U.S. water systems

Illinois Water Systems

Illinois

2,874 community water systems on record — 1,787 active, 1,087 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 Illinois’s official records. Always confirm current status with Illinois before making decisions based on this information.

Counties in Illinois

Adams County (28)Alexander County (6)Bond County (12)Boone County (15)Brown County (5)Bureau County (31)Calhoun County (5)Carroll County (12)Cass County (9)Champaign County (57)Christian County (17)Clark County (7)Clay County (7)Clinton County (24)Coles County (16)Cook County (263)Crawford County (11)Cumberland County (4)De Witt County (11)DeKalb County (22)Douglas County (15)DuPage County (89)Edgar County (8)Edwards County (4)Effingham County (19)Fayette County (12)Ford County (11)Franklin County (23)Fulton County (23)Gallatin County (8)Greene County (12)Grundy County (26)Hamilton County (5)Hancock County (12)Hardin County (7)Henderson County (8)Henry County (70)Iroquois County (33)Jackson County (25)Jasper County (4)Jefferson County (14)Jersey County (9)Jo Daviess County (20)Johnson County (7)Kane County (58)Kankakee County (42)Kendall County (11)Knox County (22)Lake County (142)LaSalle County (53)Lawrence County (8)Lee County (21)Livingston County (22)Logan County (19)Macon County (18)Macoupin County (40)Madison County (54)Marion County (17)Marshall County (12)Mason County (13)Massac County (4)McDonough County (19)McHenry County (47)McLean County (49)Menard County (8)Mercer County (19)Monroe County (10)Montgomery County (21)Morgan County (18)Moultrie County (7)Ogle County (32)Peoria County (44)Perry County (15)Piatt County (10)Pike County (13)Pope County (4)Pulaski County (6)Putnam County (10)Randolph County (18)Richland County (11)Rock Island County (125)Saline County (12)Sangamon County (52)Schuyler County (6)Scott County (6)Shelby County (12)St. Clair County (42)Stark County (5)Stephenson County (264)Tazewell County (57)Union County (10)Vermilion County (38)Wabash County (6)Warren County (6)Washington County (12)Wayne County (11)White County (9)Whiteside County (14)Will County (100)Williamson County (29)Winnebago County (78)Woodford County (25)

