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State utility hub
Browse the indexed community water systems in this state. Each profile brings the provider’s payment routes and household protection policies into a single, practical guide.
Municipal Department
Service area: City of Chicago, Cook County
Population: 2,721,308 people (EPA SDWIS PWS ID IL0316000; active community water system record)
Municipal Department
Service area: Aurora
Population: 183,000 people (EPA SDWIS active CWS PWS IL0894070)
Municipal Department
Service area: Joliet and participating municipal service areas
Population: 160,000 people (EPA SDWIS active CWS PWS IL1970450)
Municipal Department
Service area: Naperville, Illinois and unincorporated Naperville service areas
Population: 156,406 people (EPA SDWIS active CWS PWS IL0434670)
Private Investor-Owned Utility
Service area: Champaign and Illinois American Water service areas
Population: 150,000 people (EPA SDWIS active CWS PWS IL0195300)
Municipal Department
Service area: Rockford, Illinois
Population: 147,051 people (EPA SDWIS active CWS PWS IL2010300)
Private Investor-Owned Utility
Service area: Peoria and Illinois American Water service areas
Population: 137,575 people (EPA SDWIS active CWS PWS IL1435030)
Private Investor-Owned Utility
Service area: East St. Louis
Population: 131,368
Private Investor-Owned Utility
Service area: East St. Louis and Illinois American Water Interurban Metro East service area
Population: 131,368
Private Investor-Owned Utility
Service area: East St. Louis and Illinois American Water East St. Louis system
Population: 131,368
Municipal Department
Service area: Springfield, Illinois
Population: 117,444
Municipal Department
Service area: Elgin
Population: 114,797
Municipal Department
Service area: Cicero, Cook County, Illinois
Population: 83,000 people
Private Investor-Owned Utility
Service area: Kankakee and the Aqua Illinois Kankakee water system
Population: 80,000 people
Municipal Department
Service area: City of Bloomington and connected Bloomington-Normal service area
Population: 77,610 people (EPA SDWA system estimate)
Municipal Department
Service area: Decatur
Population: 76,122 people (EPA SDWA system estimate)
Municipal Department
Service area: Schaumburg
Population: 75,750 people (EPA SDWA system estimate)
Municipal Department
Service area: Evanston
Population: 74,486 people served according to the EPA queue; Evanston's Meter Division reports approximately 14,500 metered retail water and sewer accounts.
Private Investor-Owned Utility
Service area: Chicago West Suburban service area
Population: Approximately 73,978 people for EPA CWS IL1974151, the West Suburban service-area record.
Municipal Department
Service area: Arlington Heights
Population: Approximately 73,320 people in the EPA-listed Arlington Heights community-water-system service area.
Municipal Department
Service area: Village of Palatine and applicable outlying service areas, including portions outside the Village and not within Deer Park
Population: 70,875 people (EPA SDWIS queue estimate for IL0312340)
Municipal Department
Service area: Village of Skokie
Population: 66,422 people (EPA SDWA queue estimate for IL0312880)
Municipal Department
Service area: City of Des Plaines
Population: 60,675 people (EPA SDWA queue estimate for IL0310630)
Municipal Department
Service area: Village of Oak Lawn
Population: 58,362 people (EPA SDWA queue estimate for IL0312220)
Municipal Department
Service area: Village of Orland Park
Population: 58,020 people (EPA SDWA queue estimate for IL0312310)
Municipal Department
Service area: City of Berwyn
Population: 57,250 people (EPA SDWA queue estimate for IL0310210)
Municipal Department
Service area: Village of Tinley Park
Population: 56,703 people (EPA SDWA queue estimate for IL0314910)
Municipal Department
Service area: Village of Oak Park
Population: 54,583 people (EPA SDWA queue estimate for IL0312250)
Municipal Department
Service area: City of Wheaton
Population: 53,970 people (EPA SDWA queue estimate for IL0431050)
