County · South Dakota
Yankton County, South Dakota: drinking water records
This overview covers 7 ZIP codes and 10 community water systems in Yankton 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 |
|---|---|---|---|---|---|
| Yankton SD4600423 | 15,411 | 60 | 0 | 4 | 0 ppb |
| By Water District SD4600865 | 13,320 | 120 | 0 | 2 | 1 ppb |
| Mission Hill SD4600212 | 190 | 0 | 0 | 1 | 1 ppb |
| Timberland Park SD4600412 | 95 | 0 | 0 | 2 | 0 ppb |
| Utica SD4600338 | 65 | 0 | 0 | 3 | 5 ppb |
| Irene SD4600173 | 422 | 0 | 0 | 0 | 1 ppb |
| Gayville SD4600140 | 392 | 0 | 0 | 0 | 1 ppb |
| East Winds Court, INC. SD4602099 | 180 | 0 | 0 | 0 | 0 ppb |
| Volin SD4600347 | 161 | 0 | 0 | 0 | 6 ppb |
| Lesterville SD4600195 | 115 | 0 | 0 | 0 | 0 ppb |
ZIP reports in Yankton 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.