Ohio County Water Quality Reports

Adams County, OH: 2 Health Violations — 50/100 (2026)

2026 report: Adams County, OH scores 50/100 (Grade D). 13 ZIP codes analyzed. 12 EPA violations found. Free report with contaminant data and filter picks.

Allen County, OH: 12 Health Violations — 55/100 (2026)

2026 report: Allen County, OH scores 55/100 (Grade C). 16 ZIP codes analyzed. 91 EPA violations found. Free report with contaminant data and filter picks.

Ashland County, OH: 2 Health Violations — 55/100 (2026)

2026 report: Ashland County, OH scores 55/100 (Grade C). 10 ZIP codes analyzed. 9 EPA violations found. Free report with contaminant data and filter picks.

Ashtabula County, OH: 1 Health Violation — 66/100 (2026)

2026 report: Ashtabula County, OH scores 66/100 (Grade C). 19 ZIP codes analyzed. 24 EPA violations found. Free report with contaminant data and filter ...

Athens County, OH: 11 Health Violations — 66/100 (2026)

2026 report: Athens County, OH scores 66/100 (Grade C). 21 ZIP codes analyzed. 38 EPA violations found. Free report with contaminant data and filter picks.

Auglaize County, OH: 1 Health Violation — 50/100 (2026)

2026 report: Auglaize County, OH scores 50/100 (Grade D). 9 ZIP codes analyzed. 11 EPA violations found. Free report with contaminant data and filter pi...

Belmont County, OH: 4 Health Violations — 53/100 (2026)

2026 report: Belmont County, OH scores 53/100 (Grade D). 24 ZIP codes analyzed. 50 EPA violations found. Free report with contaminant data and filter pi...

Brown County, OH: 3 Health Violations — 66/100 (2026)

2026 report: Brown County, OH scores 66/100 (Grade C). 12 ZIP codes analyzed. 17 EPA violations found. Free report with contaminant data and filter picks.

Butler County, OH: 51 Violations — 60/100 (2026)

2026 report: Butler County, OH scores 60/100 (Grade C). 18 ZIP codes analyzed. 51 EPA violations found. Free report with contaminant data and filter picks.

Carroll County, OH: 2 Health Violations — 56/100 (2026)

2026 report: Carroll County, OH scores 56/100 (Grade C). 8 ZIP codes analyzed. 12 EPA violations found. Free report with contaminant data and filter picks.

Champaign County, OH: 1 Health Violation — 52/100 (2026)

2026 report: Champaign County, OH scores 52/100 (Grade D). 12 ZIP codes analyzed. 21 EPA violations found. Free report with contaminant data and filter ...

Clark County, OH: 7 Health Violations — 51/100 (2026)

2026 report: Clark County, OH scores 51/100 (Grade D). 21 ZIP codes analyzed. 23 EPA violations found. Free report with contaminant data and filter picks.

Clermont County, OH: 2 Health Violations — 66/100 (2026)

2026 report: Clermont County, OH scores 66/100 (Grade C). 15 ZIP codes analyzed. 20 EPA violations found. Free report with contaminant data and filter p...

Clinton County, OH: 1 Health Violation — 52/100 (2026)

2026 report: Clinton County, OH scores 52/100 (Grade D). 11 ZIP codes analyzed. 6 EPA violations found. Free report with contaminant data and filter picks.

Columbiana County, OH: Lead Above EPA Limits — 49/100 (2026)

2026 report: Columbiana County, OH scores 49/100 (Grade D). 29 ZIP codes analyzed. 28 EPA violations found. Lead above EPA limits. Free report with cont...

Coshocton County, OH: 2 Violations — 49/100 (2026)

2026 report: Coshocton County, OH scores 49/100 (Grade D). 10 ZIP codes analyzed. 2 EPA violations found. Free report with contaminant data and filter p...

Crawford County, OH: 5 Health Violations — 49/100 (2026)

2026 report: Crawford County, OH scores 49/100 (Grade D). 9 ZIP codes analyzed. 11 EPA violations found. Free report with contaminant data and filter pi...

