Illinois Water Systems
1,785 community water systems in Illinois, ranked by violation count. Data from EPA Safe Drinking Water Information System (SDWIS).
Water Systems
1,785
Health-Based Violation Records
3,029
Health Violations
660 systems
Population Served
12,090,647
Illinois community water systems are regulated by the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act; each utility files compliance results with the state's primacy agency and, for federally listed contaminants, with the U.S. Environmental Protection Agency directly. PlainEnviro's health-based SDWIS extract above counts health-based exceedances only -- monitoring and reporting violations are not present in these figures.
Violation counts reflect both infrastructure realities and reporting diligence, a state with more small rural systems will accumulate more monitoring-type violations without necessarily delivering worse water. Health-based violations are the stronger safety signal. A past violation does not itself indicate current unsafe water; utilities must notify customers, remediate, and publish an annual Consumer Confidence Report. All numbers below draw directly from the federal SDWIS record.
Which water systems have violations? (191)
| # | System Name | Violations | Health |
|---|---|---|---|
| 1 | PINCKNEYVILLE Pinckneyville | 24 | Yes |
| 2 | MOUNT ZION Mount Zion | 23 | Yes |
| 3 | MACOMB Macomb | 22 | Yes |
| 4 | COAL CITY Coal City | 19 | Yes |
| 5 | ANNA Anna | 18 | Yes |
| 6 | LE ROY Leroy | 18 | Yes |
| 7 | ROCHELLE Rochelle | 16 | Yes |
| 8 | TRENTON Trenton | 16 | Yes |
| 9 | SPARTA Sparta | 15 | Yes |
| 10 | NORTH TAZEWELL PWD East Peoria | 14 | Yes |
| 11 | SOUTH HIGHWAY PWD Makanda | 13 | Yes |
| 12 | LOVES PARK Loves Park | 12 | Yes |
| 13 | CARBONDALE Carbondale | 11 | Yes |
| 14 | LEMONT Lemont | 11 | Yes |
| 15 | LAKE OF EGYPT PWD Marion | 11 | Yes |
| 16 | LA SALLE La Salle | 11 | Yes |
| 17 | LAKESIDE PWD Carbondale | 11 | Yes |
| 18 | MILLSTONE PWD Nashville | 10 | Yes |
| 19 | NORTH CHICAGO North Chicago | 9 | Yes |
| 20 | FAYETTE WATER COMPANY Brownstown | 9 | Yes |
| 21 | MILAN Milan | 9 | Yes |
| 22 | SOUTH HOLLAND South Holland | 8 | Yes |
| 23 | CASEY Casey | 8 | Yes |
| 24 | ARCOLA Arcola | 8 | Yes |
| 25 | OTTAWA Ottawa | 7 | Yes |
| 26 | BURNSIDE PWD New Burnside | 7 | Yes |
| 27 | MENDOTA Mendota | 6 | Yes |
| 28 | CHERRY VALLEY Cherry Valley | 6 | Yes |
| 29 | HILLSBORO Hillsboro | 6 | Yes |
| 30 | DWIGHT Dwight | 6 | Yes |
| 31 | RED BUD Red Bud | 6 | Yes |
| 32 | IL AMERICAN-TOLONO Godfrey | 6 | Yes |
| 33 | ABINGDON Monmouth | 6 | Yes |
| 34 | BARTLETT Bartlett | 5 | Yes |
