County · Ohio
Hamilton County, Ohio: drinking water records
This overview covers 54 ZIP codes and 11 community water systems in Hamilton County. It also stands in for 0 ZIP codes whose utility has too little EPA data for a page of its own.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems with the most complete records
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Lockland Village PWS OH3101212 | 3,486 | 60 | 0 | 1 | 0 ppb |
| Cincinnati Public Water System OH3102612 | 750,200 | 180 | 3 | 0 | 2.1 ppb |
| Norwood City PWS OH3101703 | 19,870 | 120 | 0 | 0 | 1.7 ppb |
| Indian Hill City PWS OH3101112 | 15,000 | 60 | 5 | 0 | 1.7 ppb |
| Harrison City PWS OH3100812 | 11,600 | 60 | 0 | 0 | 0.7 ppb |
| Wyoming City PWS OH3102212 | 9,700 | 60 | 0 | 0 | 0.5 ppb |
| Reading City PWS OH3101812 | 9,506 | 120 | 1 | 0 | 1.9 ppb |
| Cleves Village PWS OH3100512 | 6,000 | 60 | 0 | 0 | 0 ppb |
| Addyston Village PWS OH3100012 | 900 | 0 | 0 | 1 | 0 ppb |
| Glendale Village PWS OH3100712 | 2,500 | 0 | 0 | 0 | 0.7 ppb |
| Twin Rivers Water Corporation OH3102303 | 245 | 0 | 0 | 0 | 3 ppb |
ZIP reports in Hamilton County
No ZIP report in this county is published yet.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.