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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
76–100 of 152Crooks
SD4600391 · 1,362 served
Miller
SD4600211 · 1,349 served
Freeman
SD4600134 · 1,329 served
Salem
SD4600288 · 1,325 served
Baltic
SD4600034 · 1,271 served
Platte
SD4600246 · 1,256 served
Lakota Tech High School
SD4600332 · 1,250 served
Garretson
SD4600138 · 1,228 served
Gregory
SD4600145 · 1,221 served
Clear Lake
SD4600092 · 1,218 served
Britton
SD4600388 · 1,215 served
Colonial Pine Hills Sanitary Distric
SD4600263 · 1,200 served
Aurora
SD4600058 · 1,200 served
Chapel Lane Water Company
SD4600264 · 1,200 served
Wr/lj - Creighton Project
SD4602156 · 1,170 served
Gettysburg
SD4600142 · 1,162 served
Deadwood
SD4600104 · 1,156 served
Lemmon
SD4600192 · 1,156 served
Clark
SD4600091 · 1,148 served
Northdale Sanitary District
SD4600514 · 1,075 served
Fall River Wud
SD4602201 · 1,057 served
De Smet
SD4600059 · 1,056 served
Parker
SD4600235 · 1,025 served
Tyndall
SD4600337 · 1,012 served
Piedmont
SD4602303 · 971 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