| 35 | LAKE FOREST Lake Forest | 5 | Yes |
| 36 | IL AMERICAN-LINCOLN Godfrey | 5 | Yes |
| 37 | SADDLEBROOK FARMS Grayslake | 5 | Yes |
| 38 | AQUA ILLINOIS-KANKAKEE Glenview | 4 | Yes |
| 39 | MINOOKA Minooka | 4 | Yes |
| 40 | LYONS Lyons | 4 | Yes |
| 41 | RIVERSIDE Riverside | 4 | Yes |
| 42 | PRINCETON Princeton | 4 | Yes |
| 43 | HAMPSHIRE Hampshire | 4 | Yes |
| 44 | NORTH RIVERSIDE North Riverside | 4 | Yes |
| 45 | AQUA ILLINOIS-UNIVERSITY PARK Glenview | 4 | Yes |
| 46 | SALINE VALLEY CONSERVANCY DISTRICT Eldorado | 4 | Yes |
| 47 | THREE COUNTY PWD New Douglas | 4 | Yes |
| 48 | HOLIDAY SHORES SD Edwardsville | 4 | Yes |
| 49 | BERWYN Berwyn | 3 | Yes |
| 50 | CREST HILL Crest Hill | 3 | Yes |
| 51 | BELLWOOD Bellwood | 3 | Yes |
| 52 | ANTIOCH Antioch | 3 | Yes |
| 53 | CASEYVILLE Caseyville | 3 | Yes |
| 54 | RICHTON PARK Richton Park | 3 | Yes |
| 55 | SCHILLER PARK Schiller Park | 3 | Yes |
| 56 | PERU Peru | 3 | Yes |
| 57 | RIVERDALE Riverdale | 3 | Yes |
| 58 | STEGER Manteno | 3 | Yes |
| 59 | MONMOUTH Monmouth | 3 | Yes |
| 60 | BROADVIEW Broadview | 3 | Yes |
| 61 | VANDALIA Vandalia | 3 | Yes |
| 62 | LITCHFIELD Litchfield | 3 | Yes |
| 63 | FORT MASSAC PWD Metropolis | 3 | Yes |
| 64 | STAUNTON Staunton | 3 | Yes |
| 65 | LAKE BLUFF Lake Bluff | 3 | Yes |
| 66 | COAL VALLEY Coal Valley | 3 | Yes |
| 67 | WONDER LAKE Wonder Lake | 3 | Yes |
| 68 | HAINESVILLE Vernon Hills | 3 | Yes |
| 69 | FULTON Fulton | 3 | Yes |
| 70 | DIXMOOR Dixmoor | 3 | Yes |
| 71 | JOLIET | 2 | Yes |
| 72 | IL AMERICAN-PEORIA Godfrey | 2 | Yes |
| 73 | WAUKEGAN Waukegan | 2 | Yes |
| 74 | CICERO Cicero | 2 | Yes |
| 75 | PALATINE Palatine | 2 | Yes |
| 76 | OAK LAWN Oak Lawn | 2 | Yes |
| 77 | OAK PARK Oak Park | 2 | Yes |
| 78 | GLENVIEW Glenview | 2 | Yes |
| 79 | O FALLON O'fallon | 2 | Yes |
| 80 | WHEELING Wheeling | 2 | Yes |
| 81 | CALUMET CITY Calumet City | 2 | Yes |
| 82 | ALGONQUIN Algonquin | 2 | Yes |
| 83 | AQUA ILLINOIS-NORTH MAINE UTILITIES Glenview | 2 | Yes |
| 84 | EJ WATER COOPERATIVE Dieterich | 2 | Yes |
| 85 | HUNTLEY Huntley | 2 | Yes |
| 86 | MORTON GROVE Morton Grove | 2 | Yes |
| 87 | MAYWOOD Maywood | 2 | Yes |
| 88 | FRANKFORT Frankfort | 2 | Yes |
| 89 | PARK FOREST Park Forest | 2 | Yes |
| 90 | GRAYSLAKE Grayslake | 2 | Yes |
| 91 | HOMEWOOD Homewood | 2 | Yes |
| 92 | WESTCHESTER Westchester | 2 | Yes |
| 93 | PINGREE GROVE Pingree Grove | 2 | Yes |
| 94 | WEST DUNDEE West Dundee | 2 | Yes |
| 95 | ROCKTON Rockton | 2 | Yes |
| 96 | MOUNT CARMEL Mt Carmel | 2 | Yes |
| 97 | VOLO Volo | 2 | Yes |
| 98 | ILLINOIS STATE UNIVERSITY-NORMAL Normal | 2 | Yes |
| 99 | WILMINGTON Wilmington | 2 | Yes |
