County · Ohio
Franklin County, Ohio: drinking water records
This overview covers 44 ZIP codes and 26 community water systems in Franklin 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 |
|---|---|---|---|---|---|
| Sanitary District #4 OH2501003 | 8,575 | 120 | 6 | 1 | 1.3 ppb |
| Timberlake Water System OH2501812 | 1,600 | 60 | 0 | 1 | 1.8 ppb |
| Columbus Public Water System OH2504412 | 1,305,946 | 300 | 6 | 0 | 1.2 ppb |
| Westerville City PWS OH2503411 | 39,000 | 120 | 1 | 0 | 1.5 ppb |
| Reynoldsburg City PWS OH2503203 | 37,847 | 180 | 1 | 0 | 2.1 ppb |
| Gahanna City PWS OH2501303 | 33,258 | 120 | 0 | 0 | 0.5 ppb |
| Bexley City PWS OH2500103 | 14,250 | 240 | 5 | 0 | 0 ppb |
| Jefferson Water and Sewer District PWS OH2504012 | 11,294 | 60 | 0 | 0 | 2 ppb |
| Canal Winchester City PWS OH2500312 | 9,286 | 60 | 0 | 0 | 2.1 ppb |
| Aqua Ohio - Blacklick OH2502412 | 7,100 | 60 | 0 | 0 | 0 ppb |
| Aqua Ohio - Huber Ridge PWS OH2502512 | 5,393 | 60 | 0 | 0 | 0 ppb |
| Aqua Ohio - Lake Darby OH2502612 | 3,562 | 60 | 0 | 0 | 0 ppb |
| Groveport PWS OH2501512 | 3,229 | 60 | 0 | 0 | 1.5 ppb |
| Obetz Village PWS OH2502212 | 3,167 | 0 | 0 | 1 | 1.2 ppb |
| Lockbourne Village PWS OH2503903 | 275 | 0 | 0 | 1 | 0 ppb |
| Leonard Park PWS OH2570717 | 266 | 0 | 0 | 1 | 0 ppb |
| Community Gardens MHP OH2500512 | 74 | 0 | 0 | 1 | 6.2 ppb |
| Aqua Ohio - Worthington Hills PWS OH2502812 | 2,500 | 0 | 0 | 0 | 0 ppb |
| Obetz Satellite 6 PWS OH2566512 | 1,317 | 0 | 0 | 0 | 0 ppb |
| Obetz Satellite 2 PWS OH2554603 | 1,267 | 0 | 0 | 0 | 0 ppb |
| Aqua Ohio - Timberbrook Pw OH2502712 | 865 | 0 | 0 | 0 | 2.7 ppb |
| Enchanted Acres MHP OH2500712 | 750 | 0 | 0 | 0 | 1 ppb |
| Ponderosa Estates MHP OH2503012 | 216 | 0 | 0 | 0 | 0 ppb |
| Obetz Satellite 1 PWS OH2504303 | 151 | 0 | 0 | 0 | 0.7 ppb |
| Galloway Water System PWS OH2570758 | 350 | 0 | 0 | 0 | not reported |
ZIP reports in Franklin 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.