Illinois tap water, by utility.

491 utilities with a full report, serving 11 million people as they report it. Regulated PFAS turned up at 59 of them.

Illinois utilities by population served
Utility	Based in	Serves	Regulated PFAS	Health-based violations since 2016
Chicago	Chicago	2,721,308	None found	0
Aurora	Aurora	183,000	PFBS	0
Joliet	Joliet	160,000	None found	1
Naperville	Naperville	156,406	None found	0
IL American - Champaign	Champaign	150,000	None found	0
Rockford	Rockford	147,051	PFHxS	0
IL American - Peoria	Peoria	137,575	PFOS, PFBS	0
IL American - East St Louis	East St Louis	131,368	None found	0
Springfield	Springfield	117,444	None found	0
Elgin	Elgin	114,797	None found	0
Waukegan	Waukegan	87,149	None found	0
Cicero	Cicero	83,000	None found	1
Aqua Illinois - Kankakee	Kankakee	80,000	None found	1
Bloomington	Bloomington	77,610	None found	0
Decatur	Decatur	76,122	None found	0
Schaumburg	Schaumburg	75,750	None found	0
Evanston	Evanston	74,486	None found	0
IL American - West Suburban	Bolingbrook	73,978	None found	0
Arlington Heights	Arlington Heights	73,320	None found	0
Palatine	Palatine	70,875	None found	0
Skokie	Skokie	66,422	None found	0
Des Plaines	Des Plaines	60,675	None found	0
Oak Lawn	Oak Lawn	58,362	None found	0
Orland Park	Orland Park	58,020	None found	0
Berwyn	Berwyn	57,250	None found	0
Tinley Park	Tinley Park	56,703	None found	0
Oak Park	Oak Park	54,583	None found	0
Wheaton	Wheaton	53,970	None found	0
Normal	Normal	52,736	None found	0
Romeoville	Romeoville	50,458	None found	0
Hoffman Estates	Hoffman Estates	50,179	None found	0
Plainfield	Plainfield	50,000	None found	0
Downers Grove	Downers Grove	49,425	None found	0
Glenview	Glenview	47,856	None found	0
O Fallon	O Fallon	46,603	None found	0
IL American - Alton	Alton	46,127	None found	0
Elmhurst	Elmhurst	45,000	None found	0
Moline	Moline	44,500	None found	0
Lombard	Lombard	44,476	None found	0
Buffalo Grove	Buffalo Grove	43,212	None found	0
Quincy	Quincy	42,000	PFBS	0
Bartlett	Bartlett	41,500	None found	0
Mount Prospect	Mount Prospect	41,000	None found	0
Crystal Lake	Crystal Lake	40,661	PFBS	0
Dekalb	De Kalb	40,290	None found	0
Carol Stream	Carol Stream	39,854	None found	0
Park Ridge	Park Ridge	39,800	None found	0
Wheeling	Wheeling	39,725	None found	1
Streamwood	Streamwood	39,577	None found	0
Rock Island	Rock Island	39,018	None found	0
Oswego	Oswego	38,169	None found	1
Addison	Addison	38,017	None found	0
Carpentersville	Carpentersville	37,983	None found	0
Hanover Park	Hanover Park	37,470	None found	0
Calumet City	Calumet City	37,000	None found	2
North Park PWD	Machesney Park	35,580	PFOA, PFOS, PFHxS, PFBS	0
Northbrook	Northbrook	34,407	None found	0
IL American - Granite City	Granite City	33,572	None found	0
Woodridge	Woodridge	33,566	None found	0
Vernon Hills - Lake Co Pw	Vernon Hills	33,207	None found	0
Glendale Heights	Glendale Heights	33,176	None found	0
St Charles	Saint Charles	33,103	PFBS	0
Elk Grove Village	Elk Grove	31,802	None found	0
IL American - Pekin	Pekin	31,731	PFOS, PFHxS, PFNA, PFBS	0
