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Public water systems in Illinois

408 public water systems in Illinois, 3rd among the states. Community drinking-water systems owned by a local, state or federal government and serving 3,301 people or more, from EPA's Safe Drinking Water Information System. Private and tribal systems are not included.

Public water systemPopulation served
CHICAGO2,721,308
AURORA183,000
JOLIET160,000
NAPERVILLE156,406
ROCKFORD147,051
SPRINGFIELD117,444
ELGIN114,797
WAUKEGAN87,149
CICERO83,000
BLOOMINGTON77,610
DECATUR76,122
SCHAUMBURG75,750
EVANSTON74,486
ARLINGTON HEIGHTS73,320
PALATINE70,875
SKOKIE66,422
DES PLAINES60,675
OAK LAWN58,362
ORLAND PARK58,020
BERWYN57,250
TINLEY PARK56,703
OAK PARK54,583
WHEATON53,970
NORMAL52,736
ROMEOVILLE50,458
HOFFMAN ESTATES50,179
PLAINFIELD50,000
DOWNERS GROVE49,425
GLENVIEW47,856
O FALLON46,603
ELMHURST45,000
MOLINE44,500
LOMBARD44,476
BUFFALO GROVE43,212
QUINCY42,000
BARTLETT41,500
MOUNT PROSPECT41,000
CRYSTAL LAKE40,661
DEKALB40,290
CAROL STREAM39,854
PARK RIDGE39,800
WHEELING39,725
STREAMWOOD39,577
ROCK ISLAND39,018
OSWEGO38,169
ADDISON38,017
CARPENTERSVILLE37,983
HANOVER PARK37,470
CALUMET CITY37,000
NORTH PARK PWD35,580
NORTHBROOK34,407
WOODRIDGE33,566
VERNON HILLS - LAKE CO PW33,207
GLENDALE HEIGHTS33,176
ST CHARLES33,103
ELK GROVE VILLAGE31,802
GALESBURG31,620
MUNDELEIN31,500
ALGONQUIN30,700
GURNEE30,193
HIGHLAND PARK30,176
SOUTH STICKNY SD30,000
COLLINSVILLE29,500
NILES29,350
LANSING29,076
MONTGOMERY28,956
GLEN ELLYN28,850
LAKE IN THE HILLS28,661
HUNTLEY28,495
NEW LENOX27,690
OAK FOREST27,478
ROUND LAKE BEACH27,200
WILMETTE27,087
EDWARDSVILLE26,808
CHICAGO HEIGHTS26,184
BATAVIA26,098
WOODSTOCK25,630
BELVIDERE25,339
MORTON GROVE25,297
WEST CHICAGO25,166
ELMWOOD PARK25,000
HARVEY25,000
ZION24,442
LISLE24,223
MELROSE PARK24,206
WESTMONT24,161
MAYWOOD24,090
FRANKFORT24,000
SOUTH ELGIN23,648
LOVES PARK23,335
ROLLING MEADOWS23,329
LOCKPORT23,100
GREAT LAKES NAVAL TRAINING STATION23,000
YORKVILLE23,000
ROSELLE22,897
MCHENRY22,335
EAST PEORIA22,284
CARBONDALE22,107
BLOOMINGDALE22,018
SOUTH HOLLAND22,000
DARIEN21,751
PARK FOREST21,687
BLUE ISLAND21,494
EAST MOLINE21,374
GRAYSLAKE21,248
GENEVA21,247
CREST HILL21,169
DOLTON20,510
LIBERTYVILLE20,500
EVERGREEN PARK19,943
JACKSONVILLE19,903
MOKENA19,887
LAKE ZURICH19,759
LAKE FOREST19,642
MATTOON19,500
HOMEWOOD19,463
DEERFIELD19,196
BELLWOOD19,156
ALSIP19,063
BROOKFIELD18,776
SHOREWOOD18,645
BENSENVILLE18,537
PALOS HILLS18,530
SYCAMORE18,500
FRANKLIN PARK18,467
JUSTICE-WILLOW SPRINGS WATER COMMISSION18,450
ROUND LAKE18,430
MATTESON18,293
NORTH AURORA18,261
OTTAWA18,097
HINSDALE17,900
CARY17,826
LEMONT17,500
CHARLESTON17,286
MORTON17,111
TROY16,962
MARION16,855
NORTH CHICAGO16,813
CANTON16,748
COUNTRY CLUB HILLS16,500
BRIDGEVIEW16,467
CHATHAM16,423
WESTCHESTER16,241
LA GRANGE16,200
MOUNT VERNON15,793
PALOS HEIGHTS15,500
WAUCONDA15,349
NORRIDGE15,251
BETHALTO15,210
DIXON15,096
MACOMB15,051
WILDWOOD SUBDIVISION - LAKE CO PW14,832
MIDLOTHIAN14,819
WASHINGTON14,793
MORRIS14,775
HICKORY HILLS14,505
LINDENHURST14,500
FOREST PARK14,340
ANTIOCH14,175
CHICAGO RIDGE14,130
WOOD DALE14,012
CASEYVILLE13,798
HAZEL CREST13,792
LINCOLNWOOD13,463
CHANNAHON13,380
WESTERN SPRINGS13,274
LA GRANGE PARK13,011
RANTOUL13,000
U OF I-CHAMPAIGN13,000
NORTHLAKE12,840
TAYLORVILLE12,806
MINOOKA12,800
HERRIN12,747
GLEN CARBON12,618
PLANO12,600
CAHOKIA HEIGHTS12,528
KEWANEE12,509
RICHTON PARK12,504
MARKHAM12,500
WINNETKA12,475
WARRENVILLE12,350
EFFINGHAM12,252
CENTRALIA12,182
FOX LAKE11,780
RIVER FOREST11,717
SCHILLER PARK11,709
LAKE OF EGYPT PWD11,368
ROBINSON-PALESTINE WATER COMMISSION11,331
SUGAR GROVE11,243
BURR RIDGE11,192
SUMMIT11,161
COLUMBIA11,129
WORTH10,970
CRESTWOOD10,826
HIGHLAND10,674
WOOD RIVER10,464
