County · South Dakota
Douglas County, South Dakota: drinking water records
This overview covers 5 ZIP codes and 8 community water systems in Douglas 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 |
|---|---|---|---|---|---|
| By Water District SD4600865 | 13,320 | 120 | 0 | 2 | 1 ppb |
| Delmont SD4600106 | 153 | 0 | 0 | 1 | 1 ppb |
| Davison Rural Water System INC SD4601090 | 3,485 | 0 | 0 | 0 | 1 ppb |
| Aurora-Brule Rural Water System SD4600621 | 2,750 | 0 | 0 | 0 | 4 ppb |
| Armour SD4600028 | 698 | 0 | 0 | 0 | 4 ppb |
| Corsica SD4600097 | 561 | 0 | 0 | 0 | 5 ppb |
| Clearfield Colony SD4602020 | 120 | 0 | 0 | 0 | 0 ppb |
| Greenwood Colony SD4602022 | 85 | 0 | 0 | 0 | 0 ppb |
ZIP reports in Douglas 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.