U.S. water systems

Iowa Water Systems

Iowa

1,768 community water systems on record — 1,080 active, 688 inactive.

Every active community water system nationwide must produce a Consumer Confidence Report under the EPA's revised rule, effective for reports due July 1, 2027.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 2026. This is a record-keeping and public-information tool — it does not replace Iowa’s official records. Always confirm current status with Iowa before making decisions based on this information.

Counties in Iowa

Adair County (8)Adams County (8)Allamakee County (14)Appanoose County (9)Audubon County (6)Benton County (23)Black Hawk County (30)Boone County (19)Bremer County (20)Buchanan County (20)Buena Vista County (14)Butler County (11)Calhoun County (12)Carroll County (20)Cass County (9)Cedar County (15)Cerro Gordo County (18)Cherokee County (12)Chickasaw County (12)Clarke County (7)Clay County (12)Clayton County (23)Clinton County (23)Crawford County (17)Dallas County (33)Davis County (5)Decatur County (7)Delaware County (11)Des Moines County (21)Dickinson County (17)Dubuque County (72)Emmet County (14)Fayette County (16)Floyd County (9)Franklin County (9)Fremont County (9)Greene County (10)Grundy County (11)Guthrie County (13)Hamilton County (11)Hancock County (9)Hardin County (17)Harrison County (15)Henry County (17)Howard County (7)Humboldt County (10)Ida County (8)Iowa County (24)Jackson County (14)Jasper County (17)Jefferson County (13)Johnson County (115)Jones County (21)Keokuk County (13)Kossuth County (20)Lee County (30)Linn County (84)Louisa County (11)Lucas County (5)Lyon County (12)Madison County (11)Mahaska County (10)Marion County (25)Marshall County (22)Mills County (12)Mitchell County (5)Monona County (10)Monroe County (4)Montgomery County (5)Muscatine County (39)O'Brien County (8)Osceola County (7)Page County (12)Palo Alto County (9)Plymouth County (11)Pocahontas County (9)Polk County (62)Pottawattamie County (23)Poweshiek County (15)Ringgold County (8)Sac County (9)Scott County (87)Shelby County (14)Sioux County (17)Story County (37)Tama County (15)Taylor County (9)Union County (7)Van Buren County (11)Wapello County (15)Warren County (21)Washington County (19)Wayne County (6)Webster County (35)Winnebago County (13)Winneshiek County (18)Woodbury County (23)Worth County (7)Wright County (15)

