waterbycounty

Ohio Water Quality

Drinking water data for all 88 counties.

Avg Water Score

99.9

State Grade

A

Counties with Data

88

of 88 total

All Ohio Counties

CountyWater Score
Adams County100.0
Allen County100.0
Ashland County100.0
Ashtabula County100.0
Auglaize County100.0
Belmont County100.0
Butler County100.0
Champaign County100.0
Clermont County100.0
Clinton County100.0
Columbiana County100.0
Coshocton County100.0
Cuyahoga County100.0
Delaware County100.0
Erie County100.0
Fairfield County100.0
Fayette County100.0
Franklin County100.0
Gallia County100.0
Greene County100.0
Hamilton County100.0
Highland County100.0
Huron County100.0
Jackson County100.0
Knox County100.0
Lake County100.0
Lawrence County100.0
Licking County100.0
Lorain County100.0
Lucas County100.0
Mahoning County100.0
Marion County100.0
Medina County100.0
Mercer County100.0
Miami County100.0
Montgomery County100.0
Morrow County100.0
Pike County100.0
Portage County100.0
Ross County100.0
Sandusky County100.0
Scioto County100.0
Shelby County100.0
Stark County100.0
Summit County100.0
Trumbull County100.0
Tuscarawas County100.0
Union County100.0
Warren County100.0
Washington County100.0
Wood County100.0
Wyandot County100.0
Brown County99.9
Carroll County99.9
Clark County99.9
Darke County99.9
Guernsey County99.9
Hardin County99.9
Jefferson County99.9
Logan County99.9
Madison County99.9
Meigs County99.9
Noble County99.9
Ottawa County99.9
Pickaway County99.9
Preble County99.9
Richland County99.9
Seneca County99.9
Vinton County99.9
Wayne County99.9
Williams County99.9
Athens County99.8
Geauga County99.8
Hancock County99.8
Hocking County99.8
Crawford County99.7
Holmes County99.7
Monroe County99.7
Muskingum County99.7
Harrison County99.6
Morgan County99.6
Perry County99.6
Putnam County99.6
Paulding County99.3
Van Wert County99.0
Defiance County98.8
Fulton County98.7
Henry County97.1

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Data Source

Water quality data sourced from the EPA Safe Drinking Water Information System (SDWIS) via the ECHO enforcement database. Scores reflect compliance history and health-based violation counts.

Disclaimer: This data is informational only. It is not health, legal, or professional advice. For concerns about your specific water supply, contact your local water utility.

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