Municipal Department
Service area: Town of Normal
Population: 52,736 people (EPA SDWA queue estimate for IL1130900)
Municipal Department
Service area: Village of Romeoville
Population: 50,458 people (EPA SDWA queue estimate for IL1970900)
Municipal Department
Service area: Village of Hoffman Estates
Population: 50,179 people (EPA SDWA queue estimate for IL0311290)
Municipal Department
Service area: Village of Plainfield
Population: 50,000 people (EPA SDWA queue estimate for IL1970800)
Public Water Authority
Service area: Machesney Park, Roscoe, and North Park Public Water District service area
Population: 35,580 people (EPA SDWIS service-population record for IL2015500)
Municipal Department
Service area: Northbrook
Population: 34,407 people (EPA SDWA queue estimate for IL0312070)
Private Investor-Owned Utility
Service area: Granite City
Population: 33,572 people (EPA SDWA queue estimate for IL1195030)
Municipal Department
Service area: Woodridge
Population: 33,566 people (EPA SDWA queue estimate for IL0431250)
Public Water Authority
Service area: Vernon Hills and Lake County Public Works service area
Population: 33,207 people (EPA SDWA queue estimate for IL0971750)
Municipal Department
Service area: Glendale Heights
Population: 33,176 people (EPA SDWA queue estimate for IL0430400)
Municipal Department
Service area: St. Charles
Population: 33,103 people (EPA SDWA queue estimate for IL0894830)
Municipal Department
Service area: Elk Grove Village
Population: 31,802 people (EPA SDWA queue estimate for IL0314400)
Private Investor-Owned Utility
Service area: Pekin
Population: 31,731 people (EPA SDWA queue estimate for IL1795040)
Municipal Department
Service area: Galesburg
Population: 31,620 people (EPA SDWA queue estimate for IL0950200)
Municipal Department
Service area: Mundelein
Population: 31,500 people (EPA SDWA queue estimate for IL0971150)
Municipal Department
Service area: Algonquin
Population: 30,700 people (EPA SDWA queue estimate for IL1110050)
Municipal Department
Service area: Gurnee
Population: 30,193 people (EPA SDWA queue estimate for IL0970350)
Municipal Department
Service area: Highland Park
Population: 30,176 people (EPA SDWA queue estimate for IL0970500)
Private Investor-Owned Utility
Service area: Vermilion County / Danville
Population: 30,106 people (EPA SDWA queue estimate for IL1835120)
Private Investor-Owned Utility
Service area: North Maine Township
Population: 30,043 people (EPA SDWA queue estimate for IL0315350)
Public Water Authority
Service area: South Stickney
Population: 30,000 people (EPA SDWA queue estimate for IL0317370)
Public Water Authority
Service area: EJ Water Cooperative service area
Population: 29,720 people (EPA SDWA queue estimate for IL0790010)
Municipal Department
Service area: Collinsville
Population: 29,500 people (EPA SDWA queue estimate for IL1194280)
Municipal Department
Service area: Niles
Population: 29,350 people (EPA SDWA queue estimate for IL0312010)
Municipal Department
Service area: Lansing
Population: 29,076 people (EPA SDWA queue estimate for IL0311590)
Municipal Department
Service area: Montgomery
Population: 28,956 people (EPA SDWA queue estimate for IL0894690)
Municipal Department
Service area: Glen Ellyn
Population: 28,850 people (EPA SDWA queue estimate for IL0430450)
Municipal Department
Service area: Lake in the Hills
Population: 28,661 people (EPA SDWA queue estimate for IL1110400)
Municipal Department
Service area: Huntley
Population: 28,495 people (EPA SDWA queue estimate for IL1110350)
Municipal Department
Service area: New Lenox
Population: 27,690 people (EPA SDWA queue estimate for IL1970700)
Municipal Department
Service area: Oak Forest
Population: 27,478 people (EPA SDWA queue estimate for IL0312190)
Municipal Department
Service area: Round Lake Beach
Population: 27,200 people (EPA SDWIS 2026Q2 estimate for IL0971550)
Municipal Department
Service area: Wilmette
Population: 27,087 people (EPA SDWIS 2026Q2 estimate for IL0313300)
Municipal Department
Service area: Edwardsville
