State rankings

South Dakota water-system rankings

Community water systems in South Dakota ranked by PurityRadar safety score — from EPA violations, enforcement, and PFAS data.

Lowest-scoring systems in South Dakota

Ranked lowest score first. Population shown for context.

1 RAPID VALLEY SANITARY DISTRICT RAPID CITY, SD · ~11,408 served 81 2 SICANGU MNI WICONI RURAL WATER SYSTEM ROSEBUD, SD · ~5,610 served 85 3 ROSEBUD RURAL WATER SYSTEM ROSEBUD, SD · ~5,500 served 85 4 ST. FRANCIS ROSEBUD, SD · ~2,450 served 85 5 RAPID CITY RAPID CITY, SD · ~72,009 served 99 6 LEAD-DEADWOOD SANITARY DISTRICT DEADWOOD, SD 100 7 LEWIS AND CLARK REGIONAL WATER SYSTE VERMILLION, SD 100 8 SIOUX FALLS SIOUX FALLS, SD · ~216,462 served 100 9 ABERDEEN ABERDEEN, SD · ~27,989 served 100 10 BROOKINGS MUNICIPAL UTILITIES BROOKINGS, SD · ~23,377 served 100 11 WATERTOWN MUNICIPAL UTILITIES WATERTOWN, SD · ~23,230 served 100 12 WEB WATER DEVELOPMENT ASSOCIATION ABERDEEN, SD · ~20,750 served 100 13 MITCHELL MITCHELL, SD · ~15,651 served 100 14 YANKTON YANKTON, SD · ~15,411 served 100 15 HURON HURON, SD · ~14,263 served 100 16 PIERRE PIERRE, SD · ~14,091 served 100 17 BOX ELDER BOX ELDER, SD · ~14,000 served 100 18 MINNEHAHA COMMUNITY WATER CORP DELL RAPIDS, SD · ~13,435 served 100 19 BY WATER DISTRICT TABOR, SD · ~13,320 served 100 20 SPEARFISH SPEARFISH, SD · ~12,193 served 100 21 MID-DAKOTA RURAL WATER MILLER, SD · ~11,833 served 100 22 VERMILLION VERMILLION, SD · ~11,695 served 100 23 BRANDON BRANDON, SD · ~11,048 served 100 24 HARRISBURG HARRISBURG, SD · ~10,297 served 100 25 ELLSWORTH AFB ELLSWORTH AFB, SD · ~9,100 served 100

Highest-scoring large systems in South Dakota

Systems serving 10,000+ people with the best scores.

1 SIOUX FALLS SIOUX FALLS, SD · ~216,462 served 100 2 ABERDEEN ABERDEEN, SD · ~27,989 served 100 3 BROOKINGS MUNICIPAL UTILITIES BROOKINGS, SD · ~23,377 served 100 4 WATERTOWN MUNICIPAL UTILITIES WATERTOWN, SD · ~23,230 served 100 5 WEB WATER DEVELOPMENT ASSOCIATION ABERDEEN, SD · ~20,750 served 100 6 MITCHELL MITCHELL, SD · ~15,651 served 100 7 YANKTON YANKTON, SD · ~15,411 served 100 8 HURON HURON, SD · ~14,263 served 100
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Scores reflect EPA public records (violations, enforcement, PFAS), are system-level, and can’t account for your home’s plumbing. See the methodology.