Water Quality in Illinois
1,782 water systems • 1060 cities • EPA SDWIS Data
1,782
Water Systems
30,544
Total Violations
3,286
Health-Based Violations
12,123,082
Population Served
Overview
Illinois has 1,782 active community water systems serving 12,123,082 people. These systems have accumulated 30,544 EPA Safe Drinking Water Act violations on record, of which 3,286 are health-based violations (meaning a contaminant exceeded safe levels).
Common contaminants found in violations: Disinfection Byproducts, Selenium, Stage 2 DBP, Total Haloacetic Acids (HAA5), TTHM, Nitrate, HAA5, Total Organic Carbon, E. coli, Surface Water Treatment.
Cities with Most Violations in Illinois
| # | City | Violations | Health-Based | Water Systems | Population |
|---|---|---|---|---|---|
| 1 | Joliet | 2,132 | 11 | 10 | 166,002 |
| 2 | Chicago | 708 | 6 | 11 | 2,751,559 |
| 3 | Sauk Village | 556 | 0 | 1 | 9,921 |
| 4 | Peru | 480 | 89 | 19 | 16,676 |
| 5 | Ottawa | 470 | 61 | 7 | 19,288 |
| 6 | Silvis | 297 | 10 | 2 | 8,923 |
| 7 | Geneseo | 256 | 128 | 10 | 8,075 |
| 8 | Byron | 246 | 0 | 1 | 4,743 |
| 9 | Pearl City | 244 | 0 | 1 | 790 |
| 10 | Macomb | 243 | 27 | 5 | 25,773 |
Largest Cities in Illinois
| # | City | Population | Violations | Water Systems |
|---|---|---|---|---|
| 1 | Chicago | 2,751,559 | 708 | 11 |
| 2 | Godfrey | 767,103 | 140 | 53 |
| 3 | Kankakee | 189,218 | 176 | 32 |
| 4 | Aurora | 184,170 | 32 | 5 |
| 5 | Joliet | 166,002 | 2,132 | 10 |
| 6 | Naperville | 156,406 | 5 | 1 |
| 7 | Rockford | 147,796 | 87 | 7 |
| 8 | Springfield | 129,791 | 116 | 13 |
| 9 | Elgin | 116,825 | 68 | 4 |
| 10 | Waukegan | 87,149 | 21 | 1 |
All Cities in Illinois
| City | Population | Violations | Health Violations | Contaminants |
|---|---|---|---|---|
| Chicago | 2,751,559 | 708 | 6 | Disinfection Byproducts, Total Organic Carbon |
| Godfrey | 767,103 | 140 | 27 | Disinfection Byproducts, E. coli, Selenium +1 more |
| Kankakee | 189,218 | 176 | 23 | Disinfection Byproducts, E. coli, Total Organic Carbon |
| Aurora | 184,170 | 32 | 1 | Disinfection Byproducts |
| Joliet | 166,002 | 2,132 | 11 | Contaminant 1028, Disinfection Byproducts, E. coli +1 more |
| Naperville | 156,406 | 5 | 0 | |
| Rockford | 147,796 | 87 | 3 | Selenium, Stage 2 DBP |
| Springfield | 129,791 | 116 | 2 | Disinfection Byproducts |
| Elgin | 116,825 | 68 | 1 | Stage 2 DBP |
| Waukegan | 87,149 | 21 | 2 | Disinfection Byproducts |
| Decatur | 85,292 | 12 | 0 | |
| Libertyville | 84,859 | 44 | 0 | |
| Cicero | 83,000 | 13 | 2 | Disinfection Byproducts, Stage 2 DBP |