Galesburg	Galesburg	31,620	PFOA, PFOS, PFBS	0
Mundelein	Mundelein	31,500	None found	0
Algonquin	Algonquin	30,700	None found	0
Gurnee	Gurnee	30,193	None found	0
Highland Park	Highland Park	30,176	None found	0
Aqua Illinois - Vermilion County	Danville	30,106	None found	0
Aqua Illinois - North Maine Utilities	Glenview	30,043	None found	0
South Stickny SD	Burbank (South Stickney)	30,000	None found	0
Ej Water Cooperative	Dieterich	29,720	None found	0
Collinsville	Collinsville	29,500	PFOA, PFOS, PFHxS, PFBS	0
Niles	Niles	29,350	None found	0
Lansing	Lansing	29,076	None found	0
Montgomery	Montgomery	28,956	None found	0
Glen Ellyn	Glen Ellyn	28,850	None found	0
Lake in the Hills	Lake in the Hills	28,661	None found	0
Huntley	Huntley	28,495	None found	1
New Lenox	New Lenox	27,690	None found	0
Oak Forest	Oak Forest	27,478	None found	0
Round Lake Beach	Round Lake Beach	27,200	None found	0
Wilmette	Wilmette	27,087	None found	0
Edwardsville	Edwardsville	26,808	PFBS	0
Chicago Heights	Chicago Heights	26,184	None found	0
Batavia	Batavia	26,098	None found	0
Woodstock	Woodstock	25,630	None found	1
Belvidere	Belvidere	25,339	PFHxS	0
Morton Grove	Morton Grove	25,297	None found	0
West Chicago	West Chicago	25,166	None found	0
Harvey	Harvey	25,000	None found	0
Elmwood Park	Elmwood Park	25,000	None found	0
IL American - Homer Township	Godfrey	24,543	None found	0
Zion	Zion	24,442	None found	0
Lisle	Lisle	24,223	None found	0
Melrose Park	Melrose Park	24,206	None found	0
Westmont	Westmont	24,161	None found	0
Maywood	Maywood	24,090	None found	1
Frankfort	Frankfort	24,000	None found	0
Freeport	Freeport	23,930	PFOS	0
South Elgin	South Elgin	23,648	PFOA, PFBS	1
Loves Park	Loves Park	23,335	None found	0
Rolling Meadows	Rolling Meadows	23,329	None found	0
Lockport	Lockport	23,100	PFHxS, PFBS	0
Great Lakes Naval Training Station	North Chicago	23,000	None found	0
Yorkville	Yorkville	23,000	None found	0
Roselle	Roselle	22,897	None found	0
McHenry	McHenry	22,335	PFBS	0
East Peoria	East Peoria	22,284	PFOS, PFHxS, PFBS	0
Villa Park	Villa Park	22,263	None found	0
Carbondale	Carbondale	22,107	None found	4
Bloomingdale	Weston	22,018	None found	0
South Holland	South Holland	22,000	None found	2
Darien	Darien	21,751	None found	0
Park Forest	Park Forest	21,687	None found	1
Blue Island	Blue Island	21,494	None found	0
East Moline	East Moline	21,374	PFBS	0
Grayslake	Grays Lake	21,248	None found	0
Geneva	Geneva	21,247	None found	0
Crest Hill	Crest Hill	21,169	PFOA, PFHxS, PFBS	1
Dolton	Dolton	20,510	None found	0
Libertyville	Libertyville	20,500	None found	0
Evergreen Park	Evergreen Park	19,943	None found	0
Jacksonville	Jacksonville	19,903	None found	0
Mokena	Mokena	19,887	None found	0
Lake Zurich	Lake Zurich	19,759	None found	0
Lake Forest	Lake Forest	19,642	None found	0
Mattoon	Mattoon	19,500	None found	0
Homewood	Homewood	19,463	PFOA	0
Deerfield	Deerfield	19,196	None found	0
Bellwood	Bellwood	19,156	None found	1
Alsip	Alsip	19,063	None found	0
IL American - Streator	Streator	19,000	PFBS	0
Brookfield	Brookfield	18,776	None found	0
Shorewood	Shorewood	18,645	None found	0
