Ohio tap water quality
1,122 community water systems serving 10.5 million people.
Data: U.S. EPA · How we read the data · How we check it
35
systems with PFAS above a federal limit
1.5 million
people served by them
331
systems EPA tested for PFAS
3
systems above the lead action level
PFAS: EPA's 2023–2025 testing. Lead: results from the last five years.
Water systems with PFAS above the federal limit
Based on EPA's UCMR 5 results (2023–2025) compared to the April 2024 limits, the way EPA compares them. Systems have until 2029 to comply. Largest first.
- Cincinnati Public Water System800,000 people · Surface water · OhioPFOS above limit
- Montgomery County Water Services 1 Public Water System150,207 people · Purchased surface water · OhioPFOS above limitAlso: PFHxS detected · 2 health-based violations since 2016
- Dayton Public Water System141,407 people · Surface water · OhioPFOS above limitAlso: Lead above action level · PFHxS detected
- Clermont Public Water System133,059 people · Surface water · OhioPFOS above limitAlso: Total trihalomethanes (TTHM) violation
- Western Water Company39,508 people · Purchased surface water · OhioPFOS above limit
- Gallia County Rural Water Association20,995 people · Groundwater · OhioPFOA above limit
- Springboro Public Water System19,263 people · Groundwater · OhioPFOA above limitAlso: PFOS above limit · PFHxS detected
- Marietta City Public Water System18,707 people · Groundwater · OhioPFOA above limitAlso: PFOS above limit
- Wright-Patterson AFB Area A Public Water System16,551 people · Groundwater · OhioPFOS above limitAlso: PFHxS detected
- Indian Hill City Public Water System15,000 people · Groundwater · OhioPFOS above limit
- Loveland City Public Water System12,800 people · Groundwater · OhioPFOS above limit
- Wright-Patterson AFB Area B Public Water System11,034 people · Groundwater · OhioPFOA above limitAlso: PFOS above limit · PFHxS above limit · PFAS Hazard Index above limit
- City of Cambridge10,520 people · Surface water · OhioPFOA above limitAlso: Total trihalomethanes (TTHM) violations
- Trumbull County – Southeast Public Water System9,931 people · Purchased surface water · OhioPFOS above limitAlso: PFOA detected · PFHxS detected
- Bellbrook Water Works9,475 people · Groundwater · OhioPFOS above limitAlso: PFHxS detected · 1 health-based violation since 2016
- Guernsey County Water Dept.8,891 people · Purchased surface water · OhioPFOA above limitAlso: Total trihalomethanes (TTHM) violations · Haloacetic acids (HAA5) violation · Lithium above screening level
- Canfield City Public Water System7,706 people · Purchased surface water · OhioPFOS above limitAlso: PFOA detected · PFHxS detected
- Warren Comm Water & Sewer District Association 27,215 people · Groundwater · OhioPFOA above limit
- Gallipolis Public Water System7,134 people · Groundwater · OhioPFOA above limit
- Martins Ferry Public Water System6,980 people · Groundwater · OhioPFOA above limit
- Milford City Public Water System6,700 people · Groundwater · OhioPFOS above limitAlso: PFOA detected · PFHxS detected
- Leading Creek Conservancy District6,663 people · Groundwater · OhioPFOA above limitAlso: 1 health-based violation since 2016
- Barnesville Water System6,500 people · Surface water · OhioPFOA above limit
- Trumbull County – Howland Township Public Water System6,396 people · Purchased surface water · OhioPFOS above limitAlso: PFOA detected · PFHxS detected
- Newton Falls City Water System6,109 people · Surface water · OhioPFOA above limitAlso: Haloacetic acids (HAA5) violations · PFOS detected
- St. Clairsville, City of Public Water System5,097 people · Surface water · OhioPFOA above limitAlso: Haloacetic acids (HAA5) violation
- McDonald Village Public Water System4,236 people · Purchased surface water · OhioPFOS above limitAlso: PFHxS detected
- Yellow Springs Village Public Water System3,761 people · Groundwater · OhioPFOS above limit
- Jackson/Milton Metro Water District Public Water System3,728 people · Purchased surface water · OhioPFOS above limitAlso: PFOA detected · PFHxS detected
- Shadyside Public Water System3,689 people · Groundwater · OhioPFOA above limitAlso: PFHxS detected · PFNA detected
And 5 more in the full list of Ohio utilities below.
