Cook County, Illinois Water Systems

Cook County, Illinois

263 community water systems on record — 163 active, 100 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.

Community water systems in Cook County, Illinois

System name	Mailing city	Population served	Status
CHICAGO	CHICAGO	2,721,308	Active
CICERO	CICERO	83,000	Active
SCHAUMBURG	SCHAUMBURG	75,750	Active
EVANSTON	EVANSTON	74,486	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
HOFFMAN ESTATES	HOFFMAN ESTATES	50,179	Active
GLENVIEW	GLENVIEW	47,856	Active
BUFFALO GROVE	BUFFALO GROVE	43,212	Active
BARTLETT	BARTLETT	41,500	Active
MOUNT PROSPECT	MOUNT PROSPECT	41,000	Active
PARK RIDGE	PARK RIDGE	39,800	Active
WHEELING	WHEELING	39,725	Active
STREAMWOOD	STREAMWOOD	39,577	Active
HANOVER PARK	HANOVER PARK	37,470	Active
CALUMET CITY	CALUMET CITY	37,000	Active
NORTHBROOK	NORTHBROOK	34,407	Active
ELK GROVE VILLAGE	ELK GROVE VILLAGE	31,802	Active
AQUA ILLINOIS-NORTH MAINE UTILITIES	GLENVIEW	30,043	Active
SOUTH STICKNY SD	BURBANK	30,000	Active
NILES	NILES	29,350	Active
LANSING	LANSING	29,076	Active
OAK FOREST	OAK FOREST	27,478	Active
WILMETTE	WILMETTE	27,087	Active
CHICAGO HEIGHTS	CHICAGO HEIGHTS	26,184	Active
MORTON GROVE	MORTON GROVE	25,297	Active
ELMWOOD PARK	ELMWOOD PARK	25,000	Active
HARVEY	HARVEY	25,000	Active
MELROSE PARK	MELROSE PARK	24,206	Active
MAYWOOD	MAYWOOD	24,090	Active
ROLLING MEADOWS	ROLLING MEADOWS	23,329	Active
SOUTH HOLLAND	SOUTH HOLLAND	22,000	Active
PARK FOREST	PARK FOREST	21,687	Active
BLUE ISLAND	BLUE ISLAND	21,494	Active
DOLTON	DOLTON	20,510	Active
ST OF ILL CHI CIRCLE CAMPUS	—	20,000	Inactive
EVERGREEN PARK	EVERGREEN PARK	19,943	Active
HOMEWOOD	HOMEWOOD	19,463	Active
BELLWOOD	BELLWOOD	19,156	Active
ALSIP	ALSIP	19,063	Active
BROOKFIELD	BROOKFIELD	18,776	Active
PALOS HILLS	PALOS HILLS	18,530	Active
FRANKLIN PARK	FRANKLIN PARK	18,467	Active
JUSTICE-WILLOW SPRINGS WATER COMMISSION	JUSTICE	18,450	Active
MATTESON	MATTESON	18,293	Active
LEMONT	LEMONT	17,500	Active
COUNTRY CLUB HILLS	COUNTRY CLUB HILLS	16,500	Active
BRIDGEVIEW	BRIDGEVIEW	16,467	Active
WESTCHESTER	WESTCHESTER	16,241	Active
LA GRANGE	LA GRANGE	16,200	Active
PALOS HEIGHTS	PALOS HEIGHTS	15,500	Active
NORRIDGE	NORRIDGE	15,251	Active
MIDLOTHIAN	MIDLOTHIAN	14,819	Active
HICKORY HILLS	HICKORY HILLS	14,505	Active
FOREST PARK	FOREST PARK	14,340	Active
CHICAGO RIDGE	CHICAGO RIDGE	14,130	Active
HAZEL CREST	HAZEL CREST	13,792	Active
LINCOLNWOOD	LINCOLONWOOD	13,463	Active
WESTERN SPRINGS	WESTERN SPRINGS	13,274	Active
LA GRANGE PARK	LAGRANGE PARK	13,011	Active
NORTHLAKE	NORTH LAKE	12,840	Active
RICHTON PARK	RICHTON PARK	12,504	Active
MARKHAM	MARKHAM	12,500	Active
WINNETKA	WINNETKA	12,475	Active
COOK CO FERNDALE HGTS SUBD	PALATINE	11,724	Inactive
RIVER FOREST	RIVER FOREST	11,717	Active
