waterbycounty

South Dakota Water Quality

Drinking water data for all 66 counties.

Avg Water Score

99.8

State Grade

A

Counties with Data

63

of 66 total

All South Dakota Counties

CountyWater Score
Aurora County100.0
Bennett County100.0
Brookings County100.0
Charles Mix County100.0
Clark County100.0
Clay County100.0
Codington County100.0
Davison County100.0
Douglas County100.0
Faulk County100.0
Gregory County100.0
Hand County100.0
Harding County100.0
Hughes County100.0
Hyde County100.0
Jackson County100.0
Jerauld County100.0
Jones County100.0
Kingsbury County100.0
Lake County100.0
Lyman County100.0
Marshall County100.0
McCook County100.0
Minnehaha County100.0
Perkins County100.0
Potter County100.0
Sanborn County100.0
Stanley County100.0
Sully County100.0
Union County100.0
Walworth County100.0
Ziebach County100.0
Beadle County99.9
Dewey County99.9
Grant County99.9
Lawrence County99.9
Lincoln County99.9
Pennington County99.9
Turner County99.9
Yankton County99.9
Butte County99.8
Day County99.8
Edmunds County99.8
Meade County99.8
Brown County99.7
Hutchinson County99.7
Moody County99.7
Bon Homme County99.6
Hanson County99.6
McPherson County99.6
Tripp County99.6
Fall River County99.5
Miner County99.5
Brule County99.4
Corson County99.4
Deuel County99.4
Campbell County99.3
Custer County99.3
Spink County99.2
Mellette County99.1
Haakon County99.0
Hamlin County98.7
Roberts County98.6
Buffalo County—
Oglala Lakota County—
Todd County—

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Data Source

Water quality data sourced from the EPA Safe Drinking Water Information System (SDWIS) via the ECHO enforcement database. Scores reflect compliance history and health-based violation counts.

Disclaimer: This data is informational only. It is not health, legal, or professional advice. For concerns about your specific water supply, contact your local water utility.

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