South Dakota County Water Quality Reports

Aurora County, SD: 1 Violation — 61/100 (2026)

2026 report: Aurora County, SD scores 61/100 (Grade C). 4 ZIP codes analyzed. 1 EPA violation found. Free report with contaminant data and filter picks.

Beadle County, SD: 3 Health Violations — 57/100 (2026)

2026 report: Beadle County, SD scores 57/100 (Grade C). 7 ZIP codes analyzed. 7 EPA violations found. Free report with contaminant data and filter picks.

Bennett County, SD: 3 Violations — 80/100 (2026)

2026 report: Bennett County, SD scores 80/100 (Grade B). 1 ZIP code analyzed. 3 EPA violations found. Free report with contaminant data and filter picks.

Bon Homme County, SD: 2 Health Violations — 60/100 (2026)

2026 report: Bon Homme County, SD scores 60/100 (Grade C). 6 ZIP codes analyzed. 8 EPA violations found. Free report with contaminant data and filter pi...

Brookings County, SD: 1 Health Violation — 58/100 (2026)

2026 report: Brookings County, SD scores 58/100 (Grade C). 7 ZIP codes analyzed. 5 EPA violations found. Free report with contaminant data and filter pi...

Brown County, SD: 14 Health Violations — 60/100 (2026)

2026 report: Brown County, SD scores 60/100 (Grade C). 14 ZIP codes analyzed. 24 EPA violations found. Free report with contaminant data and filter picks.

Brule County, SD: 2 Health Violations — 59/100 (2026)

2026 report: Brule County, SD scores 59/100 (Grade C). 5 ZIP codes analyzed. 3 EPA violations found. Free report with contaminant data and filter picks.

Butte County, SD: 1 Health Violation — 70/100 (2026)

2026 report: Butte County, SD scores 70/100 (Grade B). 6 ZIP codes analyzed. 16 EPA violations found. Free report with contaminant data and filter picks.

Campbell County, SD: 1 Health Violation — 56/100 (2026)

2026 report: Campbell County, SD scores 56/100 (Grade C). 4 ZIP codes analyzed. 3 EPA violations found. Free report with contaminant data and filter picks.

Charles Mix County, SD: 3 Violations — 56/100 (2026)

2026 report: Charles Mix County, SD scores 56/100 (Grade C). 6 ZIP codes analyzed. 3 EPA violations found. Free report with contaminant data and filter ...

Clark County, SD: 15 Violations — 58/100 (2026)

2026 report: Clark County, SD scores 58/100 (Grade C). 7 ZIP codes analyzed. 15 EPA violations found. Free report with contaminant data and filter picks.

Clay County, SD: 1 Health Violation — 63/100 (2026)

2026 report: Clay County, SD scores 63/100 (Grade C). 3 ZIP codes analyzed. 1 EPA violation found. Free report with contaminant data and filter picks.

Codington County, SD: 1 Health Violation — 55/100 (2026)

2026 report: Codington County, SD scores 55/100 (Grade C). 5 ZIP codes analyzed. 22 EPA violations found. Free report with contaminant data and filter p...

Corson County, SD: 1 Health Violation — 47/100 (2026)

2026 report: Corson County, SD scores 47/100 (Grade D). 4 ZIP codes analyzed. 10 EPA violations found. Free report with contaminant data and filter picks.

Custer County, SD: 4 Health Violations — 72/100 (2026)

2026 report: Custer County, SD scores 72/100 (Grade B). 5 ZIP codes analyzed. 20 EPA violations found. Free report with contaminant data and filter picks.

Davison County, SD: 1 Violation — 67/100 (2026)

2026 report: Davison County, SD scores 67/100 (Grade C). 2 ZIP codes analyzed. 1 EPA violation found. Free report with contaminant data and filter picks.

Day County, SD: 1 Health Violation — 59/100 (2026)

2026 report: Day County, SD scores 59/100 (Grade C). 8 ZIP codes analyzed. 4 EPA violations found. Free report with contaminant data and filter picks.

Deuel County, SD: 1 Health Violation — 48/100 (2026)

2026 report: Deuel County, SD scores 48/100 (Grade D). 5 ZIP codes analyzed. 1 EPA violation found. Free report with contaminant data and filter picks.

Dewey County, SD: 1 Health Violation — 60/100 (2026)

2026 report: Dewey County, SD scores 60/100 (Grade C). 13 ZIP codes analyzed. 5 EPA violations found. Free report with contaminant data and filter picks.

Douglas County, SD: 5 Violations — 60/100 (2026)

2026 report: Douglas County, SD scores 60/100 (Grade C). 4 ZIP codes analyzed. 5 EPA violations found. Free report with contaminant data and filter picks.

Edmunds County, SD: 1 Health Violation — 67/100 (2026)

2026 report: Edmunds County, SD scores 67/100 (Grade C). 4 ZIP codes analyzed. 5 EPA violations found. Free report with contaminant data and filter picks.

