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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
126–150 of 152Armour
SD4600028 · 698 served
Castlewood
SD4600002 · 698 served
Faulkton
SD4600125 · 693 served
Highmore
SD4600158 · 682 served
New Underwood
SD4600224 · 679 served
Onida
SD4600233 · 658 served
Sun Valley Development
SD4602270 · 650 served
Alexandria
SD4600062 · 649 served
Selby
SD4600291 · 645 served
Canistota
SD4600080 · 642 served
Colman
SD4600093 · 634 served
Woonsocket
SD4600376 · 618 served
Menno
SD4600205 · 614 served
Clark Rural Water-kampeska
SD4602277 · 602 served
Avon
SD4600031 · 590 served
Lake Preston
SD4600398 · 589 served
Newell
SD4600222 · 583 served
Humboldt
SD4600167 · 579 served
Burke
SD4600079 · 575 served
Tripp
SD4600334 · 575 served
Kimball
SD4600184 · 572 served
Mclaughlin
SD4600198 · 569 served
Corsica
SD4600097 · 561 served
Lake Norden
SD4600187 · 554 served
Kadoka
SD4600181 · 543 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