Illinois utilities 301 to 400.

Each serves 4,178 to 6,613 people, as it reports to EPA. Your ZIP code finds yours faster.

Find a Illinois utility, city or county

301 to 400 of 491, by people served

Illinois utilities, 301 to 400 of 491, by people served
Utility	Based in	Serves	Regulated PFAS	Health-based violations since 2016
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
Eastern Illinois University	Charleston	5,500	None found	0
Watseka	Watseka	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

Utilities EPA sampled under UCMR 5, plus any other community system serving 3,300 people or more. Smaller systems appear in ZIP code results. People served is what each utility reports to EPA. Data: EPA SDWIS 2026 Q2 and UCMR 5.