PINGREE GROVE10,365
MANHATTAN10,340
BARRINGTON10,327
LYONS10,304
PERU10,300
RIVER GROVE10,282
RIVERDALE10,266
MURPHYSBORO10,241
WATERLOO10,190
MARYVILLE10,150
LEYDEN TWSP WATER DISTRICT10,000
SAUK9,921
WINFIELD9,835
LA SALLE9,700
STEGER9,700
CLARK-EDGAR RWD9,657
ITASCA9,506
HARVARD9,469
ROCHELLE9,446
OAK BROOK9,400
FLOSSMOOR9,371
RIVERSIDE9,298
LYNWOOD9,149
PARIS9,100
HARWOOD HEIGHTS9,065
WILLOWBROOK9,000
GLENWOOD8,956
MONMOUTH8,902
OLNEY8,877
GLENCOE8,849
LAKE VILLA8,829
MASCOUTAH8,759
BEACH PARK8,710
CLARENDON HILLS8,702
WEST FRANKFORT8,650
ROCK FALLS8,620
HARRISBURG8,524
CALUMET PARK8,442
IL AMERICAN-JERSEYVILLE8,412
CHESTER8,407
GILBERTS8,366
GREENVILLE8,310
CRETE8,275
HILLSIDE8,200
BENTON8,104
ISLAND LAKE8,066
WESTERN ILLINOIS UNIVERSITY8,000
FOSTERBURG PWD7,940
LINCOLNSHIRE7,940
SALEM7,905
LONG CREEK TOWNSHIP PWS7,850
BROADVIEW7,847
WEST DUNDEE7,845
PRINCETON7,832
ROCK ISLAND ARSENAL, US ARMY7,800
HAMPSHIRE7,758
ROCKTON7,685
NORTH TAZEWELL PWD7,625
VANDALIA7,616
MARENGO7,572
SILVIS7,473
CLINTON7,200
DUQUOIN7,169
SANDWICH7,156
MENDOTA7,100
NORTH RIVERSIDE7,071
MOUNT CARMEL7,015
SOUTHEAST REGIONAL WATER FACILITY6,940
STICKNEY6,902
AMERICAN WATER OPER AND MAINTENANCE, LLC6,779
CHILLICOTHE6,660
CURRAN-GARDNER TOWNSHIP PWD6,651
LITCHFIELD6,648
VOLO6,629
ILLINOIS STATE UNIVERSITY-NORMAL6,600
LA GRANGE HIGHLANDS SANITARY DISTRICT6,600
CARLINVILLE6,598
MAHOMET6,580
WINTHROP HARBOR6,565
ELBURN6,559
GENESEO6,539
CARTERVILLE6,528
NORTHERN ILLINOIS UNIVERSITY-DEKALB6,500
COUNTRYSIDE6,420
DALLAS RURAL WATER DISTRICT6,370
METROPOLIS6,309
CARMI6,307
FORT MASSAC PWD6,290
FAIRFIELD6,202
WILLIAMSVILLE6,198
BRAIDWOOD6,194
BEARDSTOWN5,951
PEORIA HEIGHTS5,908
MOUNT ZION5,833
PINCKNEYVILLE5,804
HOOPESTON5,802
PANA5,800
EAST ALTON5,786
STAUNTON5,756
MILL CREEK PWD5,755
GRANDWOOD PARK SUBDIVISION - LAKE CO PW5,751
COAL CITY5,749
WILMINGTON5,700
LAKE BLUFF5,600
SHELBYVILLE5,600
SPRING VALLEY5,582
MILLSTONE PWD5,565
MONTICELLO5,548
EASTERN ILLINOIS UNIVERSITY5,500
WATSEKA5,500
NORTHFIELD5,470
PARK CITY5,425
ROBBINS5,415
PIKE COUNTY PWD 15,375
HIGHWOOD5,335
POSEN5,331
SANGAMON VALLEY PWD5,300
GENOA5,298
MITCHELL PWD5,253
FLORA5,233
EUREKA5,216
BERKELEY5,214
MONEE5,148
CATERPILLAR TRAIL PWD5,125
MARSEILLES5,061
BRIGHTON5,041
SOUTH HIGHWAY PWD4,972
MURDALE PWD4,963
MILAN4,945
CREVE COEUR4,934
OLYMPIA FIELDS4,922
ANNA4,910
ROUND LAKE PARK4,900
TUSCOLA4,875
PALOS PARK4,873
WEST PRAIRIE WATER COMPANY4,800
BREESE4,772
CHERRY VALLEY4,731
SULLIVAN4,729
PETERSBURG4,725
ELDORADO4,715
LEBANON4,714
BEECHER4,713
FREEBURG4,707
FOX RIVER GROVE4,702
PITTSFIELD4,697
DUPO4,684
CALHOUN COUNTY RWD4,675
STONE PARK4,576
ATHENS4,575
AUBURN4,574
LAWRENCEVILLE4,524
OGLESBY4,500
HILLSBORO4,402
DWIGHT4,400
CORTLAND4,398
SPARTA4,395
SMITHTON4,381
RIVERTON4,279
LAKEWOOD4,267
HOMETOWN4,240
GEORGETOWN4,200
PAXTON4,200
MORRISON4,188
AQUA ILLINOIS-PEOTONE4,182
NEW BADEN4,178
MILLSTADT4,071
COAL VALLEY PWD4,023
WASCO SD4,000
BURNHAM3,989
NORTH EAST CENTRAL PWD3,975
HAMILTON COUNTY WATER DISTRICT3,958
ROSEMONT3,952
MARSHALL3,947
CORINTH PWD3,927
SOUTH CHICAGO HEIGHTS3,924
SALINE VALLEY CONSERVANCY DISTRICT3,921
WESTVILLE3,917
METAMORA3,895
COAL VALLEY3,873
WONDER LAKE3,870
ROCHESTER3,856
RED BUD3,804
GREENE COUNTY RWD3,786
BYRON3,784
PLEASANT VALLEY PWD3,783
GILLESPIE3,737
LCPW - PEKARA SUBDIVISION3,711
FOUNTAIN WATER DISTRICT3,650
REND LAKE INTER-CITY WATER SYSTEM3,650
FAIRBURY3,633
RIVERWOODS3,618
IL AMERICAN-TOLONO3,604
WOODLAWN3,587
THREE COUNTY PWD3,575
HAINESVILLE3,528
WESTERN WAYNE WATER DISTRICT3,516
JOHNSTON CITY3,509
SOUTH JACKSONVILLE3,501
GIBSON CITY3,500
LE ROY3,498
FORSYTH3,490
ALEDO3,470
TRITOWNSHIP WATER DISTRICT3,470
OREGON3,449
HARDINVILLE WATER COMPANY3,403
MACKINAW3,399
RUSHVILLE3,375
CARLYLE3,373
FULTON3,346
PONTOON BEACH PWD3,325
GALENA3,308

