Water hardness in South Dakota

Typical South Dakota tap water
124mg/L
7.3gpg
Hard

Population-weighted middle value across 13 South Dakota cities in the dataset

People with hard or very hard water
54%
Hardest
Brookings 500
Softest
Sioux Falls 119

We have hardness numbers for 4 South Dakota cities; 2 of them are county estimates rather than utility figures. Each city page adds the water system's EPA violation record and a softener size for a typical household.

Every South Dakota city on the hardness scale
SoftModerately hardHardVery hard060120180240300360+Sioux Falls: 119 mg/LRapid City: 124 mg/LBrookings: 500 mg/LWatertown: 380 mg/LSioux FallsBrookingsSoftMod.HardVery hard060120180240300360+Sioux Falls: 119 mg/LRapid City: 124 mg/LBrookings: 500 mg/LWatertown: 380 mg/LSioux FallsBrookings

Dot size follows population. Tap a dot for the city page.

0Soft
1Moderately hard
1Hard
2Very hard

All cities in South Dakota

Citymg/LgpgClassDataEPA health violations
Sioux Falls1197.0Moderately hardUtility report0
Rapid City1247.2HardUtility report0
Brookings50029.2Very hardCounty estimate1
Watertown38022.2Very hardCounty estimate1

Questions

Is South Dakota water hard?

The typical South Dakota resident gets about 124 mg/L (7.3 gpg), which is hard. About 54% of people in the cities we track have hard or very hard water.

Which city in South Dakota has the hardest water?

Among 4 cities with pages here, Brookings is highest at 500 mg/L.

Which city in South Dakota has the softest water?

Sioux Falls, at 119 mg/L.

Other states

Hardness data: TapWaterData US Water Hardness, CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.