Population: 26,808 people (EPA SDWIS 2026Q2 estimate for IL1190250)
Municipal Department
Service area: Chicago Heights
Population: 26,184 people (EPA SDWIS 2026Q2 estimate for IL0310450)
Municipal Department
Service area: Batavia
Population: 26,098 people (EPA SDWIS 2026Q2 estimate for IL0894130)
Municipal Department
Service area: Woodstock
Population: 25,630 people (EPA SDWIS 2026Q2 estimate for IL1110950)
Municipal Department
Service area: Belvidere
Population: 25,339 people (EPA SDWIS 2026Q2 estimate for IL0070050)
Municipal Department
Service area: Morton Grove
Population: 25,297 people (EPA SDWIS 2026Q2 estimate for IL0311950)
Municipal Department
Service area: West Chicago
Population: 25,166 people (EPA SDWIS 2026Q2 estimate for IL0430900)
Municipal Department
Service area: Harvey
Population: 25,000 people (EPA SDWIS 2026Q2 estimate for IL0311110)
Municipal Department
Service area: Elmwood Park
Population: 25,000 people (EPA SDWIS 2026Q2 estimate for IL0310780)
Private Investor-Owned Utility
Service area: Homer Township / Godfrey
Population: 24,543 people (EPA SDWIS 2026Q2 estimate for IL1970100)
Municipal Department
Service area: Zion
Population: 24,442 people (EPA SDWIS 2026Q2 estimate for IL0972000)
Municipal Department
Service area: Lisle
Population: 24,223 people (EPA SDWIS 2026Q2 estimate for IL0430551)
Municipal Department
Service area: Melrose Park
Population: 24,206 people (EPA SDWIS 2026Q2 estimate for IL0311860)
Municipal Department
Service area: Westmont
Population: 24,161 people (EPA SDWIS 2026Q2 estimate for IL0430950)
Municipal Department
Service area: Maywood
Population: 24,090 people (EPA SDWIS 2026Q2 estimate for IL0311830)
Municipal Department
Service area: Freeport
Population: 23,930 people (EPA SDWIS 2026Q2 estimate for IL1770200)
Municipal Department
Service area: South Elgin
Population: 23,648 people (EPA SDWIS 2026Q2 estimate for IL0890800)
Municipal Department
Service area: Loves Park
Population: 23,335 people (EPA SDWIS 2026Q2 estimate for IL2010150)
Municipal Department
Service area: Rolling Meadows
Population: 23,329 people (EPA SDWIS 2026Q2 estimate for IL0312730)
Municipal Department
Service area: Lockport
Population: 23,100 people (EPA SDWIS 2026Q2 estimate for IL1970500)
Municipal Department
Service area: Great Lakes Naval Training Station
Population: 23,000 people (EPA SDWIS 2026Q2 estimate for IL0975227)
Municipal Department
Service area: Yorkville
Population: 23,000 people (EPA SDWIS 2026Q2 estimate for IL0930250)
Municipal Department
Service area: Roselle
Population: 22,897 people (EPA SDWIS 2026Q2 estimate for IL0434820)
Municipal Department
Service area: McHenry
Population: 22,335 people (EPA SDWIS 2026Q2 estimate for IL1110600)
Municipal Department
Service area: East Peoria
Population: 22,284 people (EPA SDWIS 2026Q2 estimate for IL1790200)
Municipal Department
Service area: Villa Park
Population: 22,263 people (EPA SDWIS 2026Q2 estimate for IL0430800)
Municipal Department
Service area: Carbondale
Population: 22,107 people (EPA SDWIS 2026Q2 estimate for IL0770150)
Municipal Department
Service area: Bloomingdale
Population: 22,018 people (EPA SDWIS 2026Q2 estimate for IL0430100)
Municipal Department
Service area: South Holland
Population: 22,000 people (EPA SDWIS 2026Q2 estimate for IL0312970)
Municipal Department
Service area: Darien
Population: 21,751 people (EPA SDWIS 2026Q2 estimate for IL0430270)
Municipal Department
Service area: Park Forest
Population: 21,687 people (EPA SDWIS 2026Q2 estimate for IL0314740)
Municipal Department
Service area: Blue Island
Population: 21,494 people (EPA SDWIS 2026Q2 estimate for IL0310240)
Municipal Department
Service area: East Moline
Population: 21,374 people (EPA SDWIS 2026Q2 estimate for IL1610250)
Municipal Department
Service area: Grayslake
Population: 21,248 people (EPA SDWIS 2026Q2 estimate for IL0970250)
Municipal Department
Service area: Geneva
Population: 21,247 people (EPA SDWIS 2026Q2 estimate for IL0890350)
Municipal Department
Service area: Crest Hill
