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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
101–125 of 152Worthing
SD4600377 · 939 served
Ipswich
SD4600397 · 928 served
Valley Springs
SD4600340 · 925 served
Centerville
SD4600085 · 918 served
Arlington
SD4600385 · 915 served
Wessington Springs
SD4600362 · 895 served
Marion
SD4600201 · 894 served
Whitewood
SD4600368 · 879 served
Hill City
SD4600159 · 872 served
Mina Lake Sanitary District
SD4600501 · 863 served
Howard
SD4600165 · 848 served
Alcester
SD4600004 · 820 served
Viborg
SD4600343 · 814 served
Eureka
SD4600121 · 813 served
Fort Meade Va Center
SD4680002 · 800 served
Scotland
SD4600290 · 785 served
Plankinton
SD4600245 · 782 served
Philip
SD4600238 · 759 served
Elkton
SD4600117 · 755 served
Wonderland Homes
SD4600421 · 750 served
Estelline
SD4600119 · 749 served
Colton
SD4600390 · 738 served
Edgemont
SD4600114 · 725 served
Lake Andes
SD4600185 · 710 served
Wall
SD4600417 · 699 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