South Dakota Tap Water Quality

EPA water quality data for 150 community water systems serving 498,866+ people in South Dakota. Click any system to see violations, lead testing results, and a safety grade.

South Dakota relies on the Missouri River system, the Big Sioux Aquifer, and deep Madison and Ogallala formation wells. Water is very hard across most of the state. Naturally occurring uranium and radium are found in some western South Dakota aquifers.

SIOUX FALLS SIOUX FALLS, SD · 216,462 people · Surface Water ABERDEEN ABERDEEN, SD · 27,989 people · Surface Water BROOKINGS MUNICIPAL UTILITIES BROOKINGS, SD · 23,377 people · Groundwater MITCHELL MITCHELL, SD · 15,651 people · Surface Water Purchased HURON HURON, SD · 14,263 people · Surface Water Purchased PIERRE PIERRE, SD · 14,091 people · Surface Water BOX ELDER BOX ELDER, SD · 14,000 people · Groundwater RAPID VALLEY SANITARY DISTRICT RAPID CITY, SD · 11,408 people · Surface Water BRANDON BRANDON, SD · 11,048 people · Groundwater HARRISBURG HARRISBURG, SD · 10,297 people · Groundwater Purchased MADISON MADISON, SD · 6,191 people · Groundwater LINCOLN COUNTY RURAL WATER SYSTEM SIOUX FALLS, SD · 5,965 people · Groundwater Purchased BELLE FOURCHE BELLE FOURCHE, SD · 5,617 people · Groundwater BLACK HAWK WATER USER DISTRICT BLACK HAWK, SD · 4,500 people · Groundwater EAGLE BUTTE EAGLE BUTTE, SD · 4,000 people · Surface Water Purchased DELL RAPIDS DELL RAPIDS, SD · 3,633 people · Groundwater Purchased HARTFORD HARTFORD, SD · 3,396 people · Groundwater Purchased HOT SPRINGS HOT SPRINGS, SD · 3,395 people · Groundwater MOBRIDGE MOBRIDGE, SD · 3,261 people · Surface Water MILBANK MILBANK, SD · 3,200 people · Groundwater CANTON CANTON, SD · 3,066 people · Groundwater NORTH SIOUX CITY NORTH SIOUX CITY, SD · 3,042 people · Groundwater LENNOX LENNOX, SD · 2,571 people · Groundwater Purchased SISSETON SISSETON, SD · 2,479 people · Groundwater CHAMBERLAIN CHAMBERLAIN, SD · 2,473 people · Surface Water FLANDREAU FLANDREAU, SD · 2,372 people · Groundwater Purchased REDFIELD REDFIELD, SD · 2,214 people · Surface Water Purchased TRI-COUNTY RURAL WATER SYSTEM EAGLE BUTTE, SD · 2,190 people · Surface Water ELK POINT ELK POINT, SD · 2,124 people · Groundwater FORT PIERRE FORT PIERRE, SD · 2,115 people · Surface Water Purchased CUSTER CUSTER, SD · 1,919 people · Groundwater PARKSTON PARKSTON, SD · 1,567 people · Surface Water Purchased MARTIN MARTIN, SD · 1,500 people · Groundwater BUTTE-MEADE SWD-BEAN WELL NEWELL, SD · 1,481 people · Groundwater GROTON GROTON, SD · 1,380 people · Surface Water Purchased MILLER MILLER, SD · 1,349 people · Surface Water Purchased FREEMAN FREEMAN, SD · 1,329 people · Surface Water Purchased SALEM SALEM, SD · 1,325 people · Groundwater BALTIC BALTIC, SD · 1,271 people · Groundwater Purchased PLATTE PLATTE, SD · 1,256 people · Surface Water Purchased GARRETSON GARRETSON, SD · 1,228 people · Groundwater Purchased GREGORY GREGORY, SD · 1,221 people · Groundwater CLEAR LAKE CLEAR LAKE, SD · 1,218 people · Groundwater Purchased AURORA AURORA, SD · 1,200 people · Groundwater Purchased COLONIAL PINE