Population: 21,169 people (EPA SDWIS 2026Q2 estimate for IL1970250)
Municipal Department
Service area: Dolton
Population: 20,510 people (EPA SDWIS 2026Q2 estimate for IL0310690)
Municipal Department
Service area: Libertyville
Population: 20,500 people (EPA SDWIS 2026Q2 estimate for IL0970900)
Municipal Department
Service area: Evergreen Park
Population: 19,943 people (EPA SDWIS 2026Q2 estimate for IL0310840)
Municipal Department
Service area: Jacksonville
Population: 19,903 people (EPA SDWIS 2026Q2 estimate for IL1370200)
Municipal Department
Service area: Mokena
Population: 19,887 people (EPA SDWIS 2026Q2 estimate for IL1970600)
Municipal Department
Service area: Lake Zurich
Population: 19,759 people (EPA SDWIS 2026Q2 estimate for IL0970850)
Municipal Department
Service area: Lake Forest
Population: 19,642 people (EPA SDWIS 2026Q2 estimate for IL0970800)
Municipal Department
Service area: Mattoon
Population: 19,500 people (EPA SDWIS 2026Q2 estimate for IL0290250)
Municipal Department
Service area: Homewood
Population: 19,463 people (EPA SDWIS 2026Q2 estimate for IL0311350)
Municipal Department
Service area: Deerfield
Population: 19,196 people (EPA SDWIS 2026Q2 estimate for IL0974340)
Municipal Department
Service area: Bellwood
Population: 19,156 people (EPA SDWIS 2026Q2 estimate for IL0310150)
Municipal Department
Service area: Alsip
Population: 19,063 people (EPA SDWIS 2026Q2 estimate for IL0310030)
Private Investor-Owned Utility
Service area: Streator
Population: 19,000 people (EPA SDWIS 2026Q2 estimate for IL0995030)
Municipal Department
Service area: Brookfield
Population: 18,776 people (EPA SDWIS 2026Q2 estimate for IL0310330)
Municipal Department
Service area: Shorewood
Population: 18,645 people (EPA SDWIS 2026Q2 estimate for IL1975080)
Municipal Department
Service area: Bensenville
Population: 18,537 people (EPA SDWIS 2026Q2 estimate for IL0434140)
Municipal Department
Service area: Palos Hills
Population: 18,530 people (EPA SDWIS 2026Q2 estimate for IL0312400)
Municipal Department
Service area: Sycamore
Population: 18,500 people (EPA SDWIS 2026Q2 estimate for IL0370550)
Municipal Department
Service area: Franklin Park
Population: 18,467 people (EPA SDWIS 2026Q2 estimate for IL0310960)
Public Water Authority
Service area: Justice
Population: 18,450 people (EPA SDWIS 2026Q2 estimate for IL0315820)
Municipal Department
Service area: Round Lake
Population: 18,430 people (EPA SDWIS 2026Q2 estimate for IL0971500)
Municipal Department
Service area: Matteson
Population: 18,293 people (EPA SDWIS 2026Q2 estimate for IL0311800)
Municipal Department
Service area: North Aurora
Population: 18,261 people (EPA SDWIS 2026Q2 estimate for IL0890600)
Municipal Department
Service area: Ottawa
Population: 18,097 people (EPA SDWIS 2026Q2 estimate for IL0990800)
Municipal Department
Service area: Hinsdale
Population: 17,900 people (EPA SDWIS 2026Q2 estimate for IL0434520)
Private Investor-Owned Utility
Service area: GODFREY
Population: 131368 people (EPA SDWIS 2026Q2 active CWS estimate for IL1635040)
Municipal Department
Service area: SPRINGFIELD
Population: 117444 people (EPA SDWIS 2026Q2 active CWS estimate for IL1671200)
Municipal Department
Service area: ELGIN
Population: 114797 people (EPA SDWIS 2026Q2 active CWS estimate for IL0894380)
Municipal Department
Service area: WAUKEGAN
Population: 87149 people (EPA SDWIS 2026Q2 active CWS estimate for IL0971900)
Municipal Department
Service area: CICERO
Population: 83000 people (EPA SDWIS 2026Q2 active CWS estimate for IL0310510)
Private Investor-Owned Utility
Service area: GLENVIEW
Population: 80000 people (EPA SDWIS 2026Q2 active CWS estimate for IL0915030)
Municipal Department
Service area: BLOOMINGTON
Population: 77610 people (EPA SDWIS 2026Q2 active CWS estimate for IL1130200)
Municipal Department
Service area: DECATUR
Population: 76122 people (EPA SDWIS 2026Q2 active CWS estimate for IL1150150)
Municipal Department
Service area: SCHAUMBURG
Population: 75750 people (EPA SDWIS 2026Q2 active CWS estimate for IL0314890)
