Water quality · Ohio
Water quality in Ohio
Of the 6 Ohio ZIPs matched to an EPA SDWIS community water system, none reports a health-based violation in the last 3 years, though 3 carry at least one non-health-based violation. 1 further ZIP has no water-system record on zipradar yet. That is a gap in our records, not a sign that the water is untested. SDWIS reports the system serving the county, never an address-level test, and never private wells.
Last verified 2026-09-24 · methodology
Water quality by ZIP code in Ohio
The largest community water system EPA lists for each ZIP's county, and its health-based violations in the last 3 years.
| ZIP | Largest system | Health-based violations |
|---|---|---|
| 44113ClevelandCuyahoga County | CLEVELAND PUBLIC WATER SYSTEM | None |
| 43215ColumbusFranklin County | COLUMBUS PUBLIC WATER SYSTEM | None |
| 45202CincinnatiHamilton County | CINCINNATI PUBLIC WATER SYSTEM | None |
| 44115Cleveland (Downtown)Cuyahoga County | CLEVELAND PUBLIC WATER SYSTEM | None |
| 44114Cleveland (Downtown East)Cuyahoga County | CLEVELAND PUBLIC WATER SYSTEM | None |
| 45220Cincinnati (Clifton)Hamilton County | CINCINNATI PUBLIC WATER SYSTEM | None |
| 43017Dublin (OH)Franklin County | No record yet |
County-level figures from EPA SDWIS, joined to each ZIP by county. None of them is a measurement at a specific address.
What lands here
Pages show the largest community water system on record for the ZIP's county, its PWSID and population served, and its health-based and total violations in the last 3 years. Lead and copper sampling results are not shown; your utility's annual water quality report (CCR) has them.
Source & refresh
EPA SDWIS. Refreshed quarterly (federal mandate). Primary source →
Ohio top concern
Lead service lines, Great Lakes erosion
Ohio has heavy LCRR obligations in Cleveland, Cincinnati, Columbus, Toledo. Lake Erie shoreline erosion expands FEMA AE zones in some lakefront counties. Tornado exposure on the Indiana/Ohio border.
See Ohio state page for the full state-level rollup across all 12 dimensions.
Read more on water quality
Editorial deep-dives explaining the source data, its limits, and how to read it.
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Plain-English guide to FEMA flood-zone codes (A, AE, AH, V, VE, X, X-shaded). What the 1% and 0.2% annual-chance zones mean for your property and your insurance.
EPA Radon Zones — what 1, 2, and 3 mean and when you should test
EPA classifies every US county into Zone 1 (high), Zone 2 (moderate), or Zone 3 (low) for radon. Plain-English guide to the classifications and at-home testing.
EPA AQI categories explained — what 0–50 Good through 301–500 Hazardous mean
Plain-English guide to the six EPA Air Quality Index categories: 0–50 Good, 51–100 Moderate, 101–150 Unhealthy for Sensitive Groups, 151–200 Unhealthy, 201–300 Very Unhealthy, 301–500 Hazardous — what each level means and who is at risk.
Lead and Copper Rule 2024 — the federal lead-pipe inventory mandate
The 2024 Lead and Copper Rule Revisions (LCRR) require every US community water system to inventory and report lead service lines. Plain-English guide.