SCHILLER PARK	SCHILLER PARK	11,709	Active
IL AMERICAN-CHICAGO SUBURBAN	GODFREY	11,187	Active
SUMMIT	SUMMIT	11,161	Active
WORTH	WORTH	10,970	Active
CRESTWOOD	CRESTWOOD	10,826	Active
LYONS	LYONS	10,304	Active
RIVER GROVE	RIVER GROVE	10,282	Active
RIVERDALE	RIVERDALE	10,266	Active
LEYDEN TWSP WATER DISTRICT	FRANKLIN PARK	10,000	Active
ST OF ILL NORTHEASTERN IL UNIV	—	10,000	Inactive
SAUK	SAUK VILLAGE	9,921	Active
STEGER	MANTENO	9,700	Active
FLOSSMOOR	FLOSSMOOR	9,371	Active
RIVERSIDE	RIVERSIDE	9,298	Active
LYNWOOD	LYNWOOD	9,149	Active
HARWOOD HEIGHTS	HARDWOOD HEIGHTS	9,065	Active
GLENWOOD	GLENWOOD	8,956	Active
GLENCOE	GLENCOE	8,849	Active
LOYOLA UNIV MED CNTR	PROVISO TWP	8,800	Inactive
CALUMET PARK	CALUMET PARK	8,442	Active
HILLSIDE	HILLSIDE	8,200	Active
BROADVIEW	BROADVIEW	7,847	Active
NORTH RIVERSIDE	NORTH RIVERSIDE	7,071	Active
STICKNEY	STICKNEY	6,902	Active
ST OF ILL CHI STATE UNIV	—	6,800	Inactive
LA GRANGE HIGHLANDS SANITARY DISTRICT	LAGRANGE	6,600	Active
COUNTRYSIDE	COUNTRYSIDE	6,420	Active
IL AMERICAN-FERNWAY	GODFREY	5,521	Active
NORTHFIELD	NORTHFIELD	5,470	Active
ROBBINS	ROBBINS	5,415	Active
POSEN	POSEN	5,331	Active
BERKELEY	BERKELEY	5,214	Active
ST OF ILL UOFI MED CENTER CAMP	—	5,000	Inactive
OLYMPIA FIELDS	OLYMPIA FIELDS	4,922	Active
PALOS PARK	PALOS PARK	4,873	Active
STONE PARK	WEST CHICAGO	4,576	Active
HOMETOWN	HOMETOWN	4,240	Active
BURNHAM	BURNHAM	3,989	Active
ROSEMONT	ROSEMONT	3,952	Active
SOUTH CHICAGO HEIGHTS	SOUTH CHICAGO HEIGHTS	3,924	Active
INDIAN HEAD PARK	INDIAN HEAD PARK	3,240	Active
OASIS MHP	NORTHBROOK	3,000	Active
DIXMOOR	DIXMOOR	2,973	Active
MISSION BROOK SD	NORTHBROOK	2,852	Active
SOUTH PALOS TWSP SANITARY DIST	PALOS PARK	2,800	Active
KENILWORTH	KENILWORTH	2,514	Active
CENTRAL STICKNEY SD	BURBANK	2,400	Active
THORNTON	THORNTON	2,386	Active
AQUA ILLINOIS-TIMBER RIDGE	GLENVIEW	2,322	Active
PROSPECT HEIGHTS	PROSPECT HEIGHTS	2,280	Active
ROSEBUD MHP	BRIDGEVIEW	2,250	Inactive
BRIDGEVIEW SOUTHFIELD SBDV	BRIDGEVIEW	2,200	Inactive
PHOENIX	PHOENIX	1,994	Active
MERRIONETTE PARK	MERRIONETTE PARK	1,969	Active
STERLING ESTATES MHP	FARMINGTON HILLS	1,954	Active
IL AMERICAN-WAYCINDEN	GODFREY	1,934	Active
FORD HEIGHTS	FORD HEIGHTS	1,813	Active
CHICAGO READ MHC	NORWOOD PARK TWP	1,700	Inactive
EAST HAZEL CREST	EAST HAZEL CREST	1,500	Active
GLENVIEW NAVAL AIR STATION	NORTHFIELD TWP	1,500	Inactive
O'HARE AIR RSRV FORCES FCLTY	MAINE TWP	1,500	Inactive
OAK FOREST HEALTH CENTER	CHICAGO	1,500	Inactive
UNION PACIFIC RAILROAD	DOLTON	1,500	Inactive
GARDEN HOME SD	GARDEN HOMES	1,472	Active
HODGKINS	HODGKINS	1,472	Active
SUNSET MHP	NORTHBROOK	1,400	Active
BLACKHAWK ESTATES LLC	CHICAGO	1,238	Active
BOURBON SQUARE APTS	PALATINE TWP	1,224	Inactive
SOUTH BARRINGTON	GENEVA	1,175	Active