Ohio PFAS report: chart, rankings and data to download →
Largest water systems in Ohio
- Columbus Public Water System1.3 million people · Surface water · OhioNitrate violationAlso: PFOA detected
- Cleveland Public Water System1.3 million people · Surface water · OhioNo PFAS above limits
- Cincinnati Public Water System800,000 people · Surface water · OhioPFOS above limit
- City of Toledo360,000 people · Surface water · OhioNo PFAS above limitsAlso: 1 health-based violation since 2016
- Akron City Public Water System280,000 people · Surface water · OhioHaloacetic acids (HAA5) violationAlso: PFOA detected
- Montgomery County Water Services 1 Public Water System150,207 people · Purchased surface water · OhioPFOS above limitAlso: PFHxS detected · 2 health-based violations since 2016
- Del-Co Water Company, Inc.150,000 people · Surface water · OhioPFOA detected
- Dayton Public Water System141,407 people · Surface water · OhioPFOS above limitAlso: Lead above action level · PFHxS detected
- Clermont Public Water System133,059 people · Surface water · OhioPFOS above limitAlso: Total trihalomethanes (TTHM) violation
- Youngstown City Public Water System130,530 people · Purchased surface water · OhioPFOS detectedAlso: PFHxS detected
- Butler County Water District 2 Public Water System116,572 people · Purchased surface water · OhioPFHxS detected
- Canton Public Water System107,113 people · Groundwater · OhioNo PFAS above limits
- Warren County Water System99,000 people · Groundwater · OhioNo PFAS above limits
- Aqua Ohio – Massillon Public Water System95,636 people · Groundwater · OhioNo PFAS above limits
- Montgomery County Water Services 2 Public Water System83,033 people · Purchased surface water · OhioPFOS detectedAlso: PFHxS detected · 2 health-based violations since 2016
Ohio cities and towns
- Akron
- Athens
- Avon
- Avon Lake
- Beavercreek
- Bowling Green
- Brunswick
- Canton
- Cincinnati
- Cleveland
- Columbus
- Cuyahoga Falls
- Dayton
- Delaware
- Dublin
- Elyria
- Fairborn
- Fairfield
- Findlay
- Gahanna
- Green
- Grove City
- Hamilton
- Huber Heights
- Kent
- Kettering
- Lakewood
- Lancaster
- Lima
- Lorain
- Mansfield
- Marysville
- Mason
- Massillon
- Medina
- Mentor
- Middletown
- Newark
- North Ridgeville
- Pickerington
- Reynoldsburg
- Springfield
- Stow
- Toledo
- Warren
- Westerville
- Wooster
- Xenia
- Youngstown
- Zanesville
Most health-based violations since 2016
- Maysville Regional Water6,540 people · Purchased groundwater · OhioTotal trihalomethanes (TTHM) violationsAlso: PFOA detected
- Brunersburg Water District – Evansport Public Water System268 people · Purchased surface water · OhioTotal trihalomethanes (TTHM) violations
- Hamler Village Water System580 people · Groundwater · OhioTotal trihalomethanes (TTHM) violations
- Brunersburg Water District – Airport Public Water System40 people · Purchased surface water · OhioTotal trihalomethanes (TTHM) violations
- Defiance City Water System16,494 people · Surface water · OhioTotal trihalomethanes (TTHM) violations
- Ayersville Water and Sewer District2,372 people · Purchased surface water · OhioTotal trihalomethanes (TTHM) violations
- Hamden Village Public Water System970 people · Purchased groundwater · OhioHaloacetic acids (HAA5) violationsAlso: Total trihalomethanes (TTHM) violations
- Byesville Water System5,104 people · Groundwater under influence of surface water · OhioTotal trihalomethanes (TTHM) violationsAlso: Lithium above screening level
- West Farmington Village Public Water System908 people · Purchased surface water · OhioTotal trihalomethanes (TTHM) violationsAlso: Haloacetic acids (HAA5) violations
- Nelsonville Public Water System6,656 people · Groundwater · OhioTotal trihalomethanes (TTHM) violationsAlso: Lithium above screening level
- Holgate Village Water System1,150 people · Groundwater · OhioTotal trihalomethanes (TTHM) violations
- Archbold Village Water System5,586 people · Surface water · OhioTotal trihalomethanes (TTHM) violations
- Arcadia Village Public Water System564 people · Purchased surface water · OhioTotal trihalomethanes (TTHM) violations
- Northwestern Water & Sewer District – Co Rd P Public Water System440 people · Purchased surface water · OhioTotal trihalomethanes (TTHM) violations
- Green Springs Village Public Water System1,592 people · Purchased surface water · OhioTotal trihalomethanes (TTHM) violations
All Ohio utilities on this site
Every Ohio system serving 50,000+ people or with PFAS above a federal limit, A to Z. Download all 1,122 systems as CSV.