All community water systems in Iowa

System name	Mailing city	Population served	Status
DES MOINES WATER WORKS	DES MOINES	246,055	Active
IOWA-AMERICAN WTR CO-DAVENPORT	DAVENPORT	147,720	Active
CEDAR RAPIDS WATER DEPARTMENT	CEDAR RAPIDS	142,364	Active
SIOUX CITY WATER SUPPLY	SIOUX CITY	85,791	Active
ANKENY, CITY OF	ANKENY	76,207	Active
WEST DES MOINES WATER WORKS	WEST DES MOINES	73,959	Active
WATERLOO WATER WORKS	WATERLOO	69,504	Active
IOWA CITY WATER DEPARTMENT	IOWA CITY	68,753	Active
COUNCIL BLUFFS WATER WORKS	COUNCIL BLUFFS	64,447	Active
DUBUQUE WATER WORKS	DUBUQUE	59,667	Active
AMES WATER TREATMENT PLANT	AMES	55,177	Active
URBANDALE WATER UTILITY	URBANDALE	45,605	Active
ISU	AMES	42,000	Active
MARION MUNICIPAL WATER DEPT	MARION	41,623	Active
CEDAR FALLS MUNICIPAL WATER UTILITIES	CEDAR FALLS	40,713	Active
IA REGIONAL UTILITIES ASSOC (WAVERLY)	NEWTON	37,820	Active
BETTENDORF WATER SUPPLY	BETTENDORF	33,215	Inactive
RATHBUN REGIONAL WATER ASSN (RATHBUN)	CENTERVILLE	33,000	Active
WAUKEE WATER SUPPLY	WAUKEE	31,823	Active
CENTRAL IA WATER ASSN (NEWTON)	NEWTON	28,250	Inactive
MARSHALLTOWN WATER WORKS	MARSHALLTOWN	27,680	Active
MASON CITY WATER DEPARTMENT	MASON CITY	27,338	Active
UNIVERSITY WATER SYSTEM	IOWA CITY	26,684	Active
BURLINGTON MUNICIPAL WATERWORKS	BURLINGTON	26,015	Active
FORT DODGE WATER SUPPLY	FORT DODGE	25,874	Active
OTTUMWA WATER WORKS	OTTUMWA	25,529	Active
MUSCATINE POWER & WATER	MUSCATINE	25,516	Active
JOHNSTON MUNICIPAL WATER SUPPLY	JOHNSTON	24,897	Active
IOWA-AMERICAN WTR CO-CLINTON DISTRICT	CLINTON	24,769	Active
NORTH LIBERTY WATER SUPPLY	NORTH LIBERTY	23,276	Active
CORALVILLE MUNI WATER SYSTEM	CORALVILLE	22,318	Active
SIRWA #2 (CRESTON)	CRESTON	20,793	Active
CLIVE WATER DEPARTMENT	CLIVE	20,277	Active
WARREN WATER DISTRICT	INDIANOLA	20,095	Active
ALTOONA WATER SUPPLY	ALTOONA	19,565	Active
GRIMES WATER SUPPLY	GRIMES	17,809	Active
WAPELLO RURAL WATER ASSOC.	OTTUMWA	17,263	Active
NEWTON WATER SUPPLY	NEWTON	16,518	Active
INDIANOLA WATER SUPPLY	INDIANOLA	15,833	Active
NORWALK WATER SUPPLY	NORWALK	14,334	Active
POWESHIEK WATER ASSOCIATION	TAMA	13,920	Active
XENIA RWD (DES MOINES)	BOUTON	12,860	Active
OSKALOOSA MUNICIPAL WATER DEPT	OSKALOOSA	12,808	Active
BOONE WATER WORKS	BOONE	12,704	Active
RATHBUN REG WATER ASSN (FT MADISON)	CENTERVILLE	11,840	Active
STORM LAKE WATER TREATMENT PLANT	STORM LAKE	11,431	Active
SPENCER MUNICIPAL WATER UTILITY	SPENCER	11,325	Active
FT MADISON MUNI WATER WORKS	FORT MADISON	11,087	Active
PLEASANT HILL WATER DEPARTMENT	PLEASANT HILL	11,079	Inactive