| 100 | POSEN Posen | 2 | Yes |
| 101 | FOX RIVER GROVE Fox River Grove | 2 | Yes |
| 102 | CALHOUN COUNTY RWD Hardin | 2 | Yes |
| 103 | LAWRENCEVILLE Lawrenceville | 2 | Yes |
| 104 | WOODHAVEN Sublette | 2 | Yes |
| 105 | FORSYTH Forsyth | 2 | Yes |
| 106 | SMG WATER COOP Winchester | 2 | Yes |
| 107 | AQUA ILLINOIS-HAWTHORN WOODS Glenview | 2 | Yes |
| 108 | MOULTRIE COUNTY RWD Sullivan | 2 | Yes |
| 109 | BRIDGEPORT Bridgeport | 2 | Yes |
| 110 | CHICAGO Chicago | 1 | Yes |
| 111 | AURORA Aurora | 1 | Yes |
| 112 | IL AMERICAN-EAST ST LOUIS Godfrey | 1 | Yes |
| 113 | BLOOMINGTON Bloomington | 1 | Yes |
| 114 | EVANSTON Evanston | 1 | Yes |
| 115 | PARK RIDGE Park Ridge | 1 | Yes |
| 116 | OSWEGO Oswego | 1 | Yes |
| 117 | NORTHBROOK Northbrook | 1 | Yes |
| 118 | GALESBURG Galesburg | 1 | Yes |
| 119 | HIGHLAND PARK Highland Park | 1 | Yes |
| 120 | AQUA ILLINOIS-VERMILION COUNTY Glenview | 1 | Yes |
| 121 | SOUTH STICKNY SD Burbank | 1 | Yes |
| 122 | WOODSTOCK Woodstock | 1 | Yes |
| 123 | ELMWOOD PARK Elmwood Park | 1 | Yes |
| 124 | MELROSE PARK Melrose Park | 1 | Yes |
| 125 | WESTMONT Westmont | 1 | Yes |
| 126 | SOUTH ELGIN South Elgin | 1 | Yes |
| 127 | LOCKPORT Lockport | 1 | Yes |
| 128 | MCHENRY Mchenry | 1 | Yes |
| 129 | BLUE ISLAND Blue Island | 1 | Yes |
| 130 | GENEVA Geneva | 1 | Yes |
| 131 | DEERFIELD Deerfield | 1 | Yes |
| 132 | CARY | 1 | Yes |
| 133 | CHARLESTON Charleston | 1 | Yes |
| 134 | TROY Troy | 1 | Yes |
| 135 | MIDLOTHIAN Midlothian | 1 | Yes |
| 136 | WASHINGTON Washington | 1 | Yes |
| 137 | HAZEL CREST Hazel Crest | 1 | Yes |
| 138 | LINCOLNWOOD Lincolonwood | 1 | Yes |
| 139 | WESTERN SPRINGS Western Springs | 1 | Yes |
| 140 | LA GRANGE PARK Lagrange Park | 1 | Yes |
| 141 | FOX LAKE Ingleside | 1 | Yes |
| 142 | RIVER FOREST River Forest | 1 | Yes |
| 143 | WASHINGTON COUNTY WATER COMPANY Nashville | 1 | Yes |
| 144 | WORTH Worth | 1 | Yes |
| 145 | BARRINGTON Barrington | 1 | Yes |
| 146 | RIVER GROVE River Grove | 1 | Yes |
| 147 | MURPHYSBORO Murphysboro | 1 | Yes |
| 148 | HARVARD Harvard | 1 | Yes |
| 149 | HARWOOD HEIGHTS Hardwood Heights | 1 | Yes |
| 150 | CLEAR WATER SERVICE CORP | 1 | Yes |
| 151 | HARRISBURG Harrisburg | 1 | Yes |
| 152 | CALUMET PARK Calumet Park | 1 | Yes |
| 153 | CHESTER Chester | 1 | Yes |
| 154 | PRAIRIE PATH WATER CO-WHISPERING HILLS | 1 | Yes |
| 155 | CRETE Crete | 1 | Yes |
| 156 | BENTON Benton | 1 | Yes |
| 157 | LINCOLNSHIRE Lincolnshire | 1 | Yes |
| 158 | MARENGO Marengo | 1 | Yes |
| 159 | SILVIS Silvis | 1 | Yes |
| 160 | DUQUOIN Duquoin | 1 | Yes |
| 161 | STICKNEY Stickney | 1 | Yes |
