Iowa tap water, by utility.

156 utilities with a full report, serving 2.5 million people as they report it. Regulated PFAS turned up at 17 of them.

Iowa utilities by population served
Utility	Based in	Serves	Regulated PFAS	Health-based violations since 2016
Des Moines Water Works	Des Moines	246,055	None found	1
Iowa - American WTR Co - Davenport	Davenport	147,720	PFOA	0
Cedar Rapids Water Department	Cedar Rapids	142,364	None found	0
Sioux City Water Supply	Sioux City	85,791	PFOA, PFOS, PFHxS, PFBS	5
City of Ankeny	Ankeny	76,207	None found	0
West Des Moines Water Works	West Des Moines	73,959	None found	0
Waterloo Water Works	Waterloo	69,504	PFHxS, PFBS	0
Iowa City Water Department	Iowa City	68,753	None found	0
Council Bluffs Water Works	Council Bluffs	64,447	None found	0
Dubuque Water Works	Dubuque	59,667	PFOA	0
Ames Water Treatment Plant	Ames	55,177	None found	0
Urbandale Water Utility	Urbandale	45,605	None found	0
Isu	Ames	42,000	None found	0
Marion Municipal Water Dept	Marion	41,623	None found	0
Cedar Falls Municipal Water Utilities	Cedar Falls	40,713	None found	0
IA Regional Utilities Assoc (Waverly)	Waverly	37,820	None found	0
Rathbun Regional Water Assn (Rathbun)	Centerville	33,000	None found	0
Waukee Water Supply	Waukee	31,823	None found	0
Marshalltown Water Works	Marshalltown	27,680	None found	0
Mason City Water Department	Mason City	27,338	None found	0
University Water System	Iowa City	26,684	None found	2
Burlington Municipal Waterworks	Burlington	26,015	PFBS	1
Fort Dodge Water Supply	Fort Dodge	25,874	None found	0
Ottumwa Water Works	Ottumwa	25,529	None found	0
Muscatine Power & Water	Muscatine	25,516	PFOA, PFOS, PFBS	0
Johnston Municipal Water Supply	Johnston	24,897	None found	0
Iowa - American WTR Co - Clinton District	Clinton	24,769	PFBS	0
North Liberty Water Supply	North Liberty	23,276	None found	0
Coralville Muni Water System	Coralville	22,318	None found	0
Sirwa #2 (Creston)	Creston	20,793	None found	0
Clive Water Department	Clive	20,277	None found	0
Warren Water District	Indianola	20,095	None found	0
Altoona Water Supply	Altoona	19,565	None found	1
Grimes Water Supply	Grimes	17,809	None found	0
Wapello Rural Water Assoc.	Ottumwa	17,263	None found	0
Newton Water Supply	Newton	16,518	None found	0
Indianola Water Supply	Indianola	15,833	None found	0
Norwalk Water Supply	Norwalk	14,334	None found	0
Poweshiek Water Association	Brooklyn	13,920	None found	0
Xenia RWD (Des Moines)	Minburn	12,860	None found	0
Oskaloosa Municipal Water Dept	Oskaloosa	12,808	None found	0
Boone Water Works	Boone	12,704	None found	4
Rathbun Reg Water Assn (Ft Madison)	Fort Madison	11,840	None found	0
Storm Lake Water Treatment Plant	Storm Lake	11,431	None found	0
Spencer Municipal Water Utility	Spencer	11,325	None found	0
Ft Madison Muni Water Works	Fort Madison	11,087	None found	0
Pella Water Works Department	Pella	11,052	None found	0
Lemars Water Department	Le Mars	10,606	None found	0
Waverly Water Department	Waverly	10,394	PFOA, PFHxS, PFBS	0
Carroll Municipal Water Supply	Carroll	10,184	None found	0
Keokuk Municipal Water Works	Keokuk	9,900	PFBS	0
Fairfield Water Supply	Fairfield	9,821	None found	0
Mahaska Rural Water System, Inc.	Oskaloosa	9,818	None found	1
Grinnell Water Department	Grinnell	9,564	None found	13
Bondurant Muni Water Supply	Bondurant	9,393	PFHxS	0
Denison Water Supply	Denison	9,381	None found	0
Mount Pleasant Municipal Utilities	Mount Pleasant	9,274	None found	0
Iowa Lakes Regional Water - Osgood	Graettinger	9,021	None found	0
Knoxville Water Works	Knoxville	8,400	None found	0
Rathbun Reg WTR Assn (Burlington)	Burlington	8,375	None found	0
Sioux Center Municipal Water Department	Sioux Center	8,231	None found	0
Perry Municipal Water Works	Perry	7,836	None found	0
Webster City Water Supply	Webster City	7,825	None found	0
Clear Lake Water Department	Clear Lake	7,687	None found	0
Decorah Water Department	Decorah	7,615	PFBS	0
Tiffin Water Supply	Tiffin	7,577	Not sampled	0
Southeast Polk RWD	Altoona	7,565	None found	0
Creston Water Supply	Creston	7,536	None found	2
Charles City Water Supply	Charles City	7,446	None found	0
Washington Water Department	Washington	7,362	None found	0
Atlantic Municipal Utilities	Atlantic	7,252	None found	0
Hiawatha Water Dept	Hiawatha	7,183	PFHxS, PFBS	0
Osceola Rural Water System - North	May City	7,002	None found	0
Nevada Water Supply	Nevada	6,925	None found	0
Iowa Lakes Regional Water	Spencer	6,755	None found	0
Eldridge Water Supply	Eldridge	6,726	None found	0
Polk City Water Supply	Polk City	6,533	None found	0
