Iowa Tap Water Quality: Is It Safe to Drink?

2026 EPA water quality data for 1,078 community water systems serving a combined 3,006,337 people in Iowa. Find your water system to see violations, PFAS results, lead testing, and a safety grade — free.

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.

Find Your Water System in Iowa

Enter your ZIP code to see EPA violations, lead test results, PFAS data, and a safety grade for your water.

📊 Data from EPA’s SDWIS · 🔄 Updated quarterly · 🏛️ 1,078 water systems in Iowa

Showing the 250 largest of 1,078 community water systems in Iowa, by population served. Use the ZIP search above or the city links to find a smaller system.

DES MOINES WATER WORKS DES MOINES, IA · 246,055 people · Surface Water Purchased IOWA-AMERICAN WTR CO-DAVENPORT DAVENPORT, IA · 147,720 people · Surface Water CEDAR RAPIDS WATER DEPARTMENT CEDAR RAPIDS, IA · 142,364 people · GWUDI SIOUX CITY WATER SUPPLY SIOUX CITY, IA · 85,791 people · GWUDI ANKENY, CITY OF ANKENY, IA · 76,207 people · Surface Water Purchased WEST DES MOINES WATER WORKS WEST DES MOINES, IA · 73,959 people · Surface Water Purchased WATERLOO WATER WORKS WATERLOO, IA · 69,504 people · Groundwater IOWA CITY WATER DEPARTMENT IOWA CITY, IA · 68,753 people · Surface Water COUNCIL BLUFFS WATER WORKS COUNCIL BLUFFS, IA · 64,447 people · Surface Water DUBUQUE WATER WORKS DUBUQUE, IA · 59,667 people · Groundwater AMES WATER TREATMENT PLANT AMES, IA · 55,177 people · Groundwater URBANDALE WATER UTILITY URBANDALE, IA · 45,605 people · Surface Water Purchased ISU AMES, IA · 42,000 people · Groundwater Purchased MARION MUNICIPAL WATER DEPT MARION, IA · 41,623 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 WAUKEE WATER SUPPLY WAUKEE, IA · 31,823 people · Surface Water Purchased MARSHALLTOWN WATER WORKS MARSHALLTOWN, IA · 27,591 people · Groundwater MASON CITY WATER DEPARTMENT MASON CITY, IA · 27,338 people · Groundwater UNIVERSITY WATER SYSTEM IOWA CITY, IA · 26,684 people · Surface Water BURLINGTON MUNICIPAL WATERWORKS BURLINGTON, IA · 26,015 people · Surface Water FORT DODGE WATER SUPPLY FORT DODGE, IA · 25,874 people · Groundwater OTTUMWA WATER WORKS OTTUMWA, IA · 25,529 people · Surface Water MUSCATINE POWER & WATER MUSCATINE, IA · 25,516 people · Groundwater IOWA-AMERICAN WTR CO-CLINTON DISTRICT CLINTON, IA · 24,769 people · Groundwater JOHNSTON MUNICIPAL WATER SUPPLY JOHNSTON, IA · 24,064 people · Surface Water Purchased CORALVILLE MUNI WATER SYSTEM CORALVILLE, IA · 22,318 people · Groundwater SIRWA #2 (CRESTON) CRESTON, IA · 20,793 people · Surface Water NORTH LIBERTY WATER SUPPLY NORTH LIBERTY, IA · 20,491 people · Groundwater WARREN WATER DISTRICT INDIANOLA, IA · 20,095 people · Surface Water Purchased ALTOONA WATER SUPPLY ALTOONA, IA · 19,565 people · Groundwater CLIVE WATER DEPARTMENT CLIVE, IA · 19,010 people · Surface Water Purchased WAPELLO RURAL WATER ASSOC. OTTUMWA, IA · 17,263 people · Surface Water Purchased NEWTON WATER SUPPLY NEWTON, IA · 16,518 people · Groundwater