| 162 | ABS WATER COOP Clayton | 1 | Yes |
| 163 | MAHOMET Mahomet | 1 | Yes |
| 164 | NORTHERN ILLINOIS UNIVERSITY-DEKALB Dekalb | 1 | Yes |
| 165 | DALLAS RURAL WATER DISTRICT Hamilton | 1 | Yes |
| 166 | FAIRFIELD Fairfield | 1 | Yes |
| 167 | HOOPESTON Hoopeston | 1 | Yes |
| 168 | WATSEKA Watseka | 1 | Yes |
| 169 | NORTHFIELD Northfield | 1 | Yes |
| 170 | EUREKA Eureka | 1 | Yes |
| 171 | BERKELEY Berkeley | 1 | Yes |
| 172 | MARSEILLES | 1 | Yes |
| 173 | ROUND LAKE PARK Round Lake Beach | 1 | Yes |
| 174 | PRAIRIE PATH WATER COMPANY-LAKE HOLIDAY St. Charles | 1 | Yes |
| 175 | ELDORADO Eldorado | 1 | Yes |
| 176 | OGLESBY Oglesby | 1 | Yes |
| 177 | BURNHAM Burnham | 1 | Yes |
| 178 | SOUTH CHICAGO HEIGHTS South Chicago Heights | 1 | Yes |
| 179 | PLEASANT VALLEY PWD Peoria | 1 | Yes |
| 180 | GILLESPIE Gillespie | 1 | Yes |
| 181 | FOUNTAIN WATER DISTRICT Valmeyer | 1 | Yes |
| 182 | FAIRBURY Fairbury | 1 | Yes |
| 183 | JOHNSTON CITY Johnston City | 1 | Yes |
| 184 | SOUTH JACKSONVILLE South Jacksonville | 1 | Yes |
| 185 | OREGON Oregon | 1 | Yes |
| 186 | GALENA Galena | 1 | Yes |
| 187 | IL AMERICAN-LIBERTY RIDGE WEST Godfrey | 1 | Yes |
| 188 | MOMENCE Momence | 1 | Yes |
| 189 | MCLEANSBORO Mcleansboro | 1 | Yes |
| 190 | SOUTH PALOS TWSP SANITARY DIST Palos Park | 1 | Yes |
| 191 | PAWNEE Pawnee | 1 | Yes |
Systems with No Violations (309)
309 water systems in Illinois have zero recorded violations. Showing the 50 largest by population served.
NAPERVILLE (156,406) IL AMERICAN-CHAMPAIGN (150,000) ROCKFORD (147,051) SPRINGFIELD (117,444) ELGIN (114,797) DECATUR (76,122) SCHAUMBURG (75,750) IL AMERICAN-WEST SUBURBAN (73,978) ARLINGTON HEIGHTS (73,320) SKOKIE (66,422) DES PLAINES (60,675) ORLAND PARK (58,020) TINLEY PARK (56,703) WHEATON (53,970) NORMAL (52,736) ROMEOVILLE (50,458) HOFFMAN ESTATES (50,179) PLAINFIELD (50,000) DOWNERS GROVE (49,425) IL AMERICAN-ALTON (46,127) ELMHURST (45,000) MOLINE (44,500) LOMBARD (44,476) BUFFALO GROVE (43,212) QUINCY (42,000) MOUNT PROSPECT (41,000) CRYSTAL LAKE (40,661) DEKALB (40,290) CAROL STREAM (39,854) STREAMWOOD (39,577) ROCK ISLAND (39,018) ADDISON (38,017) CARPENTERSVILLE (37,983) HANOVER PARK (37,470) NORTH PARK PWD (35,580) IL AMERICAN-GRANITE CITY (33,572) WOODRIDGE (33,566) VERNON HILLS - LAKE CO PW (33,207) GLENDALE HEIGHTS (33,176) ST CHARLES (33,103) ELK GROVE VILLAGE (31,802) IL AMERICAN-PEKIN (31,731) MUNDELEIN (31,500) GURNEE (30,193) COLLINSVILLE (29,500) NILES (29,350) LANSING (29,076) MONTGOMERY (28,956) GLEN ELLYN (28,850) LAKE IN THE HILLS (28,661) +259 more
All Water Systems in Illinois (1,785)
Page 1 of 36, ordered by population served.
