County · Ohio
Seneca County, Ohio: drinking water records
This overview covers 14 ZIP codes and 11 community water systems in Seneca County. It also stands in for 6 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 |
|---|---|---|---|---|---|
| Aqua Ohio - Tiffin OH7400614 | 20,279 | 120 | 0 | 0 | 5.4 ppb |
| Fostoria City OH7400411 | 13,441 | 120 | 0 | 0 | 0 ppb |
| Green Springs Village PWS OH7400512 | 1,592 | 0 | 0 | 7 | 1.8 ppb |
| Attica Village OH7400011 | 1,148 | 0 | 0 | 5 | 5.6 ppb |
| Bettsville Village OH7400112 | 692 | 0 | 0 | 1 | 3.6 ppb |
| Fostoria Mobile Estates OH7400712 | 281 | 0 | 0 | 1 | 0 ppb |
| Evergreen Poplar Village MHP PWS OH7401212 | 128 | 0 | 0 | 1 | 2.9 ppb |
| Brook Park Estates MHP PWS OH7401312 | 75 | 0 | 0 | 2 | 0 ppb |
| Bloomville Village PWS OH7400212 | 956 | 0 | 0 | 0 | 0 ppb |
| Republic Village OH7400812 | 550 | 0 | 0 | 0 | 2.5 ppb |
| Brightstar Fostoria East MHP PWS OH7401412 | 65 | 0 | 0 | 0 | 0 ppb |
ZIP reports in Seneca 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: 44802, 44809, 44841, 44844, 44853, 44861.
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.