Largest first by population served, as each employer reports it to its federal registry.

Source: U.S. Environmental Protection Agency, Safe Drinking Water Information System (SDWIS/Fed), community water systems. Data captured October 2, 2026.

Jobs at public water systems

Water / Wastewater Treatment Operator

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Public water systems in other states

Texas · 1,133California · 523Alabama · 294Florida · 286Michigan · 284Tennessee · 276New York · 266Pennsylvania · 259Massachusetts · 254Ohio · 243Georgia · 242North Carolina · 237Washington · 211New Jersey · 205Missouri · 200Kentucky · 190Louisiana · 190Minnesota · 185Wisconsin · 185Indiana · 176Colorado · 167Arkansas · 157South Carolina · 143Oklahoma · 142Virginia · 142Utah · 116Iowa · 112Oregon · 111Mississippi · 107Kansas · 88West Virginia · 82Maryland · 69Arizona · 63New Mexico · 53Idaho · 43Nebraska · 43New Hampshire · 38Hawaii · 34Montana · 32Vermont · 32Maine · 31South Dakota · 31Connecticut · 30Nevada · 28Wyoming · 28Rhode Island · 26Delaware · 20North Dakota · 18Alaska · 16District of Columbia · 3

All public water systems in the U.S. · Illinois government jobs