County · South Dakota
Pennington County, South Dakota: drinking water records
This overview covers 9 ZIP codes and 67 community water systems in Pennington County. It also stands in for 1 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 |
|---|---|---|---|---|---|
| Box Elder SD4600046 | 14,000 | 180 | 0 | 9 | 2 ppb |
| Rapid City SD4600406 | 72,009 | 600 | 1 | 0 | 6 ppb |
| Rapid Valley Sanitary District SD4600274 | 11,408 | 120 | 2 | 0 | 3 ppb |
| Ellsworth Afb SD4680004 | 9,100 | 120 | 0 | 0 | 1 ppb |
| Northdale Sanitary District SD4600514 | 1,075 | 0 | 0 | 1 | 2 ppb |
| Hill City SD4600159 | 872 | 0 | 0 | 2 | 1 ppb |
| Wall SD4600417 | 699 | 245 | 0 | 0 | 1 ppb |
| Prairie Acres LLC SD4600014 | 350 | 0 | 0 | 1 | 8 ppb |
| Prairie Acres North SD4600884 | 288 | 0 | 0 | 1 | 1 ppb |
| Happy Holiday RV Resort SD4600669 | 264 | 0 | 0 | 1 | 1 ppb |
| Sunnyside Mobile Home Park II SD4602001 | 235 | 0 | 0 | 2 | 1 ppb |
| Prairie Acres South SD4600428 | 170 | 0 | 0 | 1 | 1 ppb |
| Ponderosa Mobile Home Ranch SD4600260 | 150 | 0 | 0 | 1 | 4 ppb |
| Prairie Haven Subdivision SD4602322 | 105 | 0 | 0 | 3 | 1 ppb |
| Sheridan Lake Highlands, INC. SD4602285 | 85 | 0 | 0 | 4 | 7 ppb |
| Copper Oaks I SD4602136 | 64 | 0 | 0 | 1 | 1 ppb |
| Whispering Willows SD4602094 | 64 | 0 | 0 | 1 | 3 ppb |
| Owanka Rural Water System SD4602310 | 52 | 0 | 0 | 17 | 2 ppb |
| Lakeside Water Users District SD4602108 | 51 | 0 | 0 | 1 | 1 ppb |
| Cedar Gulch 1 SD4602301 | 45 | 0 | 0 | 3 | 1 ppb |
| Cedar Gulch 2 SD4602295 | 40 | 0 | 0 | 16 | 1 ppb |
| Highland Hills SD4600050 | 38 | 0 | 0 | 1 | 2 ppb |
| Happy Holiday Water Association SD4600420 | 35 | 0 | 0 | 1 | 1 ppb |
| Reynolds Court SD4600160 | 28 | 0 | 0 | 5 | 1 ppb |
| Hidden Valley Water Association INC SD4600269 | 27 | 0 | 0 | 1 | 2 ppb |
ZIP reports in Pennington 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: 57780.
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.