Bensenville	Bensenville	18,537	None found	0
Palos Hills	Palos Hills	18,530	None found	0
Sycamore	Sycamore	18,500	None found	0
Franklin Park	Franklin Park	18,467	None found	0
Justice - Willow Springs Water Commission	Justice	18,450	None found	0
Round Lake	Round Lake	18,430	None found	0
Matteson	Matteson	18,293	None found	0
North Aurora	North Aurora	18,261	None found	0
Ottawa	Ottawa	18,097	None found	1
Hinsdale	Hinsdale	17,900	None found	0
Cary	Cary	17,826	None found	0
Lemont	Lemont	17,500	None found	1
Charleston	Charleston	17,286	None found	1
Morton	Morton	17,111	None found	0
Troy	Troy	16,962	PFBS	0
Marion	Marion	16,855	None found	0
North Chicago	North Chicago	16,813	None found	2
Canton	Canton	16,748	None found	0
Country Club Hills	Country Club Hills	16,500	None found	0
Bridgeview	Bridgeview	16,467	None found	0
Chatham	Chatham	16,423	None found	0
Westchester	Westchester	16,241	None found	0
La Grange	La Grange	16,200	None found	0
Mount Vernon	Mount Vernon	15,793	None found	0
Palos Heights	Palos Heights	15,500	None found	0
Wauconda	Wauconda	15,349	None found	0
Norridge	Norridge	15,251	None found	0
Bethalto	Bethalto	15,210	PFHxS, PFBS	0
IL American - Lincoln	Lincoln	15,200	PFOA	1
Dixon	Dixon	15,096	None found	0
Macomb	Macomb	15,051	None found	4
Wildwood Subdivision - Lake Co Pw		14,832	None found	0
Midlothian	Midlothian	14,819	None found	0
Washington	Washington	14,793	None found	0
IL American - Sterling	Coleta	14,782	None found	0
Morris	Morris	14,775	None found	0
Hickory Hills	Hickory Hills	14,505	None found	0
Lindenhurst	Lindenhurst	14,500	None found	0
Forest Park	Forest Park	14,340	None found	0
Antioch	Antioch	14,175	None found	0
Chicago Ridge	Chicago Ridge	14,130	None found	0
Wood Dale	Wood Dale	14,012	None found	0
Caseyville	Caseyville	13,798	None found	0
Hazel Crest	Hazel Crest	13,792	None found	0
Lincolnwood	Lincolnwood	13,463	None found	0
Channahon	Channahon	13,380	PFOA, PFOS, PFBS	0
Western Springs	Western Springs	13,274	None found	1
La Grange Park	La Grange Park	13,011	None found	0
Rantoul	Rantoul	13,000	None found	0
U of I - Champaign	Urbana	13,000	None found	0
Northlake	North Lake	12,840	None found	0
Taylorville	Taylorville	12,806	None found	0
Minooka	Minooka	12,800	PFBS	1
Jersey Rwc	Jerseyville	12,750	None found	0
Herrin	Herrin	12,747	None found	0
Glen Carbon	Glen Carbon	12,618	None found	0
Plano	Plano	12,600	None found	0
Cahokia Heights	Cahokia	12,528	None found	0
Kewanee	Kewanee	12,509	None found	0
Richton Park	Richton Park	12,504	None found	2
Markham	Markham	12,500	None found	0
Winnetka	Winnetka	12,475	None found	0
Warrenville	Warrenville	12,350	None found	0
Effingham	Effingham	12,252	None found	0
Centralia	Centralia	12,182	None found	0
IL American - Pontiac	Pontiac	11,864	None found	0
Fox Lake	Fox Lake	11,780	PFOS	0
River Forest	River Forest	11,717	None found	0
Schiller Park	Schiller Park	11,709	None found	0
Washington County Water Company	Nashville	11,374	None found	1
Lake of Egypt PWD	Marion	11,368	None found	2
Robinson - Palestine Water Commission	Robinson	11,331	PFOS, PFHxS	0
