County · South Dakota
Custer County, South Dakota: drinking water records
This overview covers 4 ZIP codes and 11 community water systems in Custer 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 |
|---|---|---|---|---|---|
| Buffalo Gap SD4600077 | 126 | 0 | 0 | 4 | 2 ppb |
| Hermosa Water Users Association SD4602180 | 108 | 0 | 0 | 2 | 2 ppb |
| Rock Ridge Court SD4602209 | 74 | 0 | 0 | 1 | 3 ppb |
| Fairburn Water Association SD4600877 | 65 | 0 | 0 | 2 | 3 ppb |
| North Hermosa Wud SD4600329 | 40 | 0 | 0 | 1 | 1 ppb |
| Custer SD4600101 | 1,919 | 0 | 0 | 0 | 2 ppb |
| Southern Black Hills Water SD4602309 | 947 | 0 | 0 | 0 | 2 ppb |
| Hermosa-Old System SD4600154 | 420 | 0 | 0 | 0 | 7 ppb |
| Spring Creek Acres SD4602252 | 172 | 0 | 0 | 0 | 1 ppb |
| Heartland Country Ranchettes SD4602235 | 95 | 0 | 0 | 0 | 1 ppb |
| Paramount Point SD4602351 | 40 | 0 | 0 | 0 | 1 ppb |
ZIP reports in Custer 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.