PELLA WATER WORKS DEPARTMENT	PELLA	11,052	Active
LEMARS WATER DEPARTMENT	LEMARS	10,606	Active
WAVERLY WATER DEPARTMENT	WAVERLY	10,394	Active
CARROLL MUNICIPAL WATER SUPPLY	CARROLL	10,184	Active
KEOKUK MUNICIPAL WATER WORKS	KEOKUK	9,900	Active
FAIRFIELD WATER SUPPLY	FAIRFIELD	9,821	Active
MAHASKA RURAL WATER SYSTEM, INC.	OSKALOOSA	9,818	Active
GRINNELL WATER DEPARTMENT	GRINNELL	9,564	Active
BONDURANT MUNI WATER SUPPLY	BONDURANT	9,393	Active
DENISON WATER SUPPLY	DENISON	9,381	Active
MOUNT PLEASANT MUNICIPAL UTILITIES	MOUNT PLEASANT	9,274	Active
IOWA LAKES REGIONAL WATER - OSGOOD	SPENCER	9,021	Active
KNOXVILLE WATER WORKS	KNOXVILLE	8,400	Active
RATHBUN REG WTR ASSN (BURLINGTON)	CENTERVILLE	8,375	Active
SIOUX CENTER MUNICIPAL WATER DEPARTMENT	SIOUX CENTER	8,231	Active
PERRY MUNICIPAL WATER WORKS	PERRY	7,836	Active
WEBSTER CITY WATER SUPPLY	WEBSTER CITY	7,825	Active
CLEAR LAKE WATER DEPARTMENT	CLEAR LAKE	7,687	Active
DECORAH WATER DEPARTMENT	DECORAH	7,615	Active
TIFFIN WATER SUPPLY	TIFFIN	7,577	Active
SOUTHEAST POLK RWD	DES MOINES	7,565	Active
CRESTON WATER SUPPLY	CRESTON	7,536	Active
CHARLES CITY WATER SUPPLY	CHARLES CITY	7,446	Active
WASHINGTON WATER DEPARTMENT	WASHINGTON	7,362	Active
ATLANTIC MUNICIPAL UTILITIES	ATLANTIC	7,252	Active
HIAWATHA WATER DEPT	HIAWATHA	7,183	Active
OSCEOLA RURAL WATER SYSTEM-NORTH	MAY CITY	7,002	Active
NEVADA WATER SUPPLY	NEVADA	6,925	Active
IOWA LAKES REGIONAL WATER	SPENCER	6,755	Active
ELDRIDGE WATER SUPPLY	ELDRIDGE	6,726	Active
POLK CITY WATER SUPPLY	POLK CITY	6,533	Active
ADEL MUNICIPAL WATER WORKS	ADEL	6,461	Active
ORANGE CITY MUNICIPAL WATER DEPARTMENT	ORANGE CITY	6,267	Active
SPIRIT LAKE WATERWORKS	SPIRIT LAKE	6,167	Active
MAQUOKETA MUNICIPAL WATER	MAQUOKETA	6,128	Active
XENIA RWD (NORTH)	BOUTON	6,122	Active
INDEPENDENCE WATER DEPT	INDEPENDENCE	6,064	Active
IOWA TEST 3	SLOAN	6,000	Inactive
ASBURY MUNICIPAL WATER SYSTEM	ASBURY	5,943	Active
OELWEIN MUNICIPAL WATER WORKS	OELWEIN	5,920	Active
ESTHERVILLE WATER TREATMENT PLANT	ESTHERVILLE	5,904	Active
MARION CO. RURAL WATER DISTRICT	KNOXVILLE	5,687	Active
RED OAK WATER SUPPLY	RED OAK	5,596	Active
DE WITT WATER SUPPLY	DEWITT	5,514	Active
SHELDON WATER DEPARTMENT	SHELDON	5,512	Active
OSCEOLA WATER WORKS	OSCEOLA	5,503	Active
ALGONA MUNICIPAL UTILITIES	ALGONA	5,487	Active
GLENWOOD MUNICIPAL UTILITIES	GLENWOOD	5,449	Active
WINTERSET MUNICIPAL WATERWORKS	WINTERSET	5,428	Active
SOUTHERN SIOUX COUNTY RURAL WATER	IRETON	5,420	Active
CENTERVILLE MUNICIPAL WATERWORKS	CENTERVILLE	5,344	Active