Sugar Grove	Sugar Grove	11,243	PFHxS	0
Burr Ridge	Burr Ridge	11,192	None found	0
IL American - Chicago Suburban	Godfrey	11,187	None found	0
Summit	Summit	11,161	None found	0
Columbia	Columbia	11,129	PFBS	0
Worth	Worth	10,970	None found	0
Crestwood	Crestwood	10,826	None found	0
Highland	Highland	10,674	None found	0
Wood River	Wood River	10,464	PFOS	0
Pingree Grove	Hampshire	10,365	None found	1
Manhattan	Manhattan	10,340	None found	0
Barrington	Barrington	10,327	None found	0
Lyons	Lyons	10,304	None found	0
Peru	Peru	10,300	None found	1
River Grove	River Grove	10,282	None found	0
Riverdale	Riverdale	10,266	None found	0
Murphysboro	Murphysboro	10,241	None found	1
Waterloo	Waterloo	10,190	None found	0
Maryville	Maryville	10,150	None found	0
Leyden Twsp Water District	Franklin Park	10,000	None found	0
Sauk	Sauk	9,921	None found	0
Winfield	Winfield	9,835	None found	0
La Salle	La Salle	9,700	PFBS	6
Steger	Steger	9,700	None found	1
Clark - Edgar RWD	Marshall	9,657	None found	0
Itasca	Itasca	9,506	None found	0
Harvard	Harvard	9,469	None found	0
Rochelle	Rochelle	9,446	None found	8
Oak Brook	Oak Brook	9,400	None found	0
Flossmoor	Flossmoor	9,371	None found	0
Riverside	Riverside	9,298	None found	0
Lynwood	Lynwood	9,149	None found	0
Paris	Paris	9,100	None found	0
Harwood Heights	Harwood Heights	9,065	None found	0
Willowbrook	Willowbrook	9,000	None found	0
Glenwood	Glenwood	8,956	None found	0
Monmouth	Monmouth	8,902	None found	1
Clear Water Service Corp		8,900	None found	0
Olney	Olney	8,877	None found	0
Glencoe	Forest Park	8,849	None found	0
Lake Villa	Lake Villa	8,829	None found	0
Mascoutah	Mascoutah	8,759	None found	0
Beach Park	Beach Park	8,710	None found	0
Clarendon Hills	Clarendon Hills	8,702	None found	0
West Frankfort	West Frankfort	8,650	None found	0
Rock Falls	Rock Falls	8,620	None found	0
Harrisburg	Harrisburg	8,524	None found	1
Calumet Park	Calumet Park	8,442	None found	0
IL American - Jerseyville	Jerseyville	8,412	None found	0
Chester	Chester	8,407	PFBS	0
Gilberts	Gilberts	8,366	None found	0
Greenville	Greenville	8,310	None found	0
Prairie Path Water Co - Whispering Hills		8,300	PFOA, PFHxS, PFBS	1
Crete	Crete	8,275	None found	0
Hillside	Hillside	8,200	None found	0
Benton	Benton	8,104	None found	1
Island Lake	Island Lake	8,066	None found	0
Mill Creek Water Reclamation District	Geneva	8,000	None found	0
Western Illinois University	Macomb	8,000	None found	0
Fosterburg PWD	Alton	7,940	None found	0
Lincolnshire	Lincolnshire	7,940	None found	0
Salem	Salem	7,905	None found	0
IL American - South Beloit	South Beloit	7,893	PFBS	0
Long Creek Township PWS	Long Creek	7,850	None found	0
Broadview	Broadview	7,847	None found	0
West Dundee	West Dundee	7,845	None found	0
Princeton	Princeton	7,832	None found	2
Rock Island Arsenal, US Army	Rock Island	7,800	PFOA	0
Hampshire	Hampshire	7,758	None found	2
Rockton	Rockton	7,685	PFHxS	1
North Tazewell PWD	East Peoria	7,625	None found	13
Vandalia	Vandalia	7,616	None found	1
Marengo	Marengo	7,572	PFBS	0
Silvis	Silvis	7,473	None found	1