INDIANOLA WATER SUPPLY INDIANOLA, IA · 15,833 people · Groundwater GRIMES WATER SUPPLY GRIMES, IA · 15,392 people · Groundwater NORWALK WATER SUPPLY NORWALK, IA · 14,334 people · Surface Water Purchased POWESHIEK WATER ASSOCIATION TAMA, IA · 13,920 people · Groundwater XENIA RWD (DES MOINES) BOUTON, IA · 12,860 people · Surface Water Purchased OSKALOOSA MUNICIPAL WATER DEPT OSKALOOSA, IA · 12,808 people · GWUDI 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 FT MADISON MUNI WATER WORKS FORT MADISON, IA · 11,087 people · Groundwater PELLA WATER WORKS DEPARTMENT PELLA, IA · 11,052 people · Groundwater LEMARS WATER DEPARTMENT LEMARS, IA · 10,606 people · Groundwater WAVERLY WATER DEPARTMENT WAVERLY, IA · 10,394 people · Groundwater CARROLL MUNICIPAL WATER SUPPLY CARROLL, IA · 10,184 people · Groundwater KEOKUK MUNICIPAL WATER WORKS KEOKUK, IA · 9,900 people · Surface Water FAIRFIELD WATER SUPPLY FAIRFIELD, IA · 9,821 people · Groundwater MAHASKA RURAL WATER SYSTEM, INC. OSKALOOSA, IA · 9,818 people · Groundwater GRINNELL WATER DEPARTMENT GRINNELL, IA · 9,564 people · Groundwater BONDURANT MUNI WATER SUPPLY BONDURANT, IA · 9,393 people · Surface Water Purchased DENISON WATER SUPPLY DENISON, IA · 9,381 people · Groundwater MOUNT PLEASANT MUNICIPAL UTILITIES MOUNT PLEASANT, IA · 9,274 people · Groundwater IOWA LAKES REGIONAL WATER - OSGOOD SPENCER, IA · 9,021 people · Surface Water Purchased KNOXVILLE WATER WORKS KNOXVILLE, IA · 8,400 people · Groundwater RATHBUN REG WTR ASSN (BURLINGTON) CENTERVILLE, IA · 8,375 people · Surface Water Purchased SIOUX CENTER MUNICIPAL WATER DEPARTMENT SIOUX CENTER, IA · 8,231 people · Groundwater PERRY MUNICIPAL WATER WORKS PERRY, IA · 7,836 people · Groundwater WEBSTER CITY WATER SUPPLY WEBSTER CITY, IA · 7,825 people · Groundwater CLEAR LAKE WATER DEPARTMENT CLEAR LAKE, IA · 7,687 people · Groundwater DECORAH WATER DEPARTMENT DECORAH, IA · 7,615 people · Groundwater SOUTHEAST POLK RWD DES MOINES, IA · 7,565 people · Surface Water Purchased CRESTON WATER SUPPLY CRESTON, IA · 7,536 people · Surface Water CHARLES CITY WATER SUPPLY CHARLES CITY, IA · 7,446 people · Groundwater WASHINGTON WATER DEPARTMENT WASHINGTON, IA · 7,362 people · Groundwater ATLANTIC MUNICIPAL UTILITIES ATLANTIC, IA · 7,252 people · Groundwater HIAWATHA WATER DEPT HIAWATHA, IA · 7,183 people · Groundwater OSCEOLA RURAL WATER SYSTEM-NORTH MAY CITY, IA · 7,002 people · Groundwater NEVADA WATER SUPPLY NEVADA, IA · 6,925 people · Groundwater IOWA LAKES REGIONAL WATER SPENCER, IA · 6,755 people · Groundwater ELDRIDGE WATER SUPPLY ELDRIDGE, IA · 6,726 people · Groundwater POLK CITY WATER SUPPLY POLK CITY, IA · 6,533 people · Surface Water Purchased ADEL MUNICIPAL WATER WORKS ADEL, IA · 6,461 people · Groundwater ORANGE CITY MUNICIPAL WATER DEPARTMENT ORANGE CITY, IA · 6,267 people · Groundwater SPIRIT LAKE WATERWORKS SPIRIT LAKE, IA · 6,167 people · Surface Water MAQUOKETA MUNICIPAL WATER MAQUOKETA, IA · 6,128 people · Groundwater XENIA RWD (NORTH) BOUTON, IA · 6,122 people · Groundwater INDEPENDENCE WATER DEPT INDEPENDENCE, IA · 6,064 people · Groundwater ASBURY MUNICIPAL WATER SYSTEM ASBURY, IA · 5,943 people · Groundwater OELWEIN MUNICIPAL WATER WORKS OELWEIN, IA · 5,920 people · Groundwater ESTHERVILLE WATER TREATMENT PLANT ESTHERVILLE, IA · 5,904 people · Groundwater MARION CO. RURAL WATER DISTRICT KNOXVILLE, IA · 5,687 people · Groundwater Purchased RED OAK WATER SUPPLY RED OAK, IA · 5,596 people · Groundwater DE WITT WATER SUPPLY DEWITT, IA · 5,514 people · Groundwater SHELDON WATER DEPARTMENT SHELDON, IA · 5,512 people · Groundwater OSCEOLA WATER WORKS OSCEOLA, IA · 5,503 people · Surface Water ALGONA MUNICIPAL UTILITIES ALGONA, IA · 5,487 people · Groundwater GLENWOOD MUNICIPAL UTILITIES GLENWOOD, IA · 5,449 people · Groundwater WINTERSET MUNICIPAL WATERWORKS WINTERSET, IA · 5,428 people · Surface Water SOUTHERN SIOUX COUNTY RURAL WATER IRETON, IA · 5,420 people · Groundwater CENTERVILLE MUNICIPAL WATERWORKS CENTERVILLE, IA · 5,344 people · Surface Water Purchased CHEROKEE WATER SUPPLY - PLANT 1 CHEROKEE, IA · 5,199 people · Groundwater IOWA FALLS WATER DEPARTMENT IOWA FALLS, IA · 5,146 people · Groundwater MANCHESTER WATER SUPPLY MANCHESTER, IA · 5,077 people · Groundwater HARLAN MUNICIPAL UTILITIES HARLAN, IA · 5,067 people · Groundwater SERGEANT BLUFF WATER SUPPLY SERGEANT BLUFF, IA · 5,015 people · Groundwater XENIA RWD (BOONE) BOUTON, IA · 4,975 people VINTON MUNICIPAL WATER DEPT VINTON, IA · 4,938 people · Groundwater SHENANDOAH WATER DEPT SHENANDOAH, IA · 4,925 people · Groundwater HUMBOLDT MUNICIPAL WATER DEPT HUMBOLDT, IA · 4,792 people · GWUDI CAMANCHE WATER SUPPLY CAMANCHE, IA · 4,570 people · Groundwater EVANSDALE WATER WORKS EVANSDALE, IA · 4,561 people · Groundwater MOUNT VERNON WATER SUPPLY MOUNT VERNON, IA · 4,527 people · Groundwater TIFFIN WATER SUPPLY TIFFIN, IA · 4,512 people · Groundwater DYERSVILLE MUNICIPAL WATER CO DYERSVILLE, IA · 4,477 people · Groundwater ANAMOSA MUNICIPAL WATER SUPPLY ANAMOSA, IA · 4,457 people · Groundwater CHARITON MUNICIPAL WATER WORKS CHARITON, IA · 4,381 people · Surface Water Purchased CLARINDA WATER PLANT CLARINDA, IA · 4,372 people · Surface Water HAMPTON MUNI WATER WORKS HAMPTON, IA · 4,337 people · Groundwater FOREST CITY WATER SUPPLY FOREST CITY, IA · 4,285 people · Groundwater HUXLEY WATERWORKS DEPT HUXLEY, IA · 4,244 people · Groundwater JEFFERSON WATER DEPARTMENT JEFFERSON, IA · 4,182 people · Groundwater CARLISLE WATER SUPPLY CARLISLE, IA · 4,170 people · Groundwater REGIONAL WATER AVOCA, IA · 4,132 people · Surface Water Purchased SIRWA #3 (OSCEOLA) CRESTON, IA · 4,080 people · Surface Water Purchased ROCK VALLEY WATER SUPPLY ROCK VALLEY, IA · 4,059 people · Groundwater MONTICELLO WATER SUPPLY MONTICELLO, IA · 4,040 people · Groundwater CRESCO WATERWORKS CRESCO, IA · 3,913 people · Groundwater WEST LIBERTY WATER UTILITY WEST LIBERTY, IA · 3,858 people · Groundwater WAUKON WATER DEPARTMENT WAUKON, IA · 3,827 people · Groundwater CARTER LAKE WATER DISTRICT CARTER LAKE, IA · 3,791 