Fall River County, SD: 3 Health Violations — 71/100 (2026)

2026 report: Fall River County, SD scores 71/100 (Grade B). 6 ZIP codes analyzed. 22 EPA violations found. Free report with contaminant data and filter ...

Faulk County, SD: 2 Violations — 60/100 (2026)

2026 report: Faulk County, SD scores 60/100 (Grade C). 4 ZIP codes analyzed. 2 EPA violations found. Free report with contaminant data and filter picks.

Grant County, SD: 2 Violations — 48/100 (2026)

2026 report: Grant County, SD scores 48/100 (Grade D). 8 ZIP codes analyzed. 2 EPA violations found. Free report with contaminant data and filter picks.

Gregory County, SD Water Safety: 70/100 (2026)

2026 report: Gregory County, SD scores 70/100 (Grade B). 7 ZIP codes analyzed. No EPA violations. Free report with contaminant data and filter picks.

Haakon County, SD: 1 Health Violation — 65/100 (2026)

2026 report: Haakon County, SD scores 65/100 (Grade C). 5 ZIP codes analyzed. 4 EPA violations found. Free report with contaminant data and filter picks.

Hamlin County, SD: 4 Health Violations — 57/100 (2026)

2026 report: Hamlin County, SD scores 57/100 (Grade C). 10 ZIP codes analyzed. 5 EPA violations found. Free report with contaminant data and filter picks.

Hand County, SD: High Radon Risk — 70/100 (2026)

2026 report: Hand County, SD scores 70/100 (Grade B). 1 ZIP code analyzed. No EPA violations. Free report with contaminant data and filter picks.

Hanson County, SD: 1 Health Violation — 58/100 (2026)

2026 report: Hanson County, SD scores 58/100 (Grade C). 3 ZIP codes analyzed. 1 EPA violation found. Free report with contaminant data and filter picks.

Harding County, SD Water Safety: 60/100 (2026)

2026 report: Harding County, SD scores 60/100 (Grade C). 6 ZIP codes analyzed. No EPA violations. Free report with contaminant data and filter picks.

Hughes County, SD: High Radon Risk — 60/100 (2026)

2026 report: Hughes County, SD scores 60/100 (Grade C). 1 ZIP code analyzed. No EPA violations. Free report with contaminant data and filter picks.

Hutchinson County, SD: 1 Health Violation — 56/100 (2026)

2026 report: Hutchinson County, SD scores 56/100 (Grade C). 7 ZIP codes analyzed. 4 EPA violations found. Free report with contaminant data and filter p...

Hyde County, SD: 1 Violation — 46/100 (2026)

2026 report: Hyde County, SD scores 46/100 (Grade D). 5 ZIP codes analyzed. 1 EPA violation found. Free report with contaminant data and filter picks.

Jackson County, SD Water Safety: 68/100 (2026)

2026 report: Jackson County, SD scores 68/100 (Grade C). 2 ZIP codes analyzed. No EPA violations. Free report with contaminant data and filter picks.

Jerauld County, SD: 2 Violations — 52/100 (2026)

2026 report: Jerauld County, SD scores 52/100 (Grade D). 3 ZIP codes analyzed. 2 EPA violations found. Free report with contaminant data and filter picks.

Jones County, SD Water Safety: 63/100 (2026)

2026 report: Jones County, SD scores 63/100 (Grade C). 3 ZIP codes analyzed. No EPA violations. Free report with contaminant data and filter picks.

Kingsbury County, SD: High Radon Risk — 62/100 (2026)

2026 report: Kingsbury County, SD scores 62/100 (Grade C). 4 ZIP codes analyzed. No EPA violations. Free report with contaminant data and filter picks.

Lake County, SD: High Radon Risk — 47/100 (2026)

2026 report: Lake County, SD scores 47/100 (Grade D). 4 ZIP codes analyzed. No EPA violations. Free report with contaminant data and filter picks.

Lawrence County, SD: 2 Health Violations — 75/100 (2026)

2026 report: Lawrence County, SD scores 75/100 (Grade B). 6 ZIP codes analyzed. 10 EPA violations found. Free report with contaminant data and filter pi...

Lincoln County, SD: 2 Health Violations — 61/100 (2026)

2026 report: Lincoln County, SD scores 61/100 (Grade C). 10 ZIP codes analyzed. 7 EPA violations found. Free report with contaminant data and filter picks.

Lyman County, SD: 1 Violation — 50/100 (2026)

2026 report: Lyman County, SD scores 50/100 (Grade D). 7 ZIP codes analyzed. 1 EPA violation found. Free report with contaminant data and filter picks.

Marshall County, SD: 7 Violations — 61/100 (2026)

2026 report: Marshall County, SD scores 61/100 (Grade C). 7 ZIP codes analyzed. 7 EPA violations found. Free report with contaminant data and filter picks.

McCook County, SD: Lead Above EPA Limits — 60/100 (2026)

2026 report: McCook County, SD scores 60/100 (Grade C). 7 ZIP codes analyzed. 2 EPA violations found. Lead above EPA limits. Free report with contaminan...