CHEROKEE WATER SUPPLY - PLANT 1	CHEROKEE	5,199	Active
IOWA FALLS WATER DEPARTMENT	IOWA FALLS	5,146	Active
MANCHESTER WATER SUPPLY	MANCHESTER	5,077	Active
HARLAN MUNICIPAL UTILITIES	HARLAN	5,067	Active
SERGEANT BLUFF WATER SUPPLY	SERGEANT BLUFF	5,015	Active
XENIA RWD (BOONE)	BOUTON	4,975	Active
VINTON MUNICIPAL WATER DEPT	VINTON	4,938	Active
SHENANDOAH WATER DEPT	SHENANDOAH	4,925	Active
WINDSOR HEIGHTS WATER DEPT.	WINDSOR HEIGHTS	4,891	Inactive
HUMBOLDT MUNICIPAL WATER DEPT	HUMBOLDT	4,792	Active
CAMANCHE WATER SUPPLY	CAMANCHE	4,570	Active
EVANSDALE WATER WORKS	EVANSDALE	4,561	Active
MOUNT VERNON WATER SUPPLY	MOUNT VERNON	4,527	Active
DYERSVILLE MUNICIPAL WATER CO	DYERSVILLE	4,477	Active
ANAMOSA MUNICIPAL WATER SUPPLY	ANAMOSA	4,457	Active
CHARITON MUNICIPAL WATER WORKS	CHARITON	4,381	Active
CLARINDA WATER PLANT	CLARINDA	4,372	Active
HAMPTON MUNI WATER WORKS	HAMPTON	4,337	Active
FOREST CITY WATER SUPPLY	FOREST CITY	4,285	Active
HUXLEY WATERWORKS DEPT	HUXLEY	4,244	Active
JEFFERSON WATER DEPARTMENT	JEFFERSON	4,182	Active
CARLISLE WATER SUPPLY	CARLISLE	4,170	Active
REGIONAL WATER	AVOCA	4,132	Active
SIRWA #3 (OSCEOLA)	CRESTON	4,080	Active
ROCK VALLEY WATER SUPPLY	ROCK VALLEY	4,059	Active
MONTICELLO WATER SUPPLY	MONTICELLO	4,040	Active
WEST LIBERTY WATER UTILITY	WEST LIBERTY	3,938	Active
CRESCO WATERWORKS	CRESCO	3,913	Active
WAUKON WATER DEPARTMENT	WAUKON	3,827	Active
CARTER LAKE WATER DISTRICT	CARTER LAKE	3,791	Active
EMMETSBURG MUNICIPAL WATER DEPARTMENT	EMMETSBURG	3,733	Active
WEST BURLINGTON MUNI. WATER SUPPLY	WEST BURLINGTON	3,728	Active
ALBIA MUNICIPAL WATER WORKS	ALBIA	3,721	Active
OSAGE MUNICIPAL WATER SUPPLY	OSAGE	3,637	Active
EAGLE GROVE WATER SUPPLY	EAGLE GROVE	3,601	Active
WEST CENTRAL RWA - NISH SYSTEM	MANNING	3,573	Active
SOUTHWEST REG WATER DISTRICT (RED OAK)	CLARINDA	3,500	Active
NEW HAMPTON WATER SUPPLY	NEW HAMPTON	3,494	Active
XENIA RWD (WOODWARD)	BOUTON	3,465	Active
MILFORD MUNICIPAL UTILITIES	MILFORD	3,431	Active
RURAL WATER SYSTEM #1	HOSPERS	3,428	Active
STORY CITY WATER DEPT	STORY CITY	3,357	Active
WILLIAMSBURG PUBLIC WATER SUPPLY	WILLIAMSBURG	3,345	Active
CHEROKEE RWS - CHEROKEE SUBSYSTEM	CHEROKEE	3,315	Active
TIPTON WATER SUPPLY	TIPTON	3,149	Active
ROBINS, CITY OF	ROBINS	3,142	Inactive
TAMA WATER SUPPLY	TAMA	3,130	Active
MADRID WATER DEPARTMENT	PERRY	3,090	Active
GARNER WATER WORKS	GARNER	3,065	Active
SOLON WATER DEPT	SOLON	3,018	Active
SOUTHWEST REG WATER DISTRICT (CLARINDA)	CLARINDA	2,942	Active
WILTON WATER SUPPLY	WILTON	2,924	Active
