Iowa Tap Water Quality

EPA water quality data for 150 community water systems serving 491,597+ people in Iowa. Click any system to see violations, lead testing results, and a safety grade.

Iowa draws drinking water from rivers, shallow alluvial aquifers, and deep bedrock wells. Nitrate contamination from row crop agriculture is the state's most persistent water quality challenge, with Des Moines Water Works historically spending millions on nitrate removal. Atrazine and other herbicides are also commonly detected in surface water sources.

WATERLOO WATER WORKS WATERLOO, IA · 69,504 people · Groundwater CEDAR FALLS MUNICIPAL WATER UTILITIES CEDAR FALLS, IA · 40,713 people · Groundwater IA REGIONAL UTILITIES ASSOC (WAVERLY) NEWTON, IA · 37,820 people · Groundwater RATHBUN REGIONAL WATER ASSN (RATHBUN) CENTERVILLE, IA · 33,000 people · Surface Water MASON CITY WATER DEPARTMENT MASON CITY, IA · 27,338 people · Groundwater BOONE WATER WORKS BOONE, IA · 12,704 people · GWUDI RATHBUN REG WATER ASSN (FT MADISON) CENTERVILLE, IA · 11,840 people · Surface Water Purchased STORM LAKE WATER TREATMENT PLANT STORM LAKE, IA · 11,431 people · Groundwater SPENCER MUNICIPAL WATER UTILITY SPENCER, IA · 11,325 people · Groundwater WAVERLY WATER DEPARTMENT WAVERLY, IA · 10,394 people · Groundwater CARROLL MUNICIPAL WATER SUPPLY CARROLL, IA · 10,184 people · Groundwater RATHBUN REG WTR ASSN (BURLINGTON) CENTERVILLE, IA · 8,375 people · Surface Water Purchased CLEAR LAKE WATER DEPARTMENT CLEAR LAKE, IA · 7,687 people · Groundwater ATLANTIC MUNICIPAL UTILITIES ATLANTIC, IA · 7,252 people · Groundwater IOWA LAKES REGIONAL WATER SPENCER, IA · 6,755 people · Groundwater INDEPENDENCE WATER DEPT INDEPENDENCE, IA · 6,064 people · Groundwater OSCEOLA WATER WORKS OSCEOLA, IA · 5,503 people · Surface Water CENTERVILLE MUNICIPAL WATERWORKS CENTERVILLE, IA · 5,344 people · Surface Water Purchased CHEROKEE WATER SUPPLY - PLANT 1 CHEROKEE, IA · 5,199 people · Groundwater XENIA RWD (BOONE) BOUTON, IA · 4,975 people VINTON MUNICIPAL WATER DEPT VINTON, IA · 4,938 people · Groundwater CAMANCHE WATER SUPPLY CAMANCHE, IA · 4,570 people · Groundwater EVANSDALE WATER WORKS EVANSDALE, IA · 4,561 people · Groundwater SIRWA #3 (OSCEOLA) CRESTON, IA · 4,080 people · Surface Water Purchased WAUKON WATER DEPARTMENT WAUKON, IA · 3,827 people · Groundwater WEST CENTRAL RWA - NISH SYSTEM MANNING, IA · 3,573 people · Groundwater NEW HAMPTON WATER SUPPLY NEW HAMPTON, IA · 3,494 people · Groundwater CHEROKEE RWS - CHEROKEE SUBSYSTEM CHEROKEE, IA · 3,315 people · Groundwater TIPTON WATER SUPPLY TIPTON, IA · 3,149 people · Groundwater MADRID WATER DEPARTMENT MADRID, IA · 3,090 people · GWUDI SIRWA - CORNING CRESTON, IA · 2,585 people · Surface Water Purchased HUDSON WATER SUPPLY HUDSON, IA · 2,546 people · Groundwater Purchased POSTVILLE WATER DEPARTMENT POSTVILLE, IA · 2,513 people · Groundwater WEST BRANCH WATER WORKS WEST BRANCH, IA · 2,509 people · Groundwater JESUP MUNICIPAL WATER SUPPLY JESUP, IA · 2,508 people · Groundwater OGDEN MUNICIPAL UTILITIES OGDEN, IA · 2,419 people · Groundwater BELLE PLAINE WATER DEPT BELLE PLAINE, IA · 2,380 people · Groundwater LA PORTE CITY UTILITIES LAPORTE CITY, IA · 2,284 people · Groundwater ROCKWELL CITY WATER SUPPLY ROCKWELL CITY, IA · 2,250 people · Groundwater GREENFIELD MUNICIPAL UTILITIES GREENFIELD, IA · 2,227 people · Surface Water ALTA MUNICIPAL WATER PLANT ALTA, IA · 2,087 people · Groundwater ATKINS MUNICIPAL WATER WORKS ATKINS, IA · 2,056 people · Groundwater AUDUBON WATER SUPPLY