| Bloomington | 82,110 | 185 | 9 | Barium, Disinfection Byproducts, Stage 2 DBP |
| Schaumburg | 76,487 | 29 | 1 | Disinfection Byproducts |
| Evanston | 74,486 | 1 | 1 | Disinfection Byproducts |
| Arlington Heights | 73,444 | 45 | 0 | |
| Palatine | 70,875 | 4 | 2 | Disinfection Byproducts |
| Skokie | 66,422 | 16 | 0 | |
| Des Plaines | 60,676 | 4 | 0 | |
| Normal | 59,831 | 57 | 3 | Disinfection Byproducts, Stage 2 DBP |
| Orland Park | 58,862 | 2 | 0 | |
| Oak Lawn | 58,362 | 11 | 2 | Disinfection Byproducts |
| Berwyn | 57,250 | 17 | 3 | Disinfection Byproducts |
| Tinley Park | 56,703 | 7 | 0 | |
| Oak Park | 54,583 | 2 | 2 | Disinfection Byproducts |
| Wheaton | 54,269 | 18 | 2 | Disinfection Byproducts, Selenium |
| Dekalb | 51,530 | 20 | 1 | Disinfection Byproducts |
| Moline | 50,739 | 63 | 1 | Stage 2 DBP |
| Romeoville | 50,458 | 67 | 0 | |
| Plainfield | 50,260 | 26 | 10 | Barium, Disinfection Byproducts |
| Hoffman Estates | 50,179 | 0 | 0 | |
| Downers Grove | 49,425 | 6 | 0 | |
| Quincy | 48,254 | 72 | 0 | |
| Glenview | 48,088 | 12 | 2 | Disinfection Byproducts |
| Rock Island | 46,818 | 50 | 0 | |
| O'Fallon | 46,603 | 2 | 2 | Disinfection Byproducts |
| Elmhurst | 45,001 | 1 | 0 | |
| Northbrook | 44,654 | 122 | 1 | Disinfection Byproducts |
| Lombard | 44,476 | 1 | 0 | |
| St. Charles | 44,438 | 165 | 5 | Disinfection Byproducts, Stage 2 DBP |
| Buffalo Grove | 43,212 | 8 | 0 | |
| Dieterich | 42,520 | 219 | 35 | Disinfection Byproducts, Gross Alpha, TTHM +1 more |
| Mchenry | 42,152 | 163 | 8 | Disinfection Byproducts, E. coli, Stage 2 DBP |
| Bartlett | 41,500 | 6 | 5 | Disinfection Byproducts |
| Mount Prospect | 41,000 | 31 | 0 | |
| Crystal Lake | 40,661 | 23 | 0 | |
| Carol Stream | 39,854 | 8 | 0 | |
| Park Ridge | 39,800 | 18 | 1 | Disinfection Byproducts |
| Wheeling | 39,725 | 4 | 2 | E. coli |
| East Peoria | 39,626 | 109 | 14 | Disinfection Byproducts, TTHM, Total Haloacetic Acids (HAA5) |
| Streamwood | 39,577 | 5 | 0 | |
| Addison | 38,407 | 47 | 1 | Stage 2 DBP |
| Oswego | 38,169 | 11 | 1 | Total Organic Carbon |
| Carpentersville | 37,983 | 1 | 0 | |
| Hanover Park | 37,470 | 13 | 0 | |
| Calumet City | 37,000 | 14 | 2 | E. coli, Stage 2 DBP |
| Edwardsville | 36,608 | 36 | 4 | Disinfection Byproducts, TTHM |
| Marion | 36,042 | 173 | 14 | Contaminant 2920, Disinfection Byproducts, Stage 2 DBP |
| Machesney Park | 35,580 | 0 | 0 | |
| Darien | 35,146 | 26 | 3 | Disinfection Byproducts |
| Elk Grove Village | 34,701 | 4 | 0 | |
| Woodridge | 33,566 | 3 | 0 | |
| Glendale Heights | 33,176 | 6 | 0 | |