All community water systems in Illinois

System name	Mailing city	Population served	Status
CHICAGO	CHICAGO	2,721,308	Active
AURORA	AURORA	183,000	Active
JOLIET	—	160,000	Active
NAPERVILLE	NAPERVILLE	156,406	Active
IL AMERICAN-CHAMPAIGN	GODFREY	150,000	Active
ROCKFORD	ROCKFORD	147,051	Active
IL AMERICAN-PEORIA	GODFREY	137,575	Active
IL AMERICAN-EAST ST LOUIS	GODFREY	131,368	Active
SPRINGFIELD	SPRINGFIELD	117,444	Active
ELGIN	ELGIN	114,797	Active
WAUKEGAN	WAUKEGAN	87,149	Active
CICERO	CICERO	83,000	Active
AQUA ILLINOIS-KANKAKEE	GLENVIEW	80,000	Active
BLOOMINGTON	BLOOMINGTON	77,610	Active
DECATUR	DECATUR	76,122	Active
SCHAUMBURG	SCHAUMBURG	75,750	Active
EVANSTON	EVANSTON	74,486	Active
IL AMERICAN-WEST SUBURBAN	GODFREY	73,978	Active
ARLINGTON HEIGHTS	ARLINGTON HEIGHTS	73,320	Active
PALATINE	PALATINE	70,875	Active
SKOKIE	SKOKIE	66,422	Active
DES PLAINES	DES PLAINES	60,675	Active
OAK LAWN	OAK LAWN	58,362	Active
ORLAND PARK	ORLAND PARK	58,020	Active
BERWYN	BERWYN	57,250	Active
TINLEY PARK	TINLEY PARK	56,703	Active
OAK PARK	OAK PARK	54,583	Active
WHEATON	WHEATON	53,970	Active
NORMAL	NORMAL	52,736	Active
ROMEOVILLE	ROMEOVILLE	50,458	Active
HOFFMAN ESTATES	HOFFMAN ESTATES	50,179	Active
PLAINFIELD	PLAINFIELD	50,000	Active
DOWNERS GROVE	DOWNERS GROVE	49,425	Active
GLENVIEW	GLENVIEW	47,856	Active
O FALLON	O'FALLON	46,603	Active
IL AMERICAN-ALTON	GODFREY	46,127	Active
ELMHURST	ELMHURST	45,000	Active
MOLINE	MOLINE	44,500	Active
LOMBARD	LOMBARD	44,476	Active
BUFFALO GROVE	BUFFALO GROVE	43,212	Active
QUINCY	QUINCY	42,000	Active
BARTLETT	BARTLETT	41,500	Active
MOUNT PROSPECT	MOUNT PROSPECT	41,000	Active
CRYSTAL LAKE	CRYSTAL LAKE	40,661	Active
DEKALB	DEKALB	40,290	Active
CAROL STREAM	CAROL STREAM	39,854	Active
PARK RIDGE	PARK RIDGE	39,800	Active
WHEELING	WHEELING	39,725	Active
STREAMWOOD	STREAMWOOD	39,577	Active
ROCK ISLAND	ROCK ISLAND	39,018	Active
OSWEGO	OSWEGO	38,169	Active
ADDISON	ADDISON	38,017	Active
CARPENTERSVILLE	CARPENTERSVILLE	37,983	Active
HANOVER PARK	HANOVER PARK	37,470	Active
CALUMET CITY	CALUMET CITY	37,000	Active
NORTH PARK PWD	MACHESNEY PARK	35,580	Active
NORTHBROOK	NORTHBROOK	34,407	Active
IL AMERICAN-GRANITE CITY	GODFREY	33,572	Active
WOODRIDGE	WOODRIDGE	33,566	Active
VERNON HILLS - LAKE CO PW	—	33,207	Active
GLENDALE HEIGHTS	GLENDALE HEIGHTS	33,176	Active
ST CHARLES	ST. CHARLES	33,103	Active
ELK GROVE VILLAGE	ELK GROVE VILLAGE	31,802	Active
IL AMERICAN-PEKIN	GODFREY	31,731	Active
GALESBURG	GALESBURG	31,620	Active
MUNDELEIN	MUNDELEIN	31,500	Active
ALGONQUIN	ALGONQUIN	30,700	Active
GURNEE	GURNEE	30,193	Active
HIGHLAND PARK	HIGHLAND PARK	30,176	Active
AQUA ILLINOIS-VERMILION COUNTY	GLENVIEW	30,106	Active
AQUA ILLINOIS-NORTH MAINE UTILITIES	GLENVIEW	30,043	Active
SOUTH STICKNY SD	BURBANK	30,000	Active
EJ WATER COOPERATIVE	DIETERICH	29,720	Active
COLLINSVILLE	COLLINSVILLE	29,500	Active
NILES	NILES	29,350	Active
LANSING	LANSING	29,076	Active
MONTGOMERY	MONTGOMERY	28,956	Active
GLEN ELLYN	GLEN ELLYN	28,850	Active
LAKE IN THE HILLS	LAKE IN THE HILLS	28,661	Active
HUNTLEY	HUNTLEY	28,495	Active
NEW LENOX	NEW LENOX	27,690	Active
OAK FOREST	OAK FOREST	27,478	Active
ROUND LAKE BEACH	ROUND LAKE BEACH	27,200	Active
WILMETTE	WILMETTE	27,087	Active
EDWARDSVILLE	EDWARDSVILLE	26,808	Active
CHICAGO HEIGHTS	CHICAGO HEIGHTS	26,184	Active
BATAVIA	BATAVIA	26,098	Active
WOODSTOCK	WOODSTOCK	25,630	Active
BELVIDERE	BELVIDERE	25,339	Active
MORTON GROVE	MORTON GROVE	25,297	Active
WEST CHICAGO	WEST CHICAGO	25,166	Active
ELMWOOD PARK	ELMWOOD PARK	25,000	Active
HARVEY	HARVEY	25,000	Active
IL AMERICAN-HOMER TOWNSHIP	GODFREY	24,543	Active
ZION	ZION	24,442	Active
LISLE	LISLE	24,223	Active
MELROSE PARK	MELROSE PARK	24,206	Active
WESTMONT	WESTMONT	24,161	Active
MAYWOOD	MAYWOOD	24,090	Active
