South Dakota Water Quality Report
Tap water quality data for 1 cities in South Dakota, updated 2026.
US average: 100 ppm
0 of 1 cities violation-free
1 cities tested
1 water systems tracked
Cleanest Tap Water in South Dakota
Cities with the fewest water quality issues
Most Water Quality Issues in South Dakota
Cities with the most violations and concerns
South Dakota Tap Water: What You Need to Know
South Dakota has 1 tracked water utilities serving approximately 228K residents. The average water hardness is 468 ppm (27.4 GPG), classified as Very Hard — above the national average of 100 ppm. Hardness ranges from 468 ppm in Sioux Falls to 468 ppm in Sioux Falls.
In the past 3 years, 1 of 1 cities in South Dakota have recorded water quality violations, totaling 3 violations (0 health-based). All 1 tested cities have lead levels below the EPA action level of 15 ppb.
With very hard water on average, many South Dakota residents may notice mineral buildup on fixtures, dry skin, or stiff-feeling hair. A shower filter for hard water can help reduce chlorine exposure, while a water softener addresses the mineral buildup directly.
Frequently Asked Questions About South Dakota Water
Is tap water safe to drink in South Dakota?
Most tap water in South Dakota meets EPA standards, but 1 cities have recorded violations in the past 3 years (0 health-based). We recommend checking your specific city's report on TapWater.org and considering a home water test.
How hard is the water in South Dakota?
South Dakota's average water hardness is 468 ppm (27.4 GPG), classified as Very Hard. This is above the national average of 100 ppm. Hardness varies significantly by city — use our Water Hardness Calculator to check your specific area.
Which city in South Dakota has the cleanest tap water?
Based on EPA violation data, lead testing, and water quality metrics, Sioux Falls ranks as having the cleanest tap water in South Dakota. It has zero violations in the past 3 years and lead levels well below the EPA action level.
Which city in South Dakota has the most water quality issues?
Sioux Falls currently has the most water quality concerns in South Dakota, with 3 violations in the past 3 years. Residents should check their city's detailed water quality report and consider using a certified water filter.
Where does South Dakota get its water from?
The majority of South Dakota's water systems (0%) use surface water as their primary source. Surface water comes from rivers, lakes, and reservoirs. Each city's specific source can vary — check individual city reports for details.
All 1 Cities
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