Population: 31,068
Water Systems: 6
Allen
Population: 84,197
Water Systems: 8
Ashland
Population: 25,743
Water Systems: 10
Ashtabula
Population: 79,351
Water Systems: 12
Athens
Population: 75,476
Water Systems: 13
Auglaize
Population: 30,093
Water Systems: 8
Belmont
Population: 62,529
Water Systems: 14
Brown
Population: 47,745
Water Systems: 9
Butler
Population: 375,185
Water Systems: 13
Carroll
Population: 6,981
Water Systems: 6
Champaign
Population: 18,684
Water Systems: 11
Clark
Population: 93,946
Water Systems: 27
Clermont
Population: 189,721
Water Systems: 10
Clinton
Population: 20,927
Water Systems: 5
Columbiana
Population: 59,306
Water Systems: 17
Coshocton
Population: 14,604
Water Systems: 7
Crawford
Population: 27,788
Water Systems: 4
Cuyahoga
Population: 1,399,079
Water Systems: 7
Darke
Population: 25,006
Water Systems: 11
Defiance
Population: 24,753
Water Systems: 9
Delaware
Population: 195,181
Water Systems: 3
Erie
Population: 81,167
Water Systems: 12
Fairfield
Population: 93,723
Water Systems: 21
Fayette
Population: 23,765
Water Systems: 7
Franklin
Population: 1,477,038
Water Systems: 30
Fulton
Population: 25,128
Water Systems: 9
Gallia
Population: 28,959
Water Systems: 3
Geauga
Population: 22,409
Water Systems: 31
Greene
Population: 167,849
Water Systems: 19
Guernsey
Population: 28,937
Water Systems: 6
Hamilton
Population: 829,012
Water Systems: 12
Hancock
Population: 59,349
Water Systems: 8
Hardin
Population: 18,536
Water Systems: 8
Harrison
Population: 10,785
Water Systems: 15
Henry
Population: 14,885
Water Systems: 10
Highland
Population: 42,501
Water Systems: 5
Hocking
Population: 9,077
Water Systems: 7
Holmes
Population: 10,828
Water Systems: 11
Huron
Population: 65,234
Water Systems: 14
Jackson
Population: 36,466
Water Systems: 6
Jefferson
Population: 56,831
Water Systems: 18
Knox
Population: 31,478
Water Systems: 10
Lake
Population: 228,741
Water Systems: 6
Lawrence
Population: 61,075
Water Systems: 6
Licking
Population: 110,731
Water Systems: 22
Logan
Population: 22,447
Water Systems: 16
Lorain
Population: 329,650
Water Systems: 16
Lucas
Population: 547,329
Water Systems: 8
Madison
Population: 31,715
Water Systems: 17
Mahoning
Population: 207,862
Water Systems: 12
Marion
Population: 47,505
Water Systems: 4
Medina
Population: 108,067
Water Systems: 14
Meigs
Population: 28,497
Water Systems: 6
Mercer
Population: 22,904
Water Systems: 9
Miami
Population: 88,642
Water Systems: 16
Monroe
Population: 13,313
Water Systems: 6
Montgomery
Population: 512,625
Water Systems: 23
Morgan
Population: 5,135
Water Systems: 8
Morrow
Population: 7,140
Water Systems: 5
Muskingum
Population: 69,664
Water Systems: 11
Noble
Population: 11,421
Water Systems: 6
Ottawa
Population: 38,472
Water Systems: 10
Paulding
Population: 7,762
Water Systems: 6
Perry
Population: 26,710
Water Systems: 21
Pickaway
Population: 41,285
Water Systems: 20
Pike
Population: 24,779
Water Systems: 8
Portage
Population: 101,221
Water Systems: 34
Preble
Population: 21,241
Water Systems: 12
Putnam
Population: 15,535
Water Systems: 10
Richland
Population: 89,754
Water Systems: 48
Ross
Population: 69,602
Water Systems: 7
Sandusky
Population: 30,061
Water Systems: 7
Scioto
Population: 86,751
Water Systems: 17
Seneca
Population: 38,796
Water Systems: 11
Shelby
Population: 29,127
Water Systems: 16
Stark
Population: 289,089
Water Systems: 38
Summit
Population: 438,951
Water Systems: 33
Trumbull
Population: 151,114
Water Systems: 29
Tuscarawas
Population: 62,233
Water Systems: 14
Union
Population: 28,779
Water Systems: 4
Van Wert
Population: 13,632
Water Systems: 5
Vinton
Population: 3,730
Water Systems: 3
Warren
Population: 210,509
Water Systems: 17
Washington
Population: 60,927
Water Systems: 15
Wayne
Population: 58,748
Water Systems: 32
Williams
Population: 21,708
Water Systems: 13
Wood
Population: 107,776
Water Systems: 21
Wyandot
Population: 12,048
Water Systems: 4