County · Ohio
Ottawa County, Ohio: drinking water records
This overview covers 15 ZIP codes and 10 community water systems in Ottawa County. It also stands in for 8 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 |
|---|---|---|---|---|---|
| Ottawa County Regional Water District OH6205011 | 20,428 | 120 | 3 | 0 | 0 ppb |
| Port Clinton City OH6203211 | 6,500 | 120 | 0 | 0 | 0 ppb |
| Put-In-Bay Village OH6203311 | 5,000 | 0 | 0 | 3 | 10.9 ppb |
| Oak Harbor Village OH6202603 | 4,400 | 120 | 0 | 0 | 0 ppb |
| Genoa Village OH6201003 | 3,110 | 0 | 0 | 1 | 0 ppb |
| Marblehead Village OH6202411 | 865 | 0 | 0 | 1 | 1 ppb |
| Green Valley Mobile Home Park OH6201212 | 82 | 0 | 0 | 1 | 0 ppb |
| Carroll Water and Sewer OH6205111 | 2,288 | 0 | 0 | 0 | 0 ppb |
| Elmore Village OH6200712 | 1,421 | 0 | 0 | 0 | 0 ppb |
| Greenwood Mobile Home Park OH6201312 | 77 | 0 | 0 | 0 | 1.4 ppb |
ZIP reports in Ottawa County
No ZIP report in this county is published yet.
These ZIP codes are covered by this overview because their utility has too little EPA data for a separate page: 43408, 43432, 43433, 43436, 43445, 43446, 43458, 43468.
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.