McPherson County, SD: 1 Health Violation — 56/100 (2026)

2026 report: McPherson County, SD scores 56/100 (Grade C). 3 ZIP codes analyzed. 5 EPA violations found. Free report with contaminant data and filter pi...

Meade County, SD: 3 Health Violations — 78/100 (2026)

2026 report: Meade County, SD scores 78/100 (Grade B). 8 ZIP codes analyzed. 9 EPA violations found. Free report with contaminant data and filter picks.

Mellette County, SD: 1 Health Violation — 58/100 (2026)

2026 report: Mellette County, SD scores 58/100 (Grade C). 8 ZIP codes analyzed. 2 EPA violations found. Free report with contaminant data and filter picks.

Miner County, SD: 1 Health Violation — 54/100 (2026)

2026 report: Miner County, SD scores 54/100 (Grade D). 4 ZIP codes analyzed. 6 EPA violations found. Free report with contaminant data and filter picks.

Minnehaha County, SD: 18 Health Violations — 61/100 (2026)

2026 report: Minnehaha County, SD scores 61/100 (Grade C). 31 ZIP codes analyzed. 41 EPA violations found. Free report with contaminant data and filter ...

Moody County, SD: 1 Health Violation — 60/100 (2026)

2026 report: Moody County, SD scores 60/100 (Grade C). 6 ZIP codes analyzed. 7 EPA violations found. Free report with contaminant data and filter picks.

Oglala Lakota County, SD: High Radon Risk — 88/100 (2026)

2026 report: Oglala Lakota County, SD scores 88/100 (Grade A). 1 ZIP code analyzed. No EPA violations. Free report with contaminant data and filter picks.

Pennington County, SD: 7 Health Violations — 69/100 (2026)

2026 report: Pennington County, SD scores 69/100 (Grade C). 17 ZIP codes analyzed. 12 EPA violations found. Free report with contaminant data and filter...

Perkins County, SD: 3 Violations — 50/100 (2026)

2026 report: Perkins County, SD scores 50/100 (Grade D). 5 ZIP codes analyzed. 3 EPA violations found. Free report with contaminant data and filter picks.

Potter County, SD: 9 Violations — 55/100 (2026)

2026 report: Potter County, SD scores 55/100 (Grade C). 5 ZIP codes analyzed. 9 EPA violations found. Free report with contaminant data and filter picks.

Roberts County, SD: 6 Health Violations — 60/100 (2026)

2026 report: Roberts County, SD scores 60/100 (Grade C). 9 ZIP codes analyzed. 18 EPA violations found. Free report with contaminant data and filter picks.

Sanborn County, SD: 4 Violations — 52/100 (2026)

2026 report: Sanborn County, SD scores 52/100 (Grade D). 6 ZIP codes analyzed. 4 EPA violations found. Free report with contaminant data and filter picks.

Shannon County, SD Water Safety: 53/100 (2026)

2026 report: Shannon County, SD scores 53/100 (Grade D). 8 ZIP codes analyzed. No EPA violations. Free report with contaminant data and filter picks.

Spink County, SD: 2 Violations — 54/100 (2026)

2026 report: Spink County, SD scores 54/100 (Grade D). 12 ZIP codes analyzed. 2 EPA violations found. Free report with contaminant data and filter picks.

Stanley County, SD: High Radon Risk — 60/100 (2026)

2026 report: Stanley County, SD scores 60/100 (Grade C). 1 ZIP code analyzed. No EPA violations. Free report with contaminant data and filter picks.

Sully County, SD: High Radon Risk — 52/100 (2026)

2026 report: Sully County, SD scores 52/100 (Grade D). 3 ZIP codes analyzed. No EPA violations. Free report with contaminant data and filter picks.

Tripp County, SD: 1 Health Violation — 60/100 (2026)

2026 report: Tripp County, SD scores 60/100 (Grade C). 4 ZIP codes analyzed. 2 EPA violations found. Free report with contaminant data and filter picks.

Turner County, SD: 1 Health Violation — 66/100 (2026)

2026 report: Turner County, SD scores 66/100 (Grade C). 5 ZIP codes analyzed. 3 EPA violations found. Free report with contaminant data and filter picks.

Union County, SD: 3 Violations — 62/100 (2026)

2026 report: Union County, SD scores 62/100 (Grade C). 4 ZIP codes analyzed. 3 EPA violations found. Free report with contaminant data and filter picks.

Walworth County, SD: 5 Violations — 59/100 (2026)

2026 report: Walworth County, SD scores 59/100 (Grade C). 4 ZIP codes analyzed. 5 EPA violations found. Free report with contaminant data and filter picks.

Yankton County, SD: 3 Health Violations — 61/100 (2026)

2026 report: Yankton County, SD scores 61/100 (Grade C). 8 ZIP codes analyzed. 15 EPA violations found. Free report with contaminant data and filter picks.

Ziebach County, SD: 1 Violation — 67/100 (2026)

2026 report: Ziebach County, SD scores 67/100 (Grade C). 2 ZIP codes analyzed. 1 EPA violation found. Free report with contaminant data and filter picks.