Illinois
1,737 Utilities
Serving: 13,082,000
Data available: 2010-2015
Contaminants Found: 94
EWG's drinking water quality report for Illinois shows results of tests conducted by the water utilities in Illinois and provided to EWG by the Illinois Environmental Protection Agency.
Below are utilities in Illinois serving over 10,000 people, listed alphabetically. Click the "more" button below to get the full list of utilities serving over 10,000 people.
Large utilities in Illinois
| Utility | Location | People Served |
|---|---|---|
| Addison | Addison, IL | 38,090 |
| Algonquin | Algonquin, IL | 33,000 |
| Alsip | Alsip, IL | 20,500 |
| Antioch | Antioch, IL | 13,724 |
| Aqua Illinois - Kankakee | Kankakee, IL | 76,299 |
| Aqua Illinois-Vermilion County | Danville, IL | 38,000 |
| Arlington Heights | Arlington Heights, IL | 76,943 |
| Aurora | Aurora, IL | 171,000 |
| Barrington | Barrington, IL | 10,168 |
| Bartlett | Bartlett, IL | 41,442 |
| Batavia | Batavia, IL | 26,348 |
| Bellwood | Bellwood, IL | 20,535 |
| Belvidere | Belvidere, IL | 23,500 |
| Bensenville | Bensenville, IL | 20,703 |
| Berwyn | Berwyn, IL | 55,000 |
| Bethalto | Bethalto, IL | 17,500 |
| Bloomingdale | Bloomingdale, IL | 21,675 |
| Bloomington | Bloomington, IL | 75,975 |
| Blue Island | Blue Island, IL | 23,463 |
| Bridgeview | Bridgeview, IL | 15,500 |
| Brookfield | Brookfield, IL | 19,085 |
| Buffalo Grove | Buffalo Grove, IL | 44,411 |
| Burr Ridge | Burr Ridge, IL | 11,259 |
| Calumet City | Calumet City, IL | 39,071 |
| Canton | Canton, IL | 13,932 |
| Carbondale | Carbondale, IL | 25,597 |
| Carol Stream | Carol Stream, IL | 40,438 |
| Carpentersville | Carpentersville, IL | 30,586 |
| Cary | Cary, IL | 18,713 |
| Caseyville | Caseyville, IL | 12,337 |
Utilities that accumulated/accrued the most violation points as of January to March 2017 in Illinois
The Environmental Protection Agency's Enforcement and Compliance History Online (ECHO) database collects compliance and enforcement-related information for drinking water utilities nationwide. ECHO water quality violation scores take into account federal health-based water quality standards, as well as monitoring, reporting and other drinking water quality requirements. Points are accrued based on specific problems at the utility - violations of health-based drinking water standards receive more points than monitoring and reporting violations - and the length of time until the violations were corrected.
Large utilities that accumulated/accrued the most violation points as of January to March 2017 in Illinois
The Environmental Protection Agency's Enforcement and Compliance History Online (ECHO) database collects compliance and enforcement-related information for drinking water utilities nationwide. ECHO water quality violation scores take into account federal health-based water quality standards, as well as monitoring, reporting and other drinking water quality requirements. Points are accrued based on specific problems at the utility - violations of health-based drinking water standards receive more points than monitoring and reporting violations - and the length of time until the violations were corrected.
