County · Oklahoma
McClain County, Oklahoma: drinking water records
This overview covers 6 ZIP codes and 12 community water systems in McClain 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 |
|---|---|---|---|---|---|
| Newcastle OK2004704 | 7,900 | 180 | 1 | 0 | 22.5 ppb |
| Purcell OK2004701 | 6,693 | 60 | 0 | 0 | 0 ppb |
| Blanchard OK3004710 | 2,966 | 0 | 0 | 6 | 0 ppb |
| Goldsby Water Auth Trust OK2004707 | 2,000 | 0 | 0 | 1 | 0 ppb |
| Wayne OK2004702 | 688 | 0 | 0 | 2 | 2.0 ppb |
| Washington OK2004703 | 600 | 0 | 0 | 1 | 4.5 ppb |
| Dibble OK3004709 | 550 | 0 | 0 | 2 | 0 ppb |
| Mcclain County Rw & Sd #9 OK3004713 | 250 | 0 | 0 | 1 | 0 ppb |
| Mcclain Co Rwd # 8 OK2004711 | 1,897 | 0 | 0 | 0 | 7.9 ppb |
| Cole OK3004708 | 473 | 0 | 0 | 0 | 0.9 ppb |
| Byars OK2004709 | 275 | 0 | 0 | 0 | 4.9 ppb |
| Whippoorwill Estates OK2004734 | 83 | 0 | 0 | 0 | 0 ppb |
ZIP reports in McClain 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.