Clinton	Clinton	7,200	None found	0
Duquoin	Du Quoin	7,169	None found	1
Sandwich	Sandwich	7,156	None found	0
Mendota	Mendota	7,100	None found	3
Raccoon Water Company	Centralia	7,080	None found	0
North Riverside	North Riverside	7,071	None found	0
Mount Carmel	Mount Carmel	7,015	PFOS, PFBS	1
Aqua Illinois - University Park	Pk Forest South	7,002	PFBS	1
Southeast Regional Water Facility	Darien	6,940	None found	0
Stickney	Stickney	6,902	None found	0
Abs Water Coop	Clayton	6,858	None found	0
American Water Oper and Maintenance, LLC	Scott Air Force Base	6,779	None found	0
IL American - Valley View	Godfrey	6,721	PFOA	0
Chillicothe	Chillicothe	6,660	None found	0
Curran - Gardner Township PWD	Springfield	6,651	None found	0
Litchfield	Litchfield	6,648	None found	3
Bond/Madison Water Company	Pocahontas	6,645	None found	0
Volo	Volo	6,629	None found	1
IL American - Dupage Utility	Godfrey	6,613	Not sampled	0
Illinois State University - Normal	Normal	6,600	None found	0
La Grange Highlands Sanitary District	Lagrange	6,600	None found	0
Carlinville	Carlinville	6,598	None found	0
Mahomet	Mahomet	6,580	None found	0
Winthrop Harbor	Winthrop Harbor	6,565	None found	0
Elburn	Elburn	6,559	PFOA	0
Geneseo	Geneseo	6,539	None found	0
Carterville	Carterville	6,528	None found	0
Northern Illinois University - Dekalb	Dekalb	6,500	None found	0
Aqua Illinois - Candlewick Dvn	Glenview	6,426	None found	0
Countryside	Countryside	6,420	None found	0
Dallas Rural Water District	Dallas City	6,370	None found	0
Metropolis	Metropolis	6,309	None found	0
Carmi	Carmi	6,307	None found	0
Fort Massac PWD	Joppa	6,290	None found	1
Fairfield	Fairfield	6,202	None found	1
Williamsville	Williamsville	6,198	None found	0
Braidwood	Braidwood	6,194	None found	0
Beardstown	Beardstown	5,951	None found	0
Peoria Heights	Peoria Heights	5,908	PFHxS, PFBS	0
Mount Zion	Mount Zion	5,833	None found	8
Pinckneyville	Pinckneyville	5,804	None found	10
Hoopeston	Hoopeston	5,802	None found	0
Pana	Pana	5,800	None found	0
East Alton	East Alton	5,786	PFOA, PFOS, PFHxS, PFBS	0
Staunton	Staunton	5,756	None found	1
Mill Creek PWD	Quincy	5,755	None found	0
Grandwood Park Subdivision - Lake Co Pw		5,751	None found	0
Coal City	Coal City	5,749	None found	7
Wilmington	Wilmington	5,700	PFBS	0
Fayette Water Company	Brownstown	5,608	None found	7
Lake Bluff	Lake Bluff	5,600	None found	0
Shelbyville	Shelbyville	5,600	None found	0
Spring Valley	Spring Valley	5,582	None found	0
Millstone PWD	Nashville	5,565	None found	5
Monticello	Monticello	5,548	None found	0
IL American - Fernway	Westhaven	5,521	None found	0
Watseka	Watseka	5,500	None found	0
Eastern Illinois University	Charleston	5,500	None found	0
Northeast Mount Vernon Water Company	MT Vernon	5,483	None found	0
Northfield	Northfield	5,470	None found	0
Park City	Park City	5,425	None found	0
Robbins	Robbins	5,415	None found	0
Pike County PWD 1	Pittsfield	5,375	None found	0
Aqua Illinois - Oak Brook	Oak Brook	5,361	Not sampled	0
Highwood	Highwood	5,335	None found	0
Posen	Posen	5,331	None found	0
Sangamon Valley PWD	Mahomet	5,300	None found	0
