South Dakota drinking water quality
South Dakota has 703 active public water systems serving 978K people. 216 of them, 31%, had at least one EPA violation in the past three years, 43 have an unresolved violation today, and 4 are designated serious violators by the EPA.
Active systems
703
in 65 counties
People served
978K
511 community systems serve 939K
Violations, past 3 years
216
31% of active systems
Serious violators
4
14 systems carry a health flag
Largest counties
All 65 countiesLargest community water systems
All 703 systems| System | Serves | Status |
|---|---|---|
| Sioux Falls Minnehaha County |
216,462 | |
| Rapid City Pennington County |
72,009 | |
| Aberdeen Brown County |
27,989 | |
| Brookings Municipal Utilities Brookings County |
23,377 | |
| Watertown Municipal Utilities Codington County |
23,230 | |
| Web Water Development Association Brown County |
20,750 | |
| Mitchell Davison County |
15,651 | |
| Yankton Yankton County |
15,411 | |
| Huron Beadle County |
14,263 | |
| Pierre Hughes County |
14,091 |
About the South Dakota data
Retrieved from EPA ECHO on Oct 11, 2026.