Confirm the street-address ZIP
Do not use a PO Box to infer the provider. A postal ZIP can cross city, county and utility boundaries.
Independent comparison source
How to Use EWG's Tap Water Database in Ohio
EWG can help locate possible utilities and compare published results, but a ZIP result does not establish the provider at a specific address.
Quick answer
The links can be static; the destination data remain dynamic.
Ohio city pages contain ordinary fixed outbound links to EWG ZIP results and direct utility pages. EWG maintains the information at those destinations and can update the data period, utility mapping, methodology or page structure.
Match the utility name
Compare the EWG result with the current bill, PWSID and newest Consumer Confidence Report.
Use official evidence too
Compare EWG's independent analysis with Ohio Drinking Water Watch, Ohio EPA records, EPA UCMR data and property-specific testing.
What the database cannot establish
Utility data are not a household tap test.
- One ZIP can contain several systems and private wells
- Utility averages can cover multiple treatment plants or reporting years
- Distribution plumbing and building plumbing can change tap conditions
- Health guidelines and enforceable limits are not interchangeable
- A non-detect in one sample is not a permanent guarantee
Commercial-use safeguard
The site links instead of copying EWG's database.
OhioWaterFiltration.com does not mirror EWG's tables, use EWG branding, imply endorsement, or build a copied contaminant database. The city pages provide ordinary outbound links and publish local claims from official utility and regulatory sources.
Open EWG's Ohio directoryUse alongside official sources
Verify the public water system before interpreting results.
- 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.