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South Dakota Water Quality
152
Utilities in database
0.8M
Residents served
45%
On private wells
2
Key contaminants tracked
Drinking Water in South Dakota
South Dakota has 152 community water systems serving approximately 0.8 million residents. Primary water sources include groundwater. The most commonly reported contaminants include disinfection byproducts, arsenic. 45% of South Dakota residents rely on private wells. DENR holds primary enforcement authority under the Safe Drinking Water Act.
Utilities in South Dakota
51–75 of 152Kingbrook Iii Rural Water System
SD4600874 · 2,888 served
Aurora-brule Rural Water System
SD4600621 · 2,750 served
Kingbrook Ii Rural Water System
SD4600511 · 2,715 served
Hanson Rural Water System
SD4600878 · 2,685 served
Lennox
SD4600193 · 2,571 served
Wr/lj - North Stanley County
SD4602224 · 2,492 served
Sisseton
SD4600310 · 2,479 served
Chamberlain
SD4600086 · 2,473 served
Flandreau
SD4600127 · 2,372 served
Beresford
SD4600386 · 2,359 served
Volga
SD4600346 · 2,340 served
Clark Rural Water System
SD4600881 · 2,325 served
Redfield
SD4600277 · 2,214 served
Tri-county Rural Water System
SD4600112 · 2,190 served
Elk Point
SD4600116 · 2,124 served
Fort Pierre
SD4600130 · 2,115 served
Springfield
SD4600317 · 2,108 served
Custer
SD4600101 · 1,919 served
Webster
SD4600360 · 1,728 served
Parkston
SD4600236 · 1,567 served
Martin
SD4600202 · 1,500 served
Wagner
SD4600348 · 1,490 served
Butte-meade Swd-bean Well
SD4600223 · 1,481 served
Clay Rws/south Union
SD4602185 · 1,447 served
Groton
SD4600147 · 1,380 served
Key Contaminant Concerns in South Dakota
DBPs
When utilities add chlorine to water to kill pathogens, it reacts with dissolved organic matter — leaves, algae, soil — to produce disinfection byproducts (DBPs). Over 600 DBPs have been identified. The EPA regulates two groups: total trihalomethanes (TTHMs, including chloroform) and haloacetic acids (HAA5). DBP levels tend to be highest in surface water systems and in warm months when organic matter is elevated.
Arsenic
Arsenic (As) occurs naturally in rock and soil, dissolving into groundwater through natural weathering processes. Inorganic arsenic — the form found in drinking water — is a known human carcinogen. The western United States has particularly arsenic-rich geological formations, but elevated levels have been found in 48 states. Arsenic is tasteless and odorless.
South Dakota Water FAQs
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Data source: Utility data from EPA SDWIS. 152 active community water systems ingested. CCR contaminant data ingestion in progress.
Last updated: 2026-04-24