South Dakota
Water Quality Report
91 Excellent
Average Score
91/100
Water Systems
115
Population
835,993
Violations
96 18 unresolved
Score Distribution
19 A
0 B
0 C
0 D
1 F
Lowest Scoring Water Systems
10
Aberdeen F
SD4600020 Aberdeen, SD 27,989 served
90
Colonial Pine Hills Sanitary Distric A
SD4600263 Rapid City, SD 1,200 served
90
Davison Rural Water System Inc A
SD4601090 Mitchell, SD 3,485 served
91
Oglala Rws Pipeline A
084690480 Pine Ridge, SD 3,562 served
92
Sioux Rural Water System A
SD4600866 Watertown, SD 4,280 served
Counties in South Dakota
Cities in South Dakota
View all 87 cities →Popular City Comparisons in South Dakota
Quickly compare major cities in South Dakota by water quality score and grade.
Frequently Asked Questions
Is tap water in South Dakota safe to drink?
South Dakota has an average WaterQ score of 91/100 across 115 public water systems. Safety can vary by city and system, so check your local report for recent violations and contaminants.
How many water systems are in South Dakota?
WaterQ currently tracks 115 public water systems in South Dakota.
Where can I compare cities in South Dakota?
Use the city list below to open detailed reports, or visit the compare tool to benchmark two cities side-by-side on score, grade, and system coverage.