HARBOR POINT ESTATES MHP	NORTHBROOK	1,064	Active
ST OF ILL CHI MH MED CTR COMPL	—	1,000	Inactive
ST OF ILL MADDEN MH CENTER	—	1,000	Inactive
STATE OF ILLINOIS E LUDEMAN DE	STATE OF ILLINOIS E LUDEMAN DE	1,000	Inactive
ALPINE VILLAGE MHP	PHOENIX	994	Active
SPRING LAKES MHP	ELGIN	940	Active
WILLOWAY TERRACE MHP	CHICAGO	900	Active
GLENBROOK SD	TECHNY	822	Active
FOREST VIEW	FOREST VIEW	800	Active
INVERNESS THE SHIRES	INVERNESS THE SHIRES	800	Inactive
IL AMERICAN-ALPINE HEIGHTS	GODFREY	707	Active
BUCKHORN RANCH ESTATES MHP	DENVER	702	Active
LAKE RUN APTS	NORTHFIELD TWP	700	Inactive
RIVER OAKS ESTATES MHP	BLOOMFIELD HILLS	677	Active
BEDFORD PARK	BEDFORD PARK	602	Active
PLUM CREEK CONDOS	WHEELING	570	Inactive
FRANCISCAN SISTERS OF CHICAGO	LEMONT	505	Active
GOLF	GOLF	497	Active
PARADISE MHP	PHOENIX	460	Active
IL AMERICAN-MORELAND	GODFREY	445	Active
LA GRANGE ESTATES MHP	LAGRANGE	440	Active
CANDLELIGHT VILLAGE MHP	FARMINGTON HILLS	420	Active
DES PLAINES MHP	DESPLAINES	405	Active
OAK LANE MHC	DENVER	388	Active
BROOKFIELD ZOOLOGICAL PARK	BROOKFIELD	385	Inactive
LINWAY ESTATES MHP	BLUE ISLAND	380	Active
UTL INC-COUNTY LINE WATER COMPANY	MCHENRY	366	Inactive
PALOS PARK THE COMMONS	PALOS PARK THE COMMONS	350	Inactive
GLEN EDEN ESTATES HOMEOWNERS ASSOCIATION	NORWOOD PARK TOWNSHIP	312	Active
NILES NURSING AND REHABILITATION	NILES	304	Inactive
TINLEY PARK MHC	TINLEY PARK	300	Inactive
MC COOK	MCCOOK	280	Active
LITTLE CITY FOUNDATION	PALATINE TWP	250	Inactive
PLUM GROVE CONDOS	LIBERTYVILLE	250	Inactive
LINDENTREE TOWNHOMES	GLENVIEW	232	Active
WEATHERSTONE LAKES MHP	PHOENIX	221	Active
GOLF GREENWOOD IMPROVEMENT ASSOCIATION	DES PLAINES	219	Inactive
BARRINGTON WOODS MWA	PALATINE TWP	210	Inactive
HOLY FAMILY VILLA	LEMONT	200	Inactive
COOK CO NO SHORE TOWERS CONDO	—	180	Inactive
COOK COUNTY EDGEWOOD AC	COOK COUNTY	175	Inactive
AFFORDABLE LIVING CONCEPTS	WHEELING TWP	173	Inactive
PALOS PARK (WTR ASSN)	PALOS PARK (WTR ASSN)	160	Inactive
CONCORD TERRACE WTR CMPNY INC	SCHAUMBURG TWP	150	Inactive
NORTH GLENVIEW MHP	GLENVIEW	150	Inactive
AQUA ILLINOIS-SUMMERDALE	GLENVIEW	145	Active
ORLAND HILL SBDV	ORLAND TWP	140	Inactive
MOORINGS HLTH CTR	WHEELING TWP	135	Inactive
IL AMERICAN-MIDWEST PALOS	GODFREY	126	Active
DIVINE WORD SEMINARY	NORTHFIELD TWP	105	Inactive
SANTA FE MNP	LYONS TWP	88	Inactive
SUNRISE SENIOR LIVING	PROSPECT HEIGHTS	82	Active
OLYMPIA FIELDS COUNTRY CLUB	OLYMPIA FIELDS	61	Inactive
EDWARD HINES JR V A HOSPITAL	HINES	60	Active
HERRICK HS	HANOVER TWP	57	Inactive
COOK CO COUNTRYSIDE PLAZA	—	50	Inactive
PALOS PARK BROOKSIDE S	PALOS PARK BROOKSIDE S	40	Inactive
COLEMAN TRI-CO SERVICES	COLEMAN TRI-CO SERVICES	25	Inactive

Showing the 200 largest of 263 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.