Adel Municipal Water Works	Adel	6,461	None found	0
Orange City Municipal Water Department	Orange City	6,267	None found	0
Spirit Lake Waterworks	Spirit Lake	6,167	None found	1
Maquoketa Municipal Water	Maquoketa	6,128	None found	0
Xenia RWD (North)	Stratford	6,122	None found	0
Independence Water Dept	Independence	6,064	None found	0
Asbury Municipal Water System	Asbury	5,943	None found	0
Oelwein Municipal Water Works	Oelwein	5,920	None found	0
Estherville Water Treatment Plant	Estherville	5,904	None found	0
Marion Co. Rural Water District	Knoxville	5,687	None found	0
Red Oak Water Supply	Red Oak	5,596	None found	0
De Witt Water Supply	De Witt	5,514	None found	0
Sheldon Water Department	Sheldon	5,512	None found	0
Osceola Water Works	Osceola	5,503	None found	6
Algona Municipal Utilities	Algona	5,487	None found	0
Glenwood Municipal Utilities	Glenwood	5,449	None found	0
Winterset Municipal Waterworks	Winterset	5,428	None found	1
Southern Sioux County Rural Water	Ireton	5,420	None found	0
Centerville Municipal Waterworks	Centerville	5,344	None found	0
Cherokee Water Supply - Plant 1	Cherokee	5,199	None found	0
Iowa Falls Water Department	Iowa Falls	5,146	None found	0
Manchester Water Supply	Manchester	5,077	None found	0
Harlan Municipal Utilities	Harlan	5,067	None found	0
Sergeant Bluff Water Supply	Sergeant Bluff	5,015	None found	0
Xenia RWD (Boone)	Luther	4,975	None found	0
Vinton Municipal Water Dept	Vinton	4,938	None found	0
Shenandoah Water Dept	Shenandoah	4,925	None found	0
Humboldt Municipal Water Dept	Humboldt	4,792	None found	0
Sac & Fox (Meskwaki) in Iowa	Tama	4,765	None found	0
Camanche Water Supply	Camanche	4,570	None found	0
Evansdale Water Works	Evansdale	4,561	None found	0
Mount Vernon Water Supply	Mount Vernon	4,527	None found	0
Dyersville Municipal Water Co	Dyersville	4,477	None found	3
Anamosa Municipal Water Supply	Anamosa	4,457	None found	0
Chariton Municipal Water Works	Chariton	4,381	None found	20
Clarinda Water Plant	Clarinda	4,372	None found	0
Hampton Muni Water Works	Hampton	4,337	None found	0
Forest City Water Supply	Forest City	4,285	None found	0
Huxley Waterworks Dept	Huxley	4,244	None found	0
Jefferson Water Department	Jefferson	4,182	None found	0
Carlisle Water Supply	Carlisle	4,170	PFHxS	0
Regional Water	Avoca	4,132	None found	1
Sirwa #3 (Osceola)	Osceola	4,080	None found	0
Rock Valley Water Supply	Rock Valley	4,059	None found	0
Monticello Water Supply	Monticello	4,040	None found	0
West Liberty Water Utility	West Liberty	3,938	None found	0
Cresco Waterworks	Cresco	3,913	None found	0
Waukon Water Department	Waukon	3,827	None found	0
Carter Lake Water District	Carter Lake	3,791	None found	0
Emmetsburg Municipal Water Department	Emmetsburg	3,733	None found	0
West Burlington Muni. Water Supply	West Burlington	3,728	PFOA, PFBS	0
Albia Municipal Water Works	Albia	3,721	None found	0
Osage Municipal Water Supply	Osage	3,637	PFOS, PFHxS	0
Eagle Grove Water Supply	Eagle Grove	3,601	None found	0
West Central RWA - Nish System	Manning	3,573	None found	0
Southwest Reg Water District (Red Oak)	Red Oak	3,500	Not sampled	0
New Hampton Water Supply	New Hampton	3,494	None found	0
Xenia RWD (Woodward)	Woodward	3,465	None found	0
Milford Municipal Utilities	Milford	3,431	Not sampled	1
Rural Water System #1	Hospers	3,428	None found	1
Story City Water Dept	Story City	3,357	None found	0
Williamsburg Public Water Supply	Williamsburg	3,345	Not sampled	0
Cherokee RWS - Cherokee Subsystem	Cherokee	3,315	Not sampled	0
Onawa Municipal Water Plant	Onawa	2,906	None found	0
Belle Plaine Water Dept	Belle Plaine	2,380	None found	0
West Central RWA - Boyer System	Wall Lake	1,715	None found	0
Urban Bluffs - North	Council Bluffs	1,558	PFBS	0
Lyon - Sioux RWS - Big Sioux	Rock Rapids	1,530	None found	0
Clarksville Water Supply	Clarksville	1,254	None found	0
Melcher - Dallas Water Supply	Melcher - Dallas	1,213	None found	0
Anita Municipal Utilities	Anita	972	None found	0
Cambridge Water Supply	Cambridge	832	PFBS	0
Okoboji Water Supply	Okoboji	776	None found	0
Bancroft Water Supply	Bancroft	711	None found	0
Clermont Water Supply	Clermont	586	None found	0
Iowa City MHP LLC	Iowa City	280	None found	0
Portsmouth Water Supply	Portsmouth	189	None found	0
Garden Grove Water Supply	Garden Grove	179	None found	0
Riverview Subdivision	Montpelier	37	None found	0
Utilities EPA sampled under UCMR 5, plus any other community system serving 3,300 people or more. Smaller systems appear in ZIP code results. Data: EPA SDWIS 2026 Q2 and UCMR 5.