Cuyahoga County, OH: 64 Violations — 74/100 (2026)

2026 report: Cuyahoga County, OH scores 74/100 (Grade B). 60 ZIP codes analyzed. 64 EPA violations found. Free report with contaminant data and filter p...

Darke County, OH: 1 Health Violation — 59/100 (2026)

2026 report: Darke County, OH scores 59/100 (Grade C). 11 ZIP codes analyzed. 8 EPA violations found. Free report with contaminant data and filter picks.

Defiance County, OH: 17 Health Violations — 65/100 (2026)

2026 report: Defiance County, OH scores 65/100 (Grade C). 8 ZIP codes analyzed. 28 EPA violations found. Free report with contaminant data and filter pi...

Delaware County, OH: 3 Health Violations — 57/100 (2026)

2026 report: Delaware County, OH scores 57/100 (Grade C). 9 ZIP codes analyzed. 16 EPA violations found. Free report with contaminant data and filter pi...

Erie County, OH: 2 Health Violations — 69/100 (2026)

2026 report: Erie County, OH scores 69/100 (Grade C). 14 ZIP codes analyzed. 14 EPA violations found. Free report with contaminant data and filter picks.

Fairfield County, OH: 2 Health Violations — 57/100 (2026)

2026 report: Fairfield County, OH scores 57/100 (Grade C). 15 ZIP codes analyzed. 34 EPA violations found. Free report with contaminant data and filter ...

Fayette County, OH: 1 Health Violation — 62/100 (2026)

2026 report: Fayette County, OH scores 62/100 (Grade C). 5 ZIP codes analyzed. 16 EPA violations found. Free report with contaminant data and filter picks.

Franklin County, OH: 95 Health Violations — 61/100 (2026)

2026 report: Franklin County, OH scores 61/100 (Grade C). 75 ZIP codes analyzed. 326 EPA violations found. Free report with contaminant data and filter ...

Fulton County, OH: 21 Health Violations — 66/100 (2026)

2026 report: Fulton County, OH scores 66/100 (Grade C). 9 ZIP codes analyzed. 28 EPA violations found. Free report with contaminant data and filter picks.

Gallia County, OH: 4 Violations — 65/100 (2026)

2026 report: Gallia County, OH scores 65/100 (Grade C). 7 ZIP codes analyzed. 4 EPA violations found. Free report with contaminant data and filter picks.

Geauga County, OH: 1 Health Violation — 64/100 (2026)

2026 report: Geauga County, OH scores 64/100 (Grade C). 21 ZIP codes analyzed. 19 EPA violations found. Free report with contaminant data and filter picks.

Greene County, OH: Lead Above EPA Limits — 53/100 (2026)

2026 report: Greene County, OH scores 53/100 (Grade D). 16 ZIP codes analyzed. 40 EPA violations found. Lead above EPA limits. Free report with contamin...

Guernsey County, OH: 4 Health Violations — 50/100 (2026)

2026 report: Guernsey County, OH scores 50/100 (Grade D). 13 ZIP codes analyzed. 10 EPA violations found. Free report with contaminant data and filter p...

Hamilton County, OH: 1 Health Violation — 64/100 (2026)

2026 report: Hamilton County, OH scores 64/100 (Grade C). 78 ZIP codes analyzed. 74 EPA violations found. Free report with contaminant data and filter p...

Hancock County, OH: 2 Health Violations — 52/100 (2026)

2026 report: Hancock County, OH scores 52/100 (Grade D). 14 ZIP codes analyzed. 7 EPA violations found. Free report with contaminant data and filter picks.

Hardin County, OH: 2 Health Violations — 52/100 (2026)

2026 report: Hardin County, OH scores 52/100 (Grade D). 8 ZIP codes analyzed. 11 EPA violations found. Free report with contaminant data and filter picks.

Harrison County, OH: 8 Health Violations — 49/100 (2026)

2026 report: Harrison County, OH scores 49/100 (Grade D). 21 ZIP codes analyzed. 37 EPA violations found. Free report with contaminant data and filter p...

Henry County, OH: 27 Health Violations — 60/100 (2026)

2026 report: Henry County, OH scores 60/100 (Grade C). 18 ZIP codes analyzed. 44 EPA violations found. Free report with contaminant data and filter picks.