Genoa	Genoa	5,298	None found	0
Mitchell PWD	Granite City	5,253	PFBS	0
Flora	Flora	5,233	None found	0
Eureka	Eureka	5,216	None found	0
Berkeley	Berkeley	5,214	None found	0
Monee	Monee	5,148	None found	0
Caterpillar Trail PWD	Eureka	5,125	None found	0
Aqua Illinois - Willowbrook	Manhattan	5,100	None found	0
Marseilles	Marseilles	5,061	None found	1
Brighton	Brighton	5,041	None found	0
South Highway PWD	Makanda	4,972	None found	4
Murdale PWD	Murphysboro	4,963	None found	0
Milan	Milan	4,945	None found	0
Creve Coeur	Creve Coeur	4,934	None found	0
Olympia Fields	Olympia Fields	4,922	None found	0
Anna	Anna	4,910	None found	4
Round Lake Park	Round Lake Park	4,900	None found	1
Tuscola	Tuscola	4,875	None found	0
Palos Park	Palos Park	4,873	None found	0
West Prairie Water Company	Arthur	4,800	Not sampled	0
Breese	Breese	4,772	None found	0
Prairie Path Water Company - Lake Holiday	St. Charles	4,750	None found	0
Cherry Valley	Cherry Valley	4,731	None found	2
Sullivan	Sullivan	4,729	None found	0
Petersburg	Petersburg	4,725	None found	0
Eldorado	Eldorado	4,715	None found	1
Lebanon	Lebanon	4,714	None found	0
Beecher	Beecher	4,713	None found	0
Freeburg	Freeburg	4,707	PFOS	0
Fox River Grove	Fox River Grove	4,702	PFHxS	1
Pittsfield	Pittsfield	4,697	None found	0
Dupo	Dupo	4,684	PFOS, PFHxS, PFBS	0
Calhoun County RWD	Hardin	4,675	None found	1
Stone Park	Stone Park	4,576	None found	0
Athens	Athens	4,575	None found	0
Auburn	Auburn	4,574	None found	0
Lawrenceville	Lawrenceville	4,524	None found	2
Oglesby	Oglesby	4,500	None found	0
Hillsboro	Hillsboro	4,402	None found	3
Dwight	Dwight	4,400	None found	1
Cortland	Cortland	4,398	None found	0
Sparta	Sparta	4,395	None found	8
Smithton	Smithton	4,381	Not sampled	0
Riverton	Riverton	4,279	None found	0
Lakewood	Lakewood	4,267	Not sampled	0
Hometown	Hometown	4,240	None found	0
Georgetown	Georgetown	4,200	None found	0
Paxton	Paxton	4,200	None found	0
Morrison	Morrison	4,188	None found	0
Aqua Illinois - Peotone	Peotone	4,182	None found	0
New Baden	New Baden	4,178	PFOS	0
Woodhaven	Sublette	4,100	None found	1
Millstadt	Millstadt	4,071	PFBS	0
Coal Valley PWD	Marion	4,023	None found	0
Wasco SD	Wasco	4,000	None found	0
Burnham	Burnham	3,989	None found	0
North East Central PWD	Edwardsville	3,975	PFOA, PFOS	0
Hamilton County Water District	McLeansboro	3,958	None found	0
Rosemont	Rosemont	3,952	None found	0
Marshall	Marshall	3,947	None found	0
Corinth PWD	Pittsburg	3,927	None found	0
South Chicago Heights	South Chicago Heights	3,924	None found	0
Saline Valley Conservancy District	Eldorado	3,921	None found	3
Westville	Westville	3,917	None found	0
Metamora	Metamora	3,895	None found	0
Coal Valley	Coal Valley	3,873	None found	1
Wonder Lake	Wonder Lake	3,870	None found	1
Rochester	Rochester	3,856	None found	0
Red Bud	Red Bud	3,804	None found	3
Greene County RWD	Carrollton	3,786	Not sampled	0
Byron	Byron	3,784	None found	0
Pleasant Valley PWD	Peoria	3,783	PFHxS, PFBS	1
Embarras Area Water District	Charleston	3,750	None found	0
Gillespie	Gillespie	3,737	None found	2