Municipal Department
Service area: EVANSTON
Population: 74486 people (EPA SDWIS 2026Q2 active CWS estimate for IL0310810)
Municipal Department
Service area: DOWNERS GROVE
Population: 49425 people (EPA SDWIS 2026Q2 active CWS estimate for IL0430300)
Municipal Department
Service area: GLENVIEW
Population: 47856 people (EPA SDWIS 2026Q2 active CWS estimate for IL0311020)
Municipal Department
Service area: O'FALLON
Population: 46603 people (EPA SDWIS 2026Q2 active CWS estimate for IL1631100)
Private Investor-Owned Utility
Service area: GODFREY
Population: 46127 people (EPA SDWIS 2026Q2 active CWS estimate for IL1195150)
Municipal Department
Service area: ELMHURST
Population: 45000 people (EPA SDWIS 2026Q2 active CWS estimate for IL0430350)
Municipal Department
Service area: MOLINE
Population: 44500 people (EPA SDWIS 2026Q2 active CWS estimate for IL1610450)
Municipal Department
Service area: LOMBARD
Population: 44476 people (EPA SDWIS 2026Q2 active CWS estimate for IL0430600)
Municipal Department
Service area: BUFFALO GROVE
Population: 43212 people (EPA SDWIS 2026Q2 active CWS estimate for IL0314180)
Municipal Department
Service area: QUINCY
Population: 42000 people (EPA SDWIS 2026Q2 active CWS estimate for IL0010650)
Municipal Department
Service area: BARTLETT
Population: 41500 people (EPA SDWIS 2026Q2 active CWS estimate for IL0314120)
Municipal Department
Service area: MOUNT PROSPECT
Population: 41000 people (EPA SDWIS 2026Q2 active CWS estimate for IL0311980)
Municipal Department
Service area: CRYSTAL LAKE
Population: 40661 people (EPA SDWIS 2026Q2 active CWS estimate for IL1110150)
Municipal Department
Service area: DEKALB
Population: 40290 people (EPA SDWIS 2026Q2 active CWS estimate for IL0370100)
Municipal Department
Service area: CAROL STREAM
Population: 39854 people (EPA SDWIS 2026Q2 active CWS estimate for IL0430200)
Municipal Department
Service area: PARK RIDGE
Population: 39800 people (EPA SDWIS 2026Q2 active CWS estimate for IL0312460)
Municipal Department
Service area: WHEELING
Population: 39725 people (EPA SDWIS 2026Q2 active CWS estimate for IL0314970)
Municipal Department
Service area: STREAMWOOD
Population: 39577 people (EPA SDWIS 2026Q2 active CWS estimate for IL0313060)
Municipal Department
Service area: ROCK ISLAND
Population: 39018 people (EPA SDWIS 2026Q2 active CWS estimate for IL1610650)
Municipal Department
Service area: OSWEGO
Population: 38169 people (EPA SDWIS 2026Q2 active CWS estimate for IL0930150)
Municipal Department
Service area: ADDISON
Population: 38017 people (EPA SDWIS 2026Q2 active CWS estimate for IL0430050)
Municipal Department
Service area: CARPENTERSVILLE
Population: 37983 people (EPA SDWIS 2026Q2 active CWS estimate for IL0890200)
Municipal Department
Service area: HANOVER PARK
Population: 37470 people (EPA SDWIS 2026Q2 active CWS estimate for IL0314480)
Municipal Department
Service area: CALUMET CITY
Population: 37000 people (EPA SDWIS 2026Q2 active CWS estimate for IL0310390)
Illinois directory notes
This state hub brings together 156 indexed community water systems, from city departments and public authorities to investor-owned systems and smaller regional providers. A service area may cross municipal boundaries, so use the provider name and service address on your bill when choosing a profile.
The most important distinction is between a directory listing and an official account channel. Water Ledger provides a structured starting point; the utility’s own payment portal, published rate schedule, customer-service office, and mailed notice control your account. Compare the payment route, billing frequency, emergency number, and customer-protection notes before relying on a page for a time-sensitive decision.
If you are helping a household with a high bill, leak, or delinquency notice, open the utility profile and review the payment, shut-off, and leak-adjustment guides together. Keep the bill, account number, confirmation receipts, repair records, and notice dates available when speaking with the provider.