Highland County, OH: 3 Violations — 72/100 (2026)

2026 report: Highland County, OH scores 72/100 (Grade B). 3 ZIP codes analyzed. 3 EPA violations found. Free report with contaminant data and filter picks.

Hocking County, OH: 3 Health Violations — 67/100 (2026)

2026 report: Hocking County, OH scores 67/100 (Grade C). 10 ZIP codes analyzed. 20 EPA violations found. Free report with contaminant data and filter pi...

Holmes County, OH: 8 Health Violations — 54/100 (2026)

2026 report: Holmes County, OH scores 54/100 (Grade D). 16 ZIP codes analyzed. 42 EPA violations found. Free report with contaminant data and filter picks.

Huron County, OH: 3 Health Violations — 52/100 (2026)

2026 report: Huron County, OH scores 52/100 (Grade D). 16 ZIP codes analyzed. 16 EPA violations found. Free report with contaminant data and filter picks.

Jackson County, OH: 3 Health Violations — 68/100 (2026)

2026 report: Jackson County, OH scores 68/100 (Grade C). 7 ZIP codes analyzed. 12 EPA violations found. Free report with contaminant data and filter picks.

Jefferson County, OH: 9 Health Violations — 53/100 (2026)

2026 report: Jefferson County, OH scores 53/100 (Grade D). 15 ZIP codes analyzed. 69 EPA violations found. Free report with contaminant data and filter ...

Knox County, OH: 4 Violations — 56/100 (2026)

2026 report: Knox County, OH scores 56/100 (Grade C). 9 ZIP codes analyzed. 4 EPA violations found. Free report with contaminant data and filter picks.

Lake County, OH: 3 Violations — 71/100 (2026)

2026 report: Lake County, OH scores 71/100 (Grade B). 4 ZIP codes analyzed. 3 EPA violations found. Free report with contaminant data and filter picks.

Lawrence County, OH: 1 Health Violation — 61/100 (2026)

2026 report: Lawrence County, OH scores 61/100 (Grade C). 10 ZIP codes analyzed. 7 EPA violations found. Free report with contaminant data and filter pi...

Licking County, OH: 2 Health Violations — 58/100 (2026)

2026 report: Licking County, OH scores 58/100 (Grade C). 18 ZIP codes analyzed. 15 EPA violations found. Free report with contaminant data and filter pi...

Logan County, OH: 3 Health Violations — 53/100 (2026)

2026 report: Logan County, OH scores 53/100 (Grade D). 19 ZIP codes analyzed. 27 EPA violations found. Free report with contaminant data and filter picks.

Lorain County, OH: 5 Health Violations — 70/100 (2026)

2026 report: Lorain County, OH scores 70/100 (Grade B). 16 ZIP codes analyzed. 18 EPA violations found. Free report with contaminant data and filter picks.

Lucas County, OH: 31 Health Violations — 71/100 (2026)

2026 report: Lucas County, OH scores 71/100 (Grade B). 43 ZIP codes analyzed. 98 EPA violations found. Free report with contaminant data and filter picks.

Madison County, OH: 1 Health Violation — 53/100 (2026)

2026 report: Madison County, OH scores 53/100 (Grade D). 6 ZIP codes analyzed. 21 EPA violations found. Free report with contaminant data and filter picks.

Mahoning County, OH: 67 Violations — 70/100 (2026)

2026 report: Mahoning County, OH scores 70/100 (Grade B). 31 ZIP codes analyzed. 67 EPA violations found. Free report with contaminant data and filter p...

Marion County, OH: 12 Violations — 55/100 (2026)

2026 report: Marion County, OH scores 55/100 (Grade C). 8 ZIP codes analyzed. 12 EPA violations found. Free report with contaminant data and filter picks.

Medina County, OH: 2 Health Violations — 68/100 (2026)

2026 report: Medina County, OH scores 68/100 (Grade C). 17 ZIP codes analyzed. 12 EPA violations found. Free report with contaminant data and filter picks.

Meigs County, OH: 4 Health Violations — 69/100 (2026)

2026 report: Meigs County, OH scores 69/100 (Grade C). 10 ZIP codes analyzed. 24 EPA violations found. Free report with contaminant data and filter picks.