AUDUBON, IA · 2,053 people · Groundwater SUMNER WATER SUPPLY SUMNER, IA · 2,030 people · Groundwater PARKERSBURG WATER SUPPLY PARKERSBURG, IA · 2,019 people · Groundwater DENVER WATER SUPPLY DENVER, IA · 1,919 people · Groundwater DURANT WATER SUPPLY DURANT, IA · 1,871 people · Groundwater GUTTENBERG WATER UTILITY GUTTENBERG, IA · 1,817 people · Groundwater STUART WATER SUPPLY STUART, IA · 1,814 people · Surface Water Purchased CORNING MUNI WATER DEPARTMENT CORNING, IA · 1,735 people · Surface Water LAKE CITY WATER SUPPLY LAKE CITY, IA · 1,731 people · Groundwater WEST CENTRAL RWA-BOYER SYSTEM MANNING, IA · 1,715 people · Groundwater SIRWA #1 (GREENFIELD) CRESTON, IA · 1,712 people · Surface Water Purchased MANSON WATER SUPPLY MANSON, IA · 1,709 people · Groundwater XENIA RWD (MADRID) BOUTON, IA · 1,635 people URBANA WATER SUPPLY URBANA, IA · 1,554 people · Groundwater NASHUA WATER SUPPLY NASHUA, IA · 1,551 people · Groundwater MONONA MUNICIPAL WATER DEPT MONONA, IA · 1,471 people · Groundwater CHEROKEE RWS- MILL CREEK SUBSYSTEM CHEROKEE, IA · 1,451 people · Groundwater MANNING WATER SUPPLY MANNING, IA · 1,392 people · Groundwater COON RAPIDS MUNICIPAL UTILITIES COON RAPIDS, IA · 1,300 people · Groundwater SHELL ROCK MUNI WATER SUPP SHELL ROCK, IA · 1,269 people · Groundwater CLARKSVILLE WATER SUPPLY MARSHALLTOWN, IA · 1,254 people · Groundwater ELKADER MUNI WATER DEPT ELKADER, IA · 1,219 people · Groundwater TRIPOLI WATER SUPPLY TRIPOLI, IA · 1,191 people · Groundwater STRAWBERRY POINT WATER SUPPLY STRAWBERRY POINT, IA · 1,155 people · Groundwater GLIDDEN WATER SUPPLY GLIDDEN, IA · 1,140 people · Groundwater APLINGTON WATER SUPPLY APLINGTON, IA · 1,126 people · Groundwater FAIRBANK WATER SUPPLY FAIRBANK, IA · 1,111 people · Groundwater Purchased MARCUS WATER SUPPLY MARCUS, IA · 1,079 people · Groundwater ROCKWELL WATER SUPPLY ROCKWELL, IA · 1,071 people · Groundwater ELK RUN HEIGHTS WATER SUPPLY ELK RUN HEIGHTS, IA · 1,069 people · Groundwater Purchased CLARENCE WATER SUPPLY MECHANICSVILLE, IA · 1,039 people · Groundwater JANESVILLE WATER SUPPLY JANESVILLE, IA · 1,034 people · Groundwater Purchased MECHANICSVILLE WATER DEPT MECHANICSVILLE, IA · 1,020 people · Groundwater GRISWOLD WATER SUPPLY GRISWOLD, IA · 1,008 people · Groundwater GREENE MUNI WATER SUPPLY GREENE, IA · 994 people · Groundwater FREDERICKSBURG WATER SUPPLY FREDERICKSBURG, IA · 987 people · Groundwater LANSING WATER SUPPLY LANSING, IA · 983 people · Groundwater ANITA MUNICIPAL UTILITIES ANITA, IA · 972 people · Groundwater AURELIA WATER SUPPLY AURELIA, IA · 968 people · Groundwater ALLISON WATER SUPPLY ALLISON, IA · 966 people · Groundwater SHELLSBURG WATER SUPPLY SHELLSBURG, IA · 961 people · Groundwater EDGEWOOD WATER SUPPLY EDGEWOOD, IA · 939 people · Groundwater SIOUX RAPIDS WATER DEPARTMENT SIOUX RAPIDS, IA · 932 people · Groundwater NEWELL WATER TREATMENT PLANT NEWELL, IA · 906 people · Groundwater NEWHALL WATER SUPPLY VAN HORNE, IA · 881 people · Groundwater READLYN WATER SUPPLY READLYN, IA · 845 people · Groundwater DUNKERTON MUNI WATER SUPPLY DUNKERTON, IA · 842 people · Groundwater WINTHROP WATER SUPPLY WINTHROP, IA · 840 people · Groundwater ADAIR MUNICIPAL WATER SUPPLY ADAIR, IA · 809 people · Groundwater LOWDEN WATER SUPPLY LOWDEN, IA · 807 people · Groundwater GILBERTVILLE WATER WORKS GILBERTVILLE, IA · 794 people · Groundwater VAN HORNE WATER WORKS VAN HORNE, IA · 779 people EXIRA WATER DEPT EXIRA, IA · 764 people · Groundwater Purchased GARNAVILLO WATER SUPPLY GARNAVILLO, IA · 763 people · Groundwater