Lcpw - Pekara Subdivision		3,711	None found	0
Fountain Water District	Valmeyer	3,650	None found	1
Rend Lake Inter - City Water System	Benton	3,650	Not sampled	0
Fairbury	Fairbury	3,633	None found	1
Riverwoods	Riverwoods	3,618	None found	0
IL American - Tolono	Tolono	3,604	Not sampled	4
Woodlawn	Woodlawn	3,587	None found	0
Three County PWD	New Douglas	3,575	Not sampled	5
Hainesville	Hainesville	3,528	None found	0
Western Wayne Water District	Wayne City	3,516	Not sampled	0
Johnston City	Johnston City	3,509	None found	1
South Jacksonville	South Jacksonville	3,501	None found	1
Gibson City	Gibson City	3,500	None found	0
Le Roy	Le Roy	3,498	None found	4
Forsyth	Forsyth	3,490	None found	1
Tritownship Water District	Highland	3,470	None found	0
Aledo	Aledo	3,470	None found	0
Oregon	Oregon	3,449	None found	1
Hardinville Water Company	Robinson	3,403	Not sampled	0
Mackinaw	Mackinaw	3,399	None found	0
Rushville	Rushville	3,375	Not sampled	0
Carlyle	Carlyle	3,373	None found	0
Lake Sara Area Water Co - Op, Inc.	Effingham	3,352	None found	0
Fulton	Fulton	3,346	None found	1
Pontoon Beach PWD	Pontoon Beach	3,325	None found	0
Galena	Galena	3,308	None found	1
IL American - Liberty Ridge West	Godfrey	3,307	None found	0
Abingdon	Abingdon	3,275	PFOA, PFOS, PFBS	2
Virden	Virden	3,274	None found	0
Casey	Casey	3,274	None found	2
Nashville	Nashville	3,230	None found	0
North East Marion County Water Cmpny	Salem	3,220	None found	0
Dixmoor	Dixmoor	2,973	PFOA, PFOS	0
Bushnell	Bushnell	2,972	None found	0
Havana	Havana	2,963	None found	0
Holiday Shores SD	Edwardsville	2,840	PFOA	3
Southern IL University - Edwardsville	Edwardsville	2,817	PFBS	0
Kenilworth	Kenilworth	2,514	None found	0
Carrollton	Carrollton	2,513	None found	0
Prairie Path Water Company - Galena	Galena	2,294	None found	1
Mount Olive	Aviston	2,193	None found	3
Crystal Lawns Addition Improvement Assoc	Joliet	1,435	PFBS	0
Valmeyer	Valmeyer	1,263	None found	0
IL American - Andalusia	Andalusia	1,184	None found	0
IL American - Country Club	Godfrey	1,014	None found	0
Mendon	Mendon	953	None found	0
Kinmundy	Kinmundy	940	None found	0
Willow Lake Estates MHP	Elgin	920	None found	1
Shady Oaks MHP	Chicago	912	None found	0
Hanover	Hanover	863	None found	0
Wee - Ma - Tuk Water District	Cuba	863	None found	0
Poplar Grove West - Countryside	Poplar Grove	790	None found	0
Bluffs	Bluffs	748	None found	0
Ashkum	Ashkum	724	None found	1
Moro PWD	Moro	723	PFHxS, PFBS	1
Vandalia Correctional Center	Vandalia	700	None found	0
Prairie Path Water Company - Clarendon	St. Charles	625	None found	1
Blandinsville	Blandinsville	569	None found	0
West Liberty - Dundas Water District	Dundas	563	None found	1
Xenia	Xenia	542	None found	0
Buckley	Buckley	500	None found	0
Altona	Altona	483	None found	0
Buda	Buda	482	None found	4
Alexander Water District	Alexander	442	None found	4
Bookwalter Woods MHP	Gardner	389	None found	0
Lake Windermere Estates Subdivision	Tremont	300	None found	0
Dover	Dover	200	None found	1
Low Point Water District	Lowpoint	200	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.