people · Surface Water Purchased EMMETSBURG MUNICIPAL WATER DEPARTMENT EMMETSBURG, IA · 3,733 people · Groundwater WEST BURLINGTON MUNI. WATER SUPPLY WEST BURLINGTON, IA · 3,728 people · Surface Water Purchased ALBIA MUNICIPAL WATER WORKS ALBIA, IA · 3,721 people · Surface Water Purchased OSAGE MUNICIPAL WATER SUPPLY OSAGE, IA · 3,637 people · Groundwater EAGLE GROVE WATER SUPPLY EAGLE GROVE, IA · 3,601 people · Groundwater WEST CENTRAL RWA - NISH SYSTEM MANNING, IA · 3,573 people · Groundwater SOUTHWEST REG WATER DISTRICT (RED OAK) CLARINDA, IA · 3,500 people · Groundwater NEW HAMPTON WATER SUPPLY NEW HAMPTON, IA · 3,494 people · Groundwater XENIA RWD (WOODWARD) BOUTON, IA · 3,465 people · Surface Water Purchased MILFORD MUNICIPAL UTILITIES MILFORD, IA · 3,431 people · Surface Water RURAL WATER SYSTEM #1 HOSPERS, IA · 3,428 people · GWUDI STORY CITY WATER DEPT STORY CITY, IA · 3,357 people · Groundwater WILLIAMSBURG PUBLIC WATER SUPPLY WILLIAMSBURG, IA · 3,345 people · Groundwater CHEROKEE RWS - CHEROKEE SUBSYSTEM CHEROKEE, IA · 3,315 people · Groundwater TIPTON WATER SUPPLY TIPTON, IA · 3,149 people · Groundwater TAMA WATER SUPPLY TAMA, IA · 3,130 people · Groundwater MADRID WATER DEPARTMENT MADRID, IA · 3,090 people · GWUDI GARNER WATER WORKS GARNER, IA · 3,065 people · Groundwater SOLON WATER DEPT SOLON, IA · 3,018 people · Groundwater SOUTHWEST REG WATER DISTRICT (CLARINDA) CLARINDA, IA · 2,942 people · Surface Water Purchased WILTON WATER SUPPLY WILTON, IA · 2,924 people · Groundwater ONAWA MUNICIPAL WATER PLANT ONAWA, IA · 2,906 people · Groundwater LAKE PANORAMA WATER COMPANY PANORA, IA · 2,900 people · Groundwater SIBLEY PUBLIC WATER SUPPLY SIBLEY, IA · 2,860 people · Groundwater Purchased FAIRFAX WATER SUPPLY FAIRFAX, IA · 2,828 people · Groundwater CLARION WATER SUPPLY CLARION, IA · 2,810 people · Groundwater GRUNDY CENTER WATER SUPPLY GRUNDY CENTER, IA · 2,796 people · Groundwater Purchased HAWARDEN WATER SUPPLY HAWARDEN, IA · 2,700 people · Groundwater MISSOURI VALLEY WATER SUPPLY MISSOURI VALLEY, IA · 2,684 people · Groundwater BLOOMFIELD MUNI WATER DEPT BLOOMFIELD, IA · 2,682 people · Surface Water Purchased ELDORA WATER SUPPLY ELDORA, IA · 2,664 people · Groundwater KALONA WATER DEPT KALONA, IA · 2,630 people · Groundwater ROCK RAPIDS MUNICIPAL WATER WORKS ROCK RAPIDS, IA · 2,611 people · Groundwater SIRWA - CORNING CRESTON, IA · 2,585 people · Surface Water Purchased CENTER POINT WATER SUPPLY CENTER POINT, IA · 2,579 people · Groundwater HUDSON WATER SUPPLY HUDSON, IA · 2,546 people · Groundwater Purchased WEST UNION WATER SUPPLY WEST UNION, IA · 2,540 people · Groundwater MITCHELLVILLE WATER SUPPLY MITCHELLVILLE, IA · 2,515 people · Groundwater 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 POWESHIEK WATER ASSOCIATION (IAC) TAMA, IA · 2,490 people · Groundwater BELMOND WATER SUPPLY BELMOND, IA · 2,463 people · Groundwater MARENGO WATER SUPPLY MARENGO, IA · 2,435 people · Groundwater W CENTRAL RWA - DENISON SUBSYS MANNING, IA · 2,428 people · Groundwater Purchased OGDEN MUNICIPAL UTILITIES OGDEN, IA · 2,419 people · Groundwater TOLEDO WATER SUPPLY TOLEDO, IA · 2,399 people · Groundwater PARK VIEW WATER & SANITARY DISTRICT ELDRIDGE, IA · 2,389 people · Groundwater CASCADE MUNICIPAL WATER SUPPLY CASCADE, IA · 2,386 people · Groundwater HULL WATER SUPPLY HULL, IA · 2,384 people · Groundwater Purchased BELLE PLAINE WATER DEPT BELLE PLAINE, IA · 2,380 people · Groundwater BELLEVUE MUNICIPAL UTILITIES BELLEVUE, IA · 2,363 people · Groundwater ELY WATER SUPPLY ELY, IA · 2,328 people · Groundwater COLFAX WATER SUPPLY COLFAX, IA · 2,305 people · Groundwater LA PORTE CITY UTILITIES LAPORTE CITY, IA · 2,284 people · Groundwater PEOSTA WATER SUPPLY PEOSTA, IA · 2,278 people · Groundwater ROCKWELL CITY WATER SUPPLY ROCKWELL CITY, IA · 2,250 people · Groundwater LISBON WATER SUPPLY LISBON, IA · 2,233 people · Groundwater ROCK VALLEY RURAL WATER DISTRICT ROCK VALLEY, IA · 2,230 people · Groundwater GREENFIELD MUNICIPAL UTILITIES GREENFIELD, IA · 2,227 people · Surface Water LAKE MILLS MUNICIPAL WATER DEPT-SOUTH LAKE MILLS, IA · 2,158 people · Groundwater OSCEOLA RURAL WATER SYSTEM-SOUTH MAY CITY, IA · 2,112 people · Groundwater WAPELLO MUNICIPAL WATER WORKS WAPELLO, IA · 2,096 people · Groundwater SAC CITY MUNICIPAL WATER PLANT SAC CITY, IA · 2,093 people · Groundwater ALTA MUNICIPAL WATER PLANT ALTA, IA · 2,087 people · Groundwater NORTHWOOD WATERWORKS NORTHWOOD, IA · 2,072 people · Groundwater BRITT WATER WORKS BRITT, IA · 2,064 people · Groundwater ATKINS MUNICIPAL WATER WORKS ATKINS, IA · 2,056 people · Groundwater AUDUBON WATER SUPPLY AUDUBON, IA · 2,053 people · Groundwater IDA GROVE WATER UTILITY IDA GROVE, IA · 2,051 people · Groundwater SUMNER WATER SUPPLY SUMNER, IA · 2,030 people · Groundwater LAMONI MUNICIPAL UTILITIES LAMONI, IA · 2,029 people · Surface Water EPWORTH WATER SUPPLY EPWORTH, IA · 2,023 people · Groundwater PARKERSBURG WATER SUPPLY PARKERSBURG, IA · 2,019 people · Groundwater MONROE WATER SUPPLY MONROE, IA · 2,007 people · Groundwater Purchased SIGOURNEY MUNI WATER WORKS SIGOURNEY, IA · 2,004 people · Groundwater POWESHIEK WATER ASSOCIATION (CR) TAMA, IA · 2,000 people DENVER WATER SUPPLY DENVER, IA · 1,919 people · Groundwater NEW LONDON MUNIC WATER DEPT NEW LONDON, IA · 1,910 people · Groundwater DALLAS CENTER WATER SUPPLY DALLAS CENTER, IA · 1,901 people · Groundwater POCAHONTAS WATER DEPARTMENT POCAHONTAS, IA · 1,877 people · Groundwater DURANT WATER SUPPLY DURANT, IA · 1,871 people · Groundwater LEON WATER SUPPLY LEON, IA · 1,830 people · Surface Water COLUMBUS JUNCTION WATER SUPPLY COLUMBUS JUNCTION, IA · 1,830 people · Groundwater GUTTENBERG WATER UTILITY GUTTENBERG, IA · 1,817 people · Groundwater STUART WATER SUPPLY STUART, IA · 1,814 people · Surface Water Purchased PARK VIEW VILLAGE ANKENY, IA · 1,800 people · Groundwater Purchased FARLEY WATER SUPPLY FARLEY, IA · 1,766 people · Groundwater LYON-SIOUX RWS-DOON ROCK RAPIDS, IA · 1,765 people · Groundwater PONDEROSA UTILITIES INC. MONTEZUMA, IA · 1,750 people · Groundwater 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 PRAIRIE CITY WATER WORKS PRAIRIE CITY, IA · 1,703 people · Groundwater AVOCA WATER WORKS AVOCA, IA · 1,697 people · Groundwater Purchased MEDIAPOLIS WATER SUPPLY MEDIAPOLIS, IA · 1,688 people · Surface Water Purchased MOVILLE WATER SUPPLY MOVILLE, IA · 1,687 people · Groundwater MOUNT AYR WATER TREATMENT PLANT MOUNT AYR, IA · 1,683 people · Surface Water Purchased REMSEN MUNICIPAL UTILITIES REMSEN, IA · 1,678 people · Groundwater PLEASANTVILLE WATER WORKS PLEASANTVILLE, IA · 1,676 people · Groundwater REINBECK WATER SUPPLY GLADBROOK, IA · 1,662 people · Groundwater GRANGER MUNI WATER SUPPLY GRANGER, IA · 1,654 people · Groundwater XENIA RWD (MADRID) BOUTON, IA · 1,635 people WOODBINE WATER DEPARTMENT WOODBINE, IA · 1,622 people · Groundwater CORYDON WATER SUPPLY CORYDON, IA · 1,610 people · Surface Water Purchased HARTLEY MUNICIPAL WATER DEPARTMENT HARTLEY, IA · 1,605 people · Groundwater ACKLEY MUNICIPAL WATER WORKS MARSHALLTOWN, IA · 1,599 people · Groundwater GUTHRIE CENTER MUNI WATER WORK GUTHRIE CENTER, IA · 1,593 people · Groundwater TRAER MUNICIPAL WATER PLANT TRAER, IA · 1,583 people · Groundwater AKRON, CITY OF AKRON, IA · 1,558 people · Groundwater URBAN BLUFFS - NORTH AVOCA, IA · 1,558 people · Surface Water Purchased URBANA WATER SUPPLY URBANA, IA · 1,554 people · Groundwater NASHUA WATER SUPPLY NASHUA, IA · 1,551 people · Groundwater WALCOTT WATERWORKS WALCOTT, IA · 1,551 people · Groundwater SLATER MUNI WATER DEPT SLATER, IA · 1,548 people MONTEZUMA MUNI WATER SUPPLY MONTEZUMA, IA · 1,545 people · Groundwater LYON-SIOUX RWS-BIG SIOUX ROCK RAPIDS, IA · 1,530 people · Groundwater OAKLAND MUNIC WATER UTILITY OAKLAND, IA · 1,524 people · Groundwater WELLMAN MUNICIPAL WATERWORKS WELLMAN, IA · 1,524 people · Groundwater BEDFORD WATER WORKS BEDFORD, IA · 1,508 people · Surface Water Purchased BROOKLYN WATER DEPARTMENT BROOKLYN, IA · 1,505 people · Groundwater Purchased HOLSTEIN, CITY OF HOLSTEIN, IA · 1,501 people · Groundwater MONONA MUNICIPAL WATER DEPT MONONA, IA · 1,471 people · Groundwater

Iowa Drinking Water: Frequently Asked Questions

Is Iowa tap water safe to drink?

Iowa has 1,078 community water systems regulated by the EPA serving a combined 3,006,337 people. Water quality varies by system — search above to find your specific utility and see its violation history, lead test results, and safety grade.

How many water systems are in Iowa?

There are 1,078 EPA-regulated community water systems in Iowa serving a combined 3,006,337 people. Each system is required to test for over 90 contaminants and publicly report any violations.

Does Iowa have PFAS in its drinking water?

PFAS (forever chemicals) have been detected in water systems across the country, including Iowa. The EPA finalized enforceable PFAS limits in 2024. Search for your specific water system above to see if PFAS were detected and whether levels exceed the new federal limits.

EPA data last updated: 2026-07-12