Identify the PWSID
Ohio Drinking Water Watch can be searched by system number, name, county, type and primary source. The PWSID keeps similarly named providers from being confused.
Ohio water data
How to Research Ohio Water Quality
Use the exact provider, public-water-system ID, source, sample point, date and report before drawing a conclusion.
Quick answer
There is no single statewide tap-water profile.
Ohio includes Lake Erie surface-water systems, Ohio River systems, reservoir systems, buried-valley aquifers, municipal wells, purchased-water districts and private wells. The correct evidence depends on the address.
Read the annual report
Community systems publish Consumer Confidence Reports describing source water, detected contaminants and compliance information.
Test the tap when needed
Utility-wide data do not describe a private well, service line, fixture, water heater, building plumbing or installed treatment system.
Ohio EPA datasets
PFAS and cyanotoxin records require sample-point context.
The Ohio EPA PFAS service includes PWSID, system, treatment plant, sample point, sample date, analyte, result, unit and raw-versus-finished-water information. The HAB service includes treatment-plant locations and raw- and finished-water cyanotoxin results.
PFAS research checklist
- Confirm the PWSID and treatment plant
- Identify the analyte and unit
- Read the sample date and reporting limit
- Determine whether the point is raw or finished water
- Compare with current utility and EPA records
Cyanotoxin research checklist
- Identify the source-water body
- Separate raw-water and finished-water results
- Use the most recent sample and advisory information
- Do not treat a recreational bloom as a finished tap-water result
- Review the utility's current water-quality page
Source-water regions
Ohio source-water patterns change the questions.
Lake Erie systems
Review treatment-plant reports, regional supplier relationships and cyanotoxin monitoring. Purchased-water communities may have their own distribution-system PWSID.
Cleveland region →Ohio River systems
Use the exact utility and treatment plant. River monitoring, raw water and finished drinking water are not interchangeable.
Cincinnati region →Buried-valley aquifers
Groundwater systems in southwest and west-central Ohio may use wellfields, source-protection programs and different treatment than surface-water systems.
Miami Valley →Primary research links
Ohio and federal drinking-water sources
- Ohio Drinking Water Watch
Search official public-water-system records by system number, name, county and source type. - Ohio EPA PFAS sampling service
Ohio treatment-plant sampling records distinguish systems, sample points, raw water and finished water. - Ohio EPA cyanotoxin monitoring service
Ohio monitoring for raw and finished water at participating public water systems. - EPA local drinking-water information
Federal guidance for identifying the supplier and annual Consumer Confidence Report. - EPA UCMR data finder
Unregulated-contaminant monitoring searchable by system, state, analyte and source-water type. - EWG Ohio utility directory
Independent comparison source; use alongside official utility and regulatory records.
Limit: database records can lag current utility operations. Always compare the record with the newest report and current service account.