| Mundelein | 32,980 | 40 | 2 | Disinfection Byproducts, Stage 2 DBP |
| Burbank | 32,400 | 10 | 2 | Disinfection Byproducts, Stage 2 DBP |
| Geneva | 31,846 | 17 | 1 | Disinfection Byproducts |
| Galesburg | 31,805 | 5 | 1 | Disinfection Byproducts |
| Deerfield | 31,671 | 17 | 1 | Disinfection Byproducts |
| Collinsville | 31,000 | 24 | 2 | Disinfection Byproducts, Stage 2 DBP |
| Algonquin | 30,700 | 5 | 2 | Disinfection Byproducts |
| Centralia | 30,242 | 70 | 0 | |
| Gurnee | 30,193 | 11 | 0 | |
| Highland Park | 30,176 | 1 | 1 | Disinfection Byproducts |
| West Chicago | 29,742 | 13 | 0 | |
| Niles | 29,350 | 3 | 0 | |
| Mattoon | 29,120 | 11 | 2 | Disinfection Byproducts |
| Lansing | 29,076 | 14 | 0 | |
| Montgomery | 28,956 | 4 | 0 | |
| Glen Ellyn | 28,850 | 3 | 0 | |
| Lake in the Hills | 28,661 | 4 | 0 | |
| Huntley | 28,495 | 1 | 1 | E. coli |
| Franklin Park | 28,467 | 27 | 0 | |
| New Lenox | 28,434 | 11 | 0 | |
| Carbondale | 27,868 | 106 | 47 | Contaminant 2920, E. coli, Stage 2 DBP |
| Oak Forest | 27,478 | 11 | 0 | |
| Round Lake Beach | 27,200 | 11 | 0 | |
| Wilmette | 27,087 | 1 | 0 | |
| Charleston | 26,536 | 23 | 1 | Stage 2 DBP |
| Chicago Heights | 26,184 | 14 | 0 | |
| Batavia | 26,098 | 6 | 0 | |
| Lockport | 25,992 | 24 | 1 | Disinfection Byproducts |
| Belvidere | 25,780 | 10 | 0 | |
| Macomb | 25,773 | 243 | 27 | Disinfection Byproducts, E. coli, TTHM |
| Woodstock | 25,630 | 7 | 1 | Disinfection Byproducts |
| Morton Grove | 25,297 | 7 | 2 | Disinfection Byproducts |
| Westmont | 25,111 | 19 | 3 | Disinfection Byproducts |
| Elmwood Park | 25,000 | 3 | 1 | Disinfection Byproducts |
| Harvey | 25,000 | 7 | 0 | |
| Frankfort | 24,884 | 43 | 3 | Disinfection Byproducts, TTHM, Total Haloacetic Acids (HAA5) |
| Freeport | 24,558 | 58 | 5 | Disinfection Byproducts, Stage 2 DBP, Total Organic Carbon |
| Melrose Park | 24,516 | 193 | 2 | Disinfection Byproducts, E. coli |
| Zion | 24,443 | 8 | 0 | |
| Lisle | 24,233 | 4 | 0 | |
| Maywood | 24,090 | 22 | 1 | Disinfection Byproducts |
| Loves Park | 23,985 | 26 | 12 | Total Organic Carbon |
| Grayslake | 23,890 | 11 | 7 | Disinfection Byproducts |
| South Elgin | 23,648 | 11 | 1 | Disinfection Byproducts |
| Jacksonville | 23,634 | 34 | 24 | TTHM |
| Nashville | 23,493 | 39 | 11 | Barium, Contaminant 2920, Disinfection Byproducts +2 more |
| Rolling Meadows | 23,329 | 9 | 0 | |
| Yorkville | 23,233 | 104 | 21 | HAA5, Total Organic Carbon |
| Great Lakes | 23,000 | 1 | 0 | |
| Roselle | 22,897 | 13 | 0 | |
| East Moline | 22,614 | 33 | 2 | Disinfection Byproducts |