| Utility | Location | People Served | Violation Points |
|---|---|---|---|
| Oswego | Oswego, IL | 25,855 | 5 |
| Chicago Heights | Chicago Heights, IL | 33,072 | 2 |
| North Lake | Northlake, IL | 11,878 | 1 |
| Shorewood | Shorewood, IL | 15,783 | 1 |
| Romeoville | Romeoville, IL | 50,001 | 1 |
| Warrenville | Warrenville, IL | 12,310 | 1 |
| Hanover Park | Hanover Park, IL | 38,278 | 1 |
| St Charles | St Charles, IL | 32,190 | 1 |
| Evergreen Park | Evergreen Park, IL | 20,821 | 1 |
| Oak Lawn | Oak Lawn, IL | 55,136 | 1 |
| Troy | Troy, IL | 15,000 | 1 |
| Calumet City | Calumet City, IL | 39,071 | 1 |
Contaminants found in Illinois above health guidelines
| Found above health guidelines | Found | ||||||
|---|---|---|---|---|---|---|---|
| Contaminant | # of Utilities | People Served | # of Utilities | People Served | |||
Total trihalomethanes (TTHMs) | 1,258 | 12,631,907 | 1,276 | 12,671,080 | |||
Bromodichloromethane | 1,132 | 12,388,806 | 1,133 | 12,389,019 | |||
Chloroform | 1,171 | 12,360,077 | 1,220 | 12,524,518 | |||
Dibromochloromethane | 1,005 | 11,752,448 | 1,055 | 12,091,132 | |||
Trichloroacetic acid | 883 | 11,472,664 | 888 | 11,561,686 | |||
Dichloroacetic acid | 893 | 11,129,861 | 900 | 11,198,963 | |||
Radium-226 | 1,454 | 11,107,086 | 1,465 | 11,118,653 | |||
Radium-228 | 1,429 | 10,830,584 | 1,432 | 10,838,335 | |||
Chromium (hexavalent) | 581 | 10,713,464 | 642 | 11,264,077 | |||
Arsenic | 625 | 3,005,167 | 625 | 3,005,167 | |||
Chlorate | 49 | 456,407 | 272 | 3,769,304 | |||
Strontium | 69 | 398,823 | 1,075 | 12,359,890 | |||
1,4-Dioxane | 19 | 370,016 | 143 | 2,542,270 | |||
Chlorite | 84 | 369,485 | 92 | 388,540 | |||
Manganese | 106 | 340,162 | 679 | 3,098,915 | |||
Nitrate and nitrite | 98 | 302,684 | 789 | 8,669,922 | |||
Bromoform | 56 | 301,904 | 381 | 2,670,267 | |||
Atrazine | 113 | 291,017 | 128 | 478,974 | |||
Bromate | 16 | 217,855 | 16 | 217,855 | |||
Uranium | 10 | 217,770 | 51 | 830,520 | |||
Tetrachloroethylene (perchloroethylene) | 9 | 207,625 | 9 | 207,625 | |||
Nitrate | 86 | 184,685 | 999 | 9,756,243 | |||
Perfluorooctanoic acid (PFOA) | 16 | 151,683 | 16 | 151,683 | |||
Benzo[a]pyrene | 3 | 44,401 | 3 | 44,401 | |||
Vinyl chloride | 5 | 36,730 | 5 | 36,730 | |||
Barium | 24 | 35,457 | 1,168 | 10,683,242 | |||
Perfluorooctane sulfonate (PFOS) | 1 | 26,443 | 1 | 26,443 | |||
Perfluorohexane sulfonate (PFHXS) | 2 | 24,480 | 2 | 24,480 | |||
Molybdenum | 4 | 8,191 | 445 | 10,870,523 | |||
Tritium | 2 | 6,472 | 2 | 6,472 | |||
Antimony | 2 | 1,068 | 2 | 1,068 | |||
Cadmium | 2 | 910 | 2 | 910 | |||
Di(2-ethylhexyl) phthalate | 2 | 205 | 4 | 40,969 | |||
Contaminants found in Illinois above legal limits
| Contaminant | # of Utilities | People Served | |
|---|---|---|---|
Radium, combined (-226 & -228) | 38 | 683,201 | |
Total trihalomethanes (TTHMs) | 7 | 13,607 | |
Nitrate and nitrite | 6 | 7,803 | |
Arsenic | 10 | 7,109 | |
Haloacetic acids (HAA5) | 5 | 4,474 | |
Barium | 2 | 705 | |
Nitrate | 1 | 230 |