HILLS SANITARY DISTRIC RAPID CITY, SD · 1,200 people · Groundwater CHAPEL LANE WATER COMPANY RAPID CITY, SD · 1,200 people · Groundwater GETTYSBURG GETTYSBURG, SD · 1,162 people · Surface Water Purchased DEADWOOD DEADWOOD, SD · 1,156 people · Surface Water Purchased LEMMON LEMMON, SD · 1,156 people · Surface Water Purchased CLARK CLARK, SD · 1,148 people · Groundwater Purchased DE SMET DE SMET, SD · 1,056 people · Groundwater PARKER PARKER, SD · 1,025 people · Groundwater Purchased CENTERVILLE CENTERVILLE, SD · 918 people · Groundwater Purchased MARION MARION, SD · 894 people · Groundwater Purchased HILL CITY HILL CITY, SD · 872 people · Groundwater HOWARD HOWARD, SD · 848 people · Groundwater Purchased ALCESTER ALCESTER, SD · 820 people · Groundwater Purchased EUREKA EUREKA, SD · 813 people · Surface Water Purchased SCOTLAND SCOTLAND, SD · 785 people · Surface Water Purchased PLANKINTON PLANKINTON, SD · 782 people · Surface Water Purchased PHILIP PHILIP, SD · 759 people · Surface Water Purchased ELKTON ELKTON, SD · 755 people · Groundwater Purchased ESTELLINE ESTELLINE, SD · 749 people · Groundwater Purchased EDGEMONT EDGEMONT, SD · 725 people · Groundwater LAKE ANDES LAKE ANDES, SD · 710 people · Surface Water Purchased CASTLEWOOD CASTLEWOOD, SD · 698 people · Groundwater Purchased ARMOUR ARMOUR, SD · 698 people · Surface Water Purchased FAULKTON FAULKTON, SD · 693 people · Surface Water Purchased HIGHMORE HIGHMORE, SD · 682 people · Surface Water Purchased NEW UNDERWOOD NEW UNDERWOOD, SD · 679 people · Groundwater ONIDA ONIDA, SD · 658 people · Surface Water Purchased ALEXANDRIA ALEXANDRIA, SD · 649 people · Surface Water Purchased SELBY SELBY, SD · 645 people · Surface Water Purchased CANISTOTA CANISTOTA, SD · 642 people · Groundwater Purchased COLMAN COLMAN, SD · 634 people · Groundwater Purchased MENNO MENNO, SD · 614 people · Surface Water Purchased AVON AVON, SD · 590 people · Surface Water Purchased NEWELL NEWELL, SD · 583 people · Groundwater HUMBOLDT HUMBOLDT, SD · 579 people · Groundwater Purchased BURKE BURKE, SD · 575 people · Groundwater Purchased KIMBALL KIMBALL, SD · 572 people · Surface Water Purchased MCLAUGHLIN MCLAUGHLIN, SD · 569 people · Surface Water Purchased CORSICA CORSICA, SD · 561 people · Surface Water Purchased LAKE NORDEN LAKE NORDEN, SD · 554 people · Groundwater KADOKA KADOKA, SD · 543 people · Surface Water Purchased BRIDGEWATER BRIDGEWATER, SD · 511 people · Surface Water Purchased DUPREE DUPREE, SD · 494 people · Surface Water Purchased HISEGA MEADOWS WATER INC RAPID CITY, SD · 491 people · GWUDI MURDO MURDO, SD · 488 people · Surface Water Purchased EMERY EMERY, SD · 480 people · Surface Water Purchased JEFFERSON JEFFERSON, SD · 475 people · Groundwater PRESHO PRESHO, SD · 472 people · Surface Water Purchased BRYANT BRYANT, SD · 471 people · Groundwater Purchased BOWDLE BOWDLE, SD · 470 people · Surface Water Purchased MONTROSE MONTROSE, SD · 468 people · Groundwater Purchased MOUNT VERNON MOUNT VERNON, SD · 461 people · Surface Water Purchased LAKESIDE ESTATES ABERDEEN, SD · 460 people · Surface Water Purchased LEOLA LEOLA, SD · 434 people · Surface Water Purchased IRENE IRENE, SD · 422 people · Surface Water Purchased HERMOSA-OLD SYSTEM HERMOSA, SD · 420 people · Groundwater HERREID HERREID, SD · 416 people · Surface Water Purchased BIG STONE CITY BIG STONE CITY, SD · 412 people · Groundwater Purchased TERRY TROJAN WATER DISTRICT BLACK HAWK, SD · 400 people · Groundwater HAYTI HAYTI, SD · 393 people · Groundwater Purchased GAYVILLE GAYVILLE, SD · 392 people · Groundwater Purchased OACOMA OACOMA, SD · 386 people · Surface Water HURLEY HURLEY, SD · 379 people · Groundwater Purchased ROSHOLT ROSHOLT, SD · 379 people · Groundwater FAITH FAITH, SD · 367 people · Surface Water Purchased CHESTER SANITARY DISTRICT EGAN, SD · 363 people · Groundwater Purchased PRAIRIE ACRES LLC RAPID CITY, SD · 350 people · Groundwater BLUNT MILLER, SD · 350 people · Surface Water Purchased BUFFALO BUFFALO, SD · 346 people · Groundwater HOVEN HOVEN, SD · 346 people · Surface Water Purchased COUNTRY VILLAGE PARK ABERDEEN, SD · 340 people · Surface Water Purchased FLORENCE FLORENCE, SD · 337 people · Groundwater Purchased HUDSON HUDSON, SD · 332 people · Groundwater Purchased COLOME COLOME, SD · 323 people · Groundwater ETHAN ETHAN, SD · 320 people · Surface Water Purchased BISON BISON, SD · 310 people · Surface Water Purchased IROQUOIS IROQUOIS, SD · 292 people · Groundwater Purchased BRISTOL BRISTOL, SD · 288 people · Surface Water Purchased LANGFORD LANGFORD, SD · 283 people · Groundwater Purchased BONESTEEL BONESTEEL, SD · 275 people · Groundwater Purchased ROSCOE ROSCOE, SD · 269 people · Surface Water Purchased PUKWANA CHAMBERLAIN, SD · 267 people · Surface Water Purchased CARRIAGE HILLS RAPID CITY, SD · 267 people · Groundwater CHANCELLOR CHANCELLOR, SD · 266 people · Groundwater Purchased KENNEBEC KENNEBEC, SD · 265 people · Surface Water Purchased HENRY HENRY, SD · 256 people · Groundwater Purchased WOODLAND HILLS SANITARY DISTRICT BLACK HAWK, SD · 255 people · Groundwater SAINT ONGE SEWER & WATER CO SPEARFISH, SD · 255 people · Groundwater VALLEY VIEW WATER COMPANY PIEDMONT, SD · 248 people · Groundwater NEW EFFINGTON NEW EFFINGTON, SD · 247 people · Groundwater Purchased EGAN EGAN, SD · 241 people · Groundwater Purchased GARY GARY, SD · 240 people · Groundwater Purchased VALLEY VIEW ESTATES SIOUX FALLS, SD · 230 people · Groundwater POLLOCK POLLOCK, SD · 229 people · Surface Water Purchased FREDERICK FREDERICK, SD · 215 people · Surface Water Purchased ALPENA MILLER, SD · 212 people · Surface Water Purchased NISLAND NISLAND, SD · 206 people · Groundwater PINE HILLS PARK SUMMERSET, SD · 200 people · Groundwater Purchased HECLA HECLA, SD · 200 people · Groundwater Purchased DOLAND DOLAND, SD · 199 people · Surface Water Purchased MELLETTE REDFIELD, SD · 199 people · Surface Water Purchased SAINT LAWRENCE MILLER, SD · 198 people · Surface Water Purchased MISSION HILL GAYVILLE, SD · 190 people · Surface Water Purchased ROSLYN ROSLYN, SD · 181 people · Surface Water Purchased PINE CLIFF ESTATES BLACK HAWK, SD · 180 people · Groundwater RAPID CITY MOBILE HOME PARK BLACK HAWK, SD · 170 people · Groundwater