| Blue Island | 22,352 | 88 | 6 | Disinfection Byproducts, E. coli |
| Villa Park | 22,263 | 1 | 0 | |
| Crest Hill | 22,161 | 104 | 7 | Disinfection Byproducts, Stage 2 DBP |
| Bloomingdale | 22,018 | 2 | 0 | |
| South Holland | 22,000 | 23 | 8 | Disinfection Byproducts |
| Park Forest | 21,975 | 134 | 1 | E. coli |
| Dolton | 20,510 | 35 | 0 | |
| Evergreen Park | 19,943 | 1 | 0 | |
| Mokena | 19,887 | 11 | 0 | |
| Lake Zurich | 19,867 | 25 | 0 | |
| Lake Forest | 19,762 | 46 | 10 | Contaminant 2920, Disinfection Byproducts, Total Organic Carbon |
| Dixon | 19,500 | 87 | 1 | Stage 2 DBP |
| Homewood | 19,463 | 13 | 2 | Disinfection Byproducts |
| Ottawa | 19,288 | 470 | 61 | Disinfection Byproducts, Stage 2 DBP, Total Organic Carbon |
| Bellwood | 19,157 | 10 | 3 | Disinfection Byproducts, Stage 2 DBP |
| Alsip | 19,063 | 5 | 0 | |
| Brookfield | 18,777 | 6 | 0 | |
| Shorewood | 18,645 | 34 | 0 | |
| Bensenville | 18,537 | 8 | 0 | |
| Palos Hills | 18,530 | 2 | 0 | |
| Sycamore | 18,500 | 24 | 0 | |
| Justice | 18,457 | 5 | 0 | |
| Round Lake | 18,430 | 6 | 0 | |
| North Aurora | 18,350 | 1 | 0 | |
| Matteson | 18,293 | 30 | 0 | |
| Lemont | 18,030 | 25 | 10 | Total Organic Carbon |
| Hinsdale | 17,900 | 4 | 0 | |
| Cary | 17,826 | 6 | 1 | Disinfection Byproducts |
| Troy | 17,808 | 39 | 3 | Disinfection Byproducts, Stage 2 DBP |
| Morton | 17,329 | 52 | 0 | |
| Bethalto | 16,988 | 8 | 0 | |
| North Chicago | 16,813 | 21 | 9 | Endrin, TTHM |
| Canton | 16,748 | 17 | 0 | |
| Peru | 16,676 | 480 | 89 | Disinfection Byproducts, HAA5, Stage 2 DBP +1 more |
| Country Club Hills | 16,500 | 6 | 0 | |
| Bridgeview | 16,467 | 1 | 0 | |
| Chatham | 16,423 | 12 | 0 | |
| Westchester | 16,241 | 13 | 2 | Disinfection Byproducts |
| La Grange | 16,200 | 5 | 0 | |
| Mount Vernon | 15,793 | 17 | 0 | |
| Effingham | 15,604 | 2 | 0 | |
| Palos Heights | 15,500 | 2 | 0 | |
| Norridge | 15,251 | 1 | 0 | |
| Cahokia Heights | 15,250 | 0 | 0 | |
| Washington | 15,246 | 35 | 4 | Disinfection Byproducts |
| Murphysboro | 15,205 | 10 | 1 | Stage 2 DBP |
| Morris | 15,009 | 145 | 11 | Contaminant 4109, Disinfection Byproducts, Total Organic Carbon |
| Midlothian | 14,819 | 6 | 1 | Disinfection Byproducts |
| Robinson | 14,734 | 10 | 0 | |
| Hickory Hills | 14,505 | 0 | 0 | |
| Lindenhurst | 14,500 | 34 | 0 | |
| Forest Park | 14,340 | 3 | 0 | |
| Taylorville | 14,208 | 22 | 1 | Stage 2 DBP |
| Antioch | 14,199 | 40 | 4 | Barium, Disinfection Byproducts |
| Chicago Ridge | 14,130 | 2 | 0 | |
| Wauconda | 14,084 | 1 | 0 | |
| Wood Dale | 14,012 | 2 | 0 | |
| Channahon | 14,010