| System | Population Served | Violations |
|---|---|---|
| CHICAGO | 2,721,308 | 1 |
| AURORA | 183,000 | 1 |
| JOLIET | 160,000 | 2 |
| NAPERVILLE | 156,406 | 0 |
| IL AMERICAN-CHAMPAIGN | 150,000 | 0 |
| ROCKFORD | 147,051 | 0 |
| IL AMERICAN-PEORIA | 137,575 | 2 |
| IL AMERICAN-EAST ST LOUIS | 131,368 | 1 |
| SPRINGFIELD | 117,444 | 0 |
| ELGIN | 114,797 | 0 |
| WAUKEGAN | 87,149 | 2 |
| CICERO | 83,000 | 2 |
| AQUA ILLINOIS-KANKAKEE | 80,000 | 4 |
| BLOOMINGTON | 77,610 | 1 |
| DECATUR | 76,122 | 0 |
| SCHAUMBURG | 75,750 | 0 |
| EVANSTON | 74,486 | 1 |
| IL AMERICAN-WEST SUBURBAN | 73,978 | 0 |
| ARLINGTON HEIGHTS | 73,320 | 0 |
| PALATINE | 70,875 | 2 |
| SKOKIE | 66,422 | 0 |
| DES PLAINES | 60,675 | 0 |
| OAK LAWN | 58,362 | 2 |
| ORLAND PARK | 58,020 | 0 |
| BERWYN | 57,250 | 3 |
| TINLEY PARK | 56,703 | 0 |
| OAK PARK | 54,583 | 2 |
| WHEATON | 53,970 | 0 |
| NORMAL | 52,736 | 0 |
| ROMEOVILLE | 50,458 | 0 |
| HOFFMAN ESTATES | 50,179 | 0 |
| PLAINFIELD | 50,000 | 0 |
| DOWNERS GROVE | 49,425 | 0 |
| GLENVIEW | 47,856 | 2 |
| O FALLON | 46,603 | 2 |
| IL AMERICAN-ALTON | 46,127 | 0 |
| ELMHURST | 45,000 | 0 |
| MOLINE | 44,500 | 0 |
| LOMBARD | 44,476 | 0 |
| BUFFALO GROVE | 43,212 | 0 |
| QUINCY | 42,000 | 0 |
| BARTLETT | 41,500 | 5 |
| MOUNT PROSPECT | 41,000 | 0 |
| CRYSTAL LAKE | 40,661 | 0 |
| DEKALB | 40,290 | 0 |
| CAROL STREAM | 39,854 | 0 |
| PARK RIDGE | 39,800 | 1 |
| WHEELING | 39,725 | 2 |
| STREAMWOOD | 39,577 | 0 |
| ROCK ISLAND | 39,018 | 0 |
Page 1 of 36 Next →
Frequently Asked Questions
How many water systems are in Illinois?
Illinois has 1,785 community water systems tracked by the EPA, serving a combined population of 12,090,647 people.
How many water systems in Illinois have health violations?
660 water systems in Illinois have health-based violations, which include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations. These represent 37% of all systems in the state.
How many health-based violation records are in this extract for Illinois?
PlainEnviro's health-based EPA SDWIS extract contains 3,029 records joined to 1,785 active community water systems in Illinois. Monitoring and reporting records are not included.
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About This Data
Water system data is from the EPA Safe Drinking Water Information System (SDWIS). Health-based violations include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations that may pose a direct risk to public health. Only community water systems (CWS) are included.
Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services
Read our methodology - how this data is sourced, computed, and verified.