Mercer County, OH: 12 Violations — 54/100 (2026)

2026 report: Mercer County, OH scores 54/100 (Grade D). 8 ZIP codes analyzed. 12 EPA violations found. Free report with contaminant data and filter picks.

Miami County, OH: 1 Health Violation — 54/100 (2026)

2026 report: Miami County, OH scores 54/100 (Grade D). 16 ZIP codes analyzed. 34 EPA violations found. Free report with contaminant data and filter picks.

Monroe County, OH: 1 Health Violation — 67/100 (2026)

2026 report: Monroe County, OH scores 67/100 (Grade C). 10 ZIP codes analyzed. 7 EPA violations found. Free report with contaminant data and filter picks.

Montgomery County, OH: Lead Above EPA Limits — 42/100 (2026)

2026 report: Montgomery County, OH scores 42/100 (Grade D). 54 ZIP codes analyzed. 236 EPA violations found. Lead above EPA limits. Free report with con...

Morgan County, OH: 1 Health Violation — 66/100 (2026)

2026 report: Morgan County, OH scores 66/100 (Grade C). 5 ZIP codes analyzed. 4 EPA violations found. Free report with contaminant data and filter picks.

Morrow County, OH: 2 Violations — 50/100 (2026)

2026 report: Morrow County, OH scores 50/100 (Grade D). 5 ZIP codes analyzed. 2 EPA violations found. Free report with contaminant data and filter picks.

Muskingum County, OH: 15 Health Violations — 49/100 (2026)

2026 report: Muskingum County, OH scores 49/100 (Grade D). 18 ZIP codes analyzed. 25 EPA violations found. Free report with contaminant data and filter ...

Noble County, OH: 5 Health Violations — 65/100 (2026)

2026 report: Noble County, OH scores 65/100 (Grade C). 8 ZIP codes analyzed. 20 EPA violations found. Free report with contaminant data and filter picks.

Ottawa County, OH: 1 Health Violation — 59/100 (2026)

2026 report: Ottawa County, OH scores 59/100 (Grade C). 12 ZIP codes analyzed. 4 EPA violations found. Free report with contaminant data and filter picks.

Paulding County, OH: 4 Health Violations — 69/100 (2026)

2026 report: Paulding County, OH scores 69/100 (Grade C). 6 ZIP codes analyzed. 14 EPA violations found. Free report with contaminant data and filter pi...

Perry County, OH: 11 Health Violations — 59/100 (2026)

2026 report: Perry County, OH scores 59/100 (Grade C). 9 ZIP codes analyzed. 37 EPA violations found. Free report with contaminant data and filter picks.

Pickaway County, OH: 10 Violations — 61/100 (2026)

2026 report: Pickaway County, OH scores 61/100 (Grade C). 5 ZIP codes analyzed. 10 EPA violations found. Free report with contaminant data and filter pi...

Pike County, OH: 20 Violations — 52/100 (2026)

2026 report: Pike County, OH scores 52/100 (Grade D). 7 ZIP codes analyzed. 20 EPA violations found. Free report with contaminant data and filter picks.

Portage County, OH: 6 Health Violations — 71/100 (2026)

2026 report: Portage County, OH scores 71/100 (Grade B). 14 ZIP codes analyzed. 22 EPA violations found. Free report with contaminant data and filter pi...

Preble County, OH: 5 Health Violations — 62/100 (2026)

2026 report: Preble County, OH scores 62/100 (Grade C). 12 ZIP codes analyzed. 28 EPA violations found. Free report with contaminant data and filter picks.

Putnam County, OH: 5 Health Violations — 66/100 (2026)

2026 report: Putnam County, OH scores 66/100 (Grade C). 14 ZIP codes analyzed. 13 EPA violations found. Free report with contaminant data and filter picks.

Richland County, OH: 32 Health Violations — 60/100 (2026)

2026 report: Richland County, OH scores 60/100 (Grade C). 17 ZIP codes analyzed. 60 EPA violations found. Free report with contaminant data and filter p...