- Akron City Public Water System
- Aqua Ohio – Massillon Public Water System
- Aqua Ohio – Mentor
- Aqua Ohio – Struthers
- Barnesville Water System
- Bellbrook Water Works
- Bethel Village Public Water System
- Butler County Water District 2 Public Water System
- Caldwell Village Public Water System
- Canfield City Public Water System
- Canton Public Water System
- Cincinnati Public Water System
- City of Cambridge
- City of Toledo
- Clermont Public Water System
- Cleveland Public Water System
- Columbus Public Water System
- Cuyahoga Falls City Public Water System
- Dayton Public Water System
- Dayton VA Bldg 410 Water System
- Del-Co Water Company, Inc.
- Elyria Water Department
- Findlay City Public Water System
- Gallia County Rural Water Association
- Gallipolis Public Water System
- Guernsey County Water Dept.
- Hamilton Public Water System
- Indian Hill City Public Water System
- Jackson/Milton Metro Water District Public Water System
- Lake County West Water Subdistrict
- Lakewood City Public Water System
- Leading Creek Conservancy District
- Lima City Water System
- Lorain City Public Water System
- Lordstown Village Public Water System
- Loveland City Public Water System
- Mansfield City Water System
- Marietta City Public Water System
- Martins Ferry Public Water System
- McDonald Village Public Water System
- Middletown City Public Water System
- Milford City Public Water System
- Montgomery County Water Services 1 Public Water System
- Montgomery County Water Services 2 Public Water System
- Newton Falls City Water System
- Putnam Community Water Association Public Water System
- Rural Lorain County Water Authority
- Shadyside Public Water System
- Springboro Public Water System
- Springfield City Public Water System
- St. Clairsville, City of Public Water System
- Trumbull County – Howland Township Public Water System
- Trumbull County – Southeast Public Water System
- Warren Comm Water & Sewer District Association 2
- Warren County Water System
- Western Water Company
- Wright-Patterson AFB Area A Public Water System
- Wright-Patterson AFB Area B Public Water System
- Yellow Springs Village Public Water System
- Youngstown City Public Water System
Questions
Does Ohio tap water have PFAS?
EPA tested 331 community water systems in Ohio for 29 PFAS between 2023 and 2025. 67 had at least one regulated PFAS detected, and 35 had an entry-point average above a 2024 federal limit. Those 35 systems serve about 1.5 million people (14% of people on community water in Ohio). Systems have until 2029 to meet the limits.
How many Ohio water systems have violations?
286 systems in Ohio had at least one health-based violation since 2016 (755 violations in total). 1,717 violations are currently listed as unaddressed.
Which Ohio water systems are over the lead action level?
3 systems had a lead 90th percentile above the 15 ppb action level in their most recent results from the last five years. Lead depends on each home's pipes, so a test of your own tap is the only way to know your level.
Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.