MCGREGOR WATER DEPT MCGREGOR, IA · 747 people · Groundwater BLAIRSTOWN WATER SUPPLY BLAIRSTOWN, IA · 738 people · Groundwater VENTURA WATER WORKS VENTURA, IA · 716 people · Groundwater HAZLETON WATER SUPPLY JESUP, IA · 713 people · Groundwater WOODWARD RESOURCE CENTER WOODWARD, IA · 700 people · Surface Water Purchased LAKESIDE WATER SUPPLY LAKESIDE, IA · 700 people · Groundwater Purchased MURRAY WATER WORKS MURRAY, IA · 684 people · Surface Water Purchased ALBERT CITY MUNI WATER SUPPLY STORM LAKE, IA · 677 people · Groundwater POMEROY WATER SUPPLY POMEROY, IA · 671 people · Groundwater FONTANELLE WATER WORKS FONTANELLE, IA · 670 people · Surface Water Purchased MORAVIA PUBLIC WATER SUPPLY MORAVIA, IA · 637 people · Surface Water Purchased STANWOOD WATER SUPPLY STANWOOD, IA · 637 people · Groundwater DUMONT WATER SUPPLY MARSHALLTOWN, IA · 635 people · Groundwater MOULTON WATER DEPARTMENT MOULTON, IA · 607 people · Surface Water Purchased KEYSTONE WATER SUPPLY KEYSTONE, IA · 599 people · Groundwater EVERLY WATER SUPPLY EVERLY, IA · 575 people · Groundwater NEW HARTFORD WATER SUPPLY MARSHALLTOWN, IA · 570 people · Groundwater ARCADIA WATER SUPPLY ARCADIA, IA · 525 people · Groundwater Purchased BREDA WATER SUPPLY BREDA, IA · 502 people · Groundwater NORWAY CITY WATER SUPPLY NORWAY, IA · 466 people NEW ALBIN WATER SUPPLY NEW ALBIN, IA · 432 people · Groundwater LAMONT WATER SUPPLY LAMONT, IA · 429 people · Groundwater MARQUETTE WATER SUPPLY MARQUETTE, IA · 429 people · Groundwater CLOVER RIDGE SUBDIVISION WALFORD, IA · 413 people · Groundwater LAWLER WATER SUPPLY LAWLER, IA · 406 people · Groundwater WEST BRANCH MHP OXFORD, IA · 400 people · Groundwater Purchased THORNTON WATER SUPPLY BELMOND, IA · 400 people · Groundwater PLAINFIELD WATER SUPPLY PLAINFIELD, IA · 393 people · Groundwater CEDAR FALLS MOBILE HOME VILLAGE WAVERLY, IA · 388 people · Groundwater LOHRVILLE WATER SUPPLY NEWELL, IA · 381 people · Groundwater FARNHAMVILLE WATER SUPPLY GILMORE CITY, IA · 379 people · Groundwater PLYMOUTH WATER SUPPLY PLYMOUTH, IA · 378 people · Groundwater ORIENT MUNICIPAL WATER SUPPLY ORIENT, IA · 368 people · Surface Water Purchased MASSENA WATER SUPPLY MASSENA, IA · 364 people · Groundwater LEWIS WATER SUPPLY LEWIS, IA · 357 people · Groundwater CALAMUS WATER SUPPLY CALAMUS, IA · 356 people · Groundwater TEMPLETON WATER SUPPLY TEMPLETON, IA · 352 people · Groundwater Purchased BENNETT WATERWORKS LOWDEN, IA · 347 people · Groundwater GARRISON WATER SUPPLY TRAER, IA · 344 people · Groundwater BRANDON WATER SUPPLY BRANDON, IA · 341 people · Groundwater MYSTIC WATER SUPPLY MYSTIC, IA · 322 people · Surface Water Purchased PETERSON MUNICIPAL WATER SUPPLY PETERSON, IA · 322 people · Groundwater LUANA WATER WORKS LUANA, IA · 301 people · Groundwater TWIN LAKES UTILITIES ROCKWELL CITY, IA · 300 people · Groundwater Purchased CINCINNATI MUNICIPAL WATER CO CINCINNATI, IA · 290 people · Surface Water Purchased KIMBALLTON UTILITIES KIMBALLTON, IA · 287 people · Groundwater FARMERSBURG WATERWORKS MONONA, IA · 276 people · Groundwater CUMBERLAND WATER SUPPLY CUMBERLAND, IA · 266 people · Groundwater QUIMBY WATER SUPPLY QUIMBY, IA · 249 people · Groundwater HALBUR WATER SUPPLY HALBUR, IA · 243 people · Groundwater Purchased COAL VALLEY WATER DISTRICT OGDEN, IA · 240 people · Groundwater Purchased CLEGHORN WATER SUPPLY STORM LAKE, IA · 240 people · Groundwater LENWOOD UTILITIES CEDAR FALLS, IA · 238 people · Groundwater FOSTORIA MUNICIPAL WATER SUPPLY SPENCER, IA · 233 people · Groundwater Purchased