Ross County, OH: 1 Health Violation — 54/100 (2026)

2026 report: Ross County, OH scores 54/100 (Grade D). 9 ZIP codes analyzed. 15 EPA violations found. Free report with contaminant data and filter picks.

Sandusky County, OH: 1 Health Violation — 71/100 (2026)

2026 report: Sandusky County, OH scores 71/100 (Grade B). 8 ZIP codes analyzed. 16 EPA violations found. Free report with contaminant data and filter pi...

Scioto County, OH: 4 Violations — 61/100 (2026)

2026 report: Scioto County, OH scores 61/100 (Grade C). 12 ZIP codes analyzed. 4 EPA violations found. Free report with contaminant data and filter picks.

Seneca County, OH: 4 Health Violations — 50/100 (2026)

2026 report: Seneca County, OH scores 50/100 (Grade D). 12 ZIP codes analyzed. 27 EPA violations found. Free report with contaminant data and filter picks.

Shelby County, OH: 2 Health Violations — 55/100 (2026)

2026 report: Shelby County, OH scores 55/100 (Grade C). 14 ZIP codes analyzed. 27 EPA violations found. Free report with contaminant data and filter picks.

Stark County, OH: 11 Health Violations — 55/100 (2026)

2026 report: Stark County, OH scores 55/100 (Grade C). 45 ZIP codes analyzed. 125 EPA violations found. Free report with contaminant data and filter picks.

Summit County, OH: 7 Health Violations — 60/100 (2026)

2026 report: Summit County, OH scores 60/100 (Grade C). 43 ZIP codes analyzed. 164 EPA violations found. Free report with contaminant data and filter pi...

Trumbull County, OH: 7 Health Violations — 70/100 (2026)

2026 report: Trumbull County, OH scores 70/100 (Grade B). 26 ZIP codes analyzed. 51 EPA violations found. Free report with contaminant data and filter p...

Tuscarawas County, OH: 1 Health Violation — 53/100 (2026)

2026 report: Tuscarawas County, OH scores 53/100 (Grade D). 15 ZIP codes analyzed. 28 EPA violations found. Free report with contaminant data and filter...

Union County, OH: 1 Health Violation — 54/100 (2026)

2026 report: Union County, OH scores 54/100 (Grade D). 12 ZIP codes analyzed. 10 EPA violations found. Free report with contaminant data and filter picks.

Van Wert County, OH: 9 Health Violations — 55/100 (2026)

2026 report: Van Wert County, OH scores 55/100 (Grade C). 7 ZIP codes analyzed. 27 EPA violations found. Free report with contaminant data and filter pi...

Vinton County, OH: 1 Health Violation — 63/100 (2026)

2026 report: Vinton County, OH scores 63/100 (Grade C). 7 ZIP codes analyzed. 6 EPA violations found. Free report with contaminant data and filter picks.

Warren County, OH: Lead Above EPA Limits — 56/100 (2026)

2026 report: Warren County, OH scores 56/100 (Grade C). 13 ZIP codes analyzed. 95 EPA violations found. Lead above EPA limits. Free report with contamin...

Washington County, OH: 3 Health Violations — 65/100 (2026)

2026 report: Washington County, OH scores 65/100 (Grade C). 18 ZIP codes analyzed. 22 EPA violations found. Free report with contaminant data and filter...

Wayne County, OH: 23 Violations — 56/100 (2026)

2026 report: Wayne County, OH scores 56/100 (Grade C). 16 ZIP codes analyzed. 23 EPA violations found. Free report with contaminant data and filter picks.

Williams County, OH: 1 Health Violation — 71/100 (2026)

2026 report: Williams County, OH scores 71/100 (Grade B). 9 ZIP codes analyzed. 6 EPA violations found. Free report with contaminant data and filter picks.

Wood County, OH: 3 Health Violations — 66/100 (2026)

2026 report: Wood County, OH scores 66/100 (Grade C). 22 ZIP codes analyzed. 34 EPA violations found. Free report with contaminant data and filter picks.

Wyandot County, OH: 1 Health Violation — 49/100 (2026)

2026 report: Wyandot County, OH scores 49/100 (Grade D). 10 ZIP codes analyzed. 4 EPA violations found. Free report with contaminant data and filter picks.