FRANKFORT	FRANKFORT	24,000	Active
FREEPORT	FREEPORT	23,930	Active
SOUTH ELGIN	SOUTH ELGIN	23,648	Active
LOVES PARK	LOVES PARK	23,335	Active
ROLLING MEADOWS	ROLLING MEADOWS	23,329	Active
LOCKPORT	LOCKPORT	23,100	Active
GREAT LAKES NAVAL TRAINING STATION	GREAT LAKES	23,000	Active
YORKVILLE	YORKVILLE	23,000	Active
ROSELLE	ROSELLE	22,897	Active
MCHENRY	MCHENRY	22,335	Active
EAST PEORIA	EAST PEORIA	22,284	Active
VILLA PARK	VILLA PARK	22,263	Active
CARBONDALE	CARBONDALE	22,107	Active
BLOOMINGDALE	BLOOMINGDALE	22,018	Active
SOUTH HOLLAND	SOUTH HOLLAND	22,000	Active
DARIEN	DARIEN	21,751	Active
PARK FOREST	PARK FOREST	21,687	Active
BLUE ISLAND	BLUE ISLAND	21,494	Active
EAST MOLINE	EAST MOLINE	21,374	Active
GRAYSLAKE	GRAYSLAKE	21,248	Active
GENEVA	GENEVA	21,247	Active
CREST HILL	CREST HILL	21,169	Active
DOLTON	DOLTON	20,510	Active
LIBERTYVILLE	LIBERTYVILLE	20,500	Active
ST OF ILL CHI CIRCLE CAMPUS	—	20,000	Inactive
EVERGREEN PARK	EVERGREEN PARK	19,943	Active
JACKSONVILLE	JACKSONVILLE	19,903	Active
MOKENA	MOKENA	19,887	Active
LAKE ZURICH	LAKE ZURICH	19,759	Active
LAKE FOREST	LAKE FOREST	19,642	Active
MATTOON	MATTOON	19,500	Active
HOMEWOOD	HOMEWOOD	19,463	Active
DEERFIELD	DEERFIELD	19,196	Active
BELLWOOD	BELLWOOD	19,156	Active
ALSIP	ALSIP	19,063	Active
IL AMERICAN-STREATOR	GODFREY	19,000	Active
BROOKFIELD	BROOKFIELD	18,776	Active
SHOREWOOD	SHOREWOOD	18,645	Active
BENSENVILLE	BENSENVILLE	18,537	Active
PALOS HILLS	PALOS HILLS	18,530	Active
SYCAMORE	SYCAMORE	18,500	Active
FRANKLIN PARK	FRANKLIN PARK	18,467	Active
JUSTICE-WILLOW SPRINGS WATER COMMISSION	JUSTICE	18,450	Active
ROUND LAKE	ROUND LAKE	18,430	Active
MATTESON	MATTESON	18,293	Active
NORTH AURORA	NORTH AURORA	18,261	Active
OTTAWA	OTTAWA	18,097	Active
HINSDALE	HINSDALE	17,900	Active
CARY	—	17,826	Active
LEMONT	LEMONT	17,500	Active
CHARLESTON	CHARLESTON	17,286	Active
MORTON	MORTON	17,111	Active
TROY	TROY	16,962	Active
MARION	MARION	16,855	Active
NORTH CHICAGO	NORTH CHICAGO	16,813	Active
CANTON	CANTON	16,748	Active
COUNTRY CLUB HILLS	COUNTRY CLUB HILLS	16,500	Active
BRIDGEVIEW	BRIDGEVIEW	16,467	Active
CHATHAM	CHATHAM	16,423	Active
WESTCHESTER	WESTCHESTER	16,241	Active
LA GRANGE	LA GRANGE	16,200	Active
MOUNT VERNON	MOUNT VERNON	15,793	Active
PALOS HEIGHTS	PALOS HEIGHTS	15,500	Active
BOLINGBROOK	WOODRIDGE	15,404	Inactive
WAUCONDA	WAUCONDA	15,349	Active
NORRIDGE	NORRIDGE	15,251	Active
BETHALTO	BETHALTO	15,210	Active
IL AMERICAN-LINCOLN	GODFREY	15,200	Active
DIXON	DIXON	15,096	Active
MACOMB	MACOMB	15,051	Active
WILDWOOD SUBDIVISION - LAKE CO PW	—	14,832	Active
MIDLOTHIAN	MIDLOTHIAN	14,819	Active
WASHINGTON	WASHINGTON	14,793	Active
IL AMERICAN-STERLING	GODFREY	14,782	Active
MORRIS	MORRIS	14,775	Active
HICKORY HILLS	HICKORY HILLS	14,505	Active
LINDENHURST	LINDENHURST	14,500	Active
FOREST PARK	FOREST PARK	14,340	Active
ANTIOCH	ANTIOCH	14,175	Active
CHICAGO RIDGE	CHICAGO RIDGE	14,130	Active
WOOD DALE	WOOD DALE	14,012	Active
CASEYVILLE	CASEYVILLE	13,798	Active
HAZEL CREST	HAZEL CREST	13,792	Active
LINCOLNWOOD	LINCOLONWOOD	13,463	Active
CHANNAHON	CHANNAHON	13,380	Active
WESTERN SPRINGS	WESTERN SPRINGS	13,274	Active
LA GRANGE PARK	LAGRANGE PARK	13,011	Active
RANTOUL	RANTOUL	13,000	Active
U OF I-CHAMPAIGN	CHAMPAIGN	13,000	Active
NORTHLAKE	NORTH LAKE	12,840	Active
TAYLORVILLE	TAYLORVILLE	12,806	Active
MINOOKA	MINOOKA	12,800	Active
JERSEY RWC	JERSEYVILLE	12,750	Active
HERRIN	HERRIN	12,747	Active
GLEN CARBON	GLEN CARBON	12,618	Active
PLANO	PLANO	12,600	Active
CAHOKIA HEIGHTS	CAHOKIA HEIGHTS	12,528	Active
KEWANEE	KEWANEE	12,509	Active
RICHTON PARK	RICHTON PARK	12,504	Active
MARKHAM	MARKHAM	12,500	Active
WINNETKA	WINNETKA	12,475	Active

Showing the 200 largest of 2,874 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.