ONAWA MUNICIPAL WATER PLANT	ONAWA	2,906	Active
LAKE PANORAMA WATER COMPANY	PANORA	2,900	Active
LE CLAIRE UTILITIES DEPT	LECLAIRE	2,868	Inactive
SIBLEY PUBLIC WATER SUPPLY	SIBLEY	2,860	Active
FAIRFAX WATER SUPPLY	FAIRFAX	2,828	Active
CLARION WATER SUPPLY	CLARION	2,810	Active
GRUNDY CENTER WATER SUPPLY	GRUNDY CENTER	2,796	Active
BLOOMFIELD MUNI WATER DEPT	BLOOMFIELD	2,792	Active
CENTRAL IA WATER ASSN (MARSHALLTOWN)	NEWTON	2,700	Inactive
HAWARDEN WATER SUPPLY	HAWARDEN	2,700	Active
MISSOURI VALLEY WATER SUPPLY	MISSOURI VALLEY	2,678	Active
ELDORA WATER SUPPLY	ELDORA	2,664	Active
KALONA WATER DEPT	KALONA	2,630	Active
ROCK RAPIDS MUNICIPAL WATER WORKS	ROCK RAPIDS	2,611	Active
SIRWA - CORNING	CRESTON	2,585	Active
CENTER POINT WATER SUPPLY	CENTER POINT	2,579	Active
HUDSON WATER SUPPLY	HUDSON	2,546	Active
WEST UNION WATER SUPPLY	WEST UNION	2,540	Active
MITCHELLVILLE WATER SUPPLY	MITCHELLVILLE	2,515	Active
POSTVILLE WATER DEPARTMENT	POSTVILLE	2,513	Active
WEST BRANCH WATER WORKS	WEST BRANCH	2,509	Active
JESUP MUNICIPAL WATER SUPPLY	JESUP	2,508	Active
POWESHIEK WATER ASSOCIATION (IAC)	TAMA	2,490	Active
BELMOND WATER SUPPLY	BELMOND	2,463	Active
MARENGO WATER SUPPLY	MARENGO	2,435	Active
W CENTRAL RWA - DENISON SUBSYS	MANNING	2,428	Active
OGDEN MUNICIPAL UTILITIES	OGDEN	2,419	Active
TOLEDO WATER SUPPLY	TOLEDO	2,399	Active
PARK VIEW WATER & SANITARY DISTRICT	ELDRIDGE	2,389	Active
CASCADE MUNICIPAL WATER SUPPLY	CASCADE	2,386	Active
HULL WATER SUPPLY	HULL	2,384	Active
BELLE PLAINE WATER DEPT	BELLE PLAINE	2,380	Active
BELLEVUE MUNICIPAL UTILITIES	BELLEVUE	2,363	Active
ELY WATER SUPPLY	ELY	2,328	Active
COLFAX WATER SUPPLY	COLFAX	2,305	Active
LA PORTE CITY UTILITIES	LAPORTE CITY	2,284	Active
PEOSTA WATER SUPPLY	PEOSTA	2,278	Active
ROCKWELL CITY WATER SUPPLY	ROCKWELL CITY	2,250	Active
LISBON WATER SUPPLY	LISBON	2,233	Active
ROCK VALLEY RURAL WATER DISTRICT	ROCK VALLEY	2,230	Active
GREENFIELD MUNICIPAL UTILITIES	GREENFIELD	2,227	Active
LAKE MILLS MUNICIPAL WATER DEPT-SOUTH	LAKE MILLS	2,158	Active
OSCEOLA RURAL WATER SYSTEM-SOUTH	MAY CITY	2,112	Active
WAPELLO MUNICIPAL WATER WORKS	WAPELLO	2,096	Active
SAC CITY MUNICIPAL WATER PLANT	SAC CITY	2,093	Active
ALTA MUNICIPAL WATER PLANT	ALTA	2,087	Active
NORTHWOOD WATERWORKS	NORTHWOOD	2,072	Active
WEST DUBUQUE INDUSTRIAL PARK WATER	DUBUQUE	2,065	Inactive

Showing the 200 largest of 1,768 systems on record, by population served. Browse by county above for the full list — every system has its own page, and all of them are in the sitemap.