State Hub
South Dakota Water Quality
152
Utilities in database
0.8M
Residents served
0
With open violations
46
PFAS monitored
Quick Answer
South Dakota public drinking water is served by 152 EPA-tracked water systems, providing service to approximately 0.8 million residents through public utilities. No open health-based violations are currently recorded across tracked systems in the EPA federal database. 46 systems have official PFAS monitoring records from the EPA UCMR 5 program (2023–2025). About 45% of SD residents use private wells, which fall outside federal utility compliance monitoring.
No open health-based violations are currently recorded in the EPA SDWIS database for South Dakota's tracked water systems. Always verify with your utility's Consumer Confidence Report for annual test results.
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.
Safest Large Utilities
South Dakota systems with no open health violations serving 10,000+ residents.
Utilities in South Dakota
26–50 of 152Madison
SD4600199 · 6,191 served
Lincoln County Rural Water System
SD4600304 · 5,965 served
Big Sioux Community Water System
SD4600429 · 5,800 served
Brown-day-marshall Rws
SD4600882 · 5,673 served
Belle Fourche
SD4600037 · 5,617 served
South Lincoln Rural Water System
SD4600870 · 5,250 served
Grant-roberts Rural Water System
SD4600864 · 5,050 served
Tripp County Water User District
SD4600520 · 4,860 served
Clay Rural Water System
SD4600626 · 4,780 served
Wr/lj - Mni Wiconi
SD4602223 · 4,720 served
Black Hawk Water User District
SD4600043 · 4,500 served
Sioux Rural Water System
SD4600866 · 4,280 served
Tm Rural Water District
SD4600999 · 4,250 served
Eagle Butte
SD4600010 · 4,000 served
Dakota Dunes Cid
SD4602093 · 3,700 served
Dell Rapids
SD4600105 · 3,633 served
Davison Rural Water System Inc
SD4601090 · 3,485 served
Hartford
SD4600150 · 3,396 served
Hot Springs
SD4600163 · 3,395 served
Mobridge
SD4600215 · 3,261 served
Milbank
SD4600207 · 3,200 served
Canton
SD4600082 · 3,066 served
North Sioux City
SD4600226 · 3,042 served
Lead
SD4602164 · 2,982 served
Winner
SD4600373 · 2,921 served
Key Contaminant Concerns in South Dakota
These contaminants appear most frequently in South Dakota utility records or pose elevated risk in this region based on EPA data.
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.
EPA limit: 80 µg/L (TTHMs) / 60 µg/L (HAA5)
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.
EPA limit: 10 ppb
City Water Reports in South Dakota
Tap water quality pages for South Dakota cities — violations, PFAS records, utility profiles, and official source links.
Independent Water Testing
Find a certified lab in South Dakota
Utility compliance records show what water systems report to the EPA. An independent test from a certified laboratory confirms what's actually in your tap water. South Dakota labs can test for PFAS, lead, nitrates, bacteria, and dozens of other contaminants.
Explore Water Quality in South Dakota
Madison
Violation history, PFAS records, and official source links
Lincoln County Rural Water System
Violation history, PFAS records, and official source links
Big Sioux Community Water System
Violation history, PFAS records, and official source links
PFAS monitoring records — South Dakota
46 water systems in South Dakota with EPA UCMR 5 records
Lead in South Dakota drinking water
State-specific lead data, violation utilities, and testing guidance
PFAS in South Dakota drinking water
State-specific PFAS data, MCL context, and treatment options
Certified water testing labs in South Dakota
Labs certified for PFAS (EPA 533/537.1), lead, and bacteria testing
Water treatment options
Reverse osmosis, activated carbon, and filtration guides with cost ranges
Data sources and methodology
How WaterUtilityReport.com sources and validates official EPA data
Common Questions About South Dakota Drinking Water
Does South Dakota drinking water have PFAS?
46 South Dakota water systems have EPA UCMR 5 PFAS monitoring records (2023–2025)
Which South Dakota water utilities have open violations?
Browse South Dakota utility compliance records and violation history
How do I test my water in South Dakota?
State-certified labs for PFAS (EPA 533/537.1), lead, nitrate, and bacteria testing
What treatment removes PFAS from SD tap water?
Reverse osmosis removes PFAS, lead, arsenic, and nitrates — cost, maintenance, and NSF certification explained
What do South Dakota PFAS records tell me about my water?
EPA limits, health context, and what UCMR 5 detection above MRL means for your water
How is South Dakota water quality data sourced here?
EPA SDWIS violations, UCMR 5 PFAS records, and CCR data — sources, accuracy notes, and limitations
South Dakota Water FAQs
Data sources: Utility compliance and violation data from EPA SDWIS (Safe Drinking Water Information System). PFAS monitoring records from EPA UCMR 5 (Unregulated Contaminant Monitoring Rule 5, 2023–2025). Contaminant data from EPA and ATSDR public references. This page summarizes public records — it is not a compliance determination. Methodology →
Last updated: 2026-04-24