City Water Quality Rankings in South Dakota
87 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#73
Black Hawk
County, SD
86 B
#74 Flandreau
County, SD
86 B
#75 Piedmont
County, SD
86 B
#76 Winner
County, SD
86 B
#77 Yankton
County, SD
86 B
#78 Springfield
County, SD
85 B
#79 Platte
County, SD
84 B
#80 Rosebud
County, SD
84 B
#81 Baltic
County, SD
77 B
#82 Parkston
County, SD
76 B
#83 Eagle Butte
County, SD
73 C
#84 Gregory
County, SD
70 C
#85 Salem
County, SD
70 C
#86 Aberdeen
County, SD
63 C
#87 Box Elder
County, SD
16 F
Frequently Asked Questions
How are city water quality rankings calculated in South Dakota?
WaterQ city rankings are based on EPA SDWIS data across local public water systems, including contaminant detections, compliance violations, and recency-weighted score signals.
Can I compare two cities in South Dakota?
Yes. Use the city comparison links on this page or open the Compare tool to evaluate two cities side by side on score, grade, and water system coverage.
How often does WaterQ refresh city data?
City-level metrics refresh when new EPA data is processed. Check city pages for latest score and violation context.