Illinois Water Quality
Health violation data for 1,783 community water systems in Illinois. Based on EPA Safe Drinking Water Information System (SDWIS) data.
Water Systems
1,783
Total Violations
2,825
Systems with Violations
50
Cities with Issues
473
Water Systems with Most Violations
| # | Water System | Violations | Health |
|---|---|---|---|
| 1 | DONNELLSON Donnellson | 65 | Yes |
| 2 | BUDA Peru | 63 | Yes |
| 3 | LYNWOOD 3RD ADDITION Geneseo | 59 | Yes |
| 4 | GENESEO HICKORY HILLS HOA Geneseo | 53 | Yes |
| 5 | SHANNON Shannon | 52 | Yes |
| 6 | LAND AND WTR ASSN Ottawa | 46 | Yes |
| 7 | DANVERS Danvers | 43 | Yes |
| 8 | MAEYSTOWN Maeystown | 43 | Yes |
| 9 | CARLOCK Carlock | 42 | Yes |
| 10 | GREENFIELD Greenfield | 40 | Yes |
| 11 | VERMONT Vermont | 38 | Yes |
| 12 | FOUNTAIN VALLEY MHP Rantoul | 30 | Yes |
| 13 | COMPTON Compton | 29 | Yes |
| 14 | SECOR Secor | 29 | Yes |
| 15 | NEW SALEM PWD Adair | 28 | Yes |
| 16 | CHRISMAN Chrisman | 26 | Yes |
| 17 | CHENOA Chenoa | 26 | Yes |
| 18 | APPLE CREEK WATER COOP Jacksonville | 24 | Yes |
| 19 | PINCKNEYVILLE Pinckneyville | 23 | Yes |
| 20 | BEECHER CITY Beecher City | 22 | Yes |
| 21 | MOUNT ZION Mount Zion | 22 | Yes |
| 22 | LICK CREEK PWD Buncombe | 22 | Yes |
| 23 | EDINBURG Edinburg | 21 | Yes |
| 24 | FOX LAWN HOMEOWNERS WATER ASSOCIATION Yorkville | 21 | Yes |
| 25 | EJ WATER-SANGCHRIS Dieterich | 21 | Yes |
| 26 | COAL CITY Coal City | 19 | Yes |
| 27 | MULBERRY GROVE Mulberry Grove | 18 | Yes |
| 28 | TABLE GROVE Table Grove | 18 | Yes |
| 29 | MACOMB Macomb | 18 | Yes |
| 30 | SCOTTVILLE RURAL WATER COMPANY, INC. Palmyra | 18 | Yes |
| 31 | ANNA Anna | 18 | Yes |
| 32 | JASPER WATERWORKS CORPORATION Fairfield | 18 | Yes |
| 33 | LE ROY Leroy | 17 | Yes |
| 34 | TRENTON Trenton | 16 | Yes |
| 35 | DES PLAINES MHP Desplaines | 16 | Yes |
| 36 | HETTICK Hettick | 16 | Yes |
| 37 | ROCHELLE Rochelle | 16 | Yes |
| 38 | ILLIOPOLIS Illiopolis | 16 | Yes |
| 39 | SOUTH PALMYRA WATER COMMISSION Palmyra | 15 | Yes |
| 40 | PALMYRA Modesto | 15 | Yes |
| 41 | PALMYRA-MODESTO WATER COMMISSION Modesto | 15 | Yes |
| 42 | SPARTA Sparta | 15 | Yes |
| 43 | HINCKLEY Hinckley | 14 | Yes |
| 44 | REDDICK Peru | 14 | Yes |
| 45 | NORTH TAZEWELL PWD East Peoria | 14 | Yes |
| 46 | DEVILS KITCHEN WATER DISTRICT Carbondale | 14 | Yes |
| 47 | STEWARD Steward | 13 | Yes |
| 48 | CAMARGO Camargo | 12 | Yes |
| 49 | DE LAND Westville | 12 | Yes |
| 50 | EXETER-MERRITT WATER COOP Winchester | 12 | Yes |
Most Common Contaminants in Illinois
| Contaminant | Violations | Systems Affected |
|---|---|---|
| Combined Radium 226/228 | 744 | 377 |
| Total Trihalomethanes (TTHM) | 549 | 59 |
| Barium | 346 | 28 |
| Lead & Copper Rule | 320 | 32 |
| Haloacetic Acids (HAA5) | 199 | 26 |
| Gross Alpha | 148 | 148 |
| Chloroform | 147 | 24 |
| Turbidity | 120 | 30 |
| Nitrate | 74 | 11 |
| E. coli | 35 | 22 |
| PFOA + PFOS | 25 | 4 |
| Copper | 25 | 3 |
| Fluoride | 21 | 6 |
| Contaminant 1041 | 17 | 5 |
| Chromium | 14 | 4 |
Cities with Water Quality Issues
Antioch Cary Fox River Grove Glenview Grayslake Harvard Lake Bluff Mchenry Morton Grove Mundelein Vernon Hills Northbrook North Chicago Palatine Lincolnshire Skokie Waukegan Wheeling Woodstock Elgin Algonquin Bartlett Bellwood Dekalb Elburn Elmhurst Geneva Hampshire Huntley Kirkland Broadview Melrose Park Schiller Park South Elgin Schaumburg Evanston Blue Island Calumet City Coal City Elwood +433 more
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About This Data
Water quality data is from the EPA Safe Drinking Water Information System (SDWIS). Health-based violations include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations. Only community water systems (CWS) in Illinois are included.
Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services U.S. Environmental Protection Agency, SDWIS Federal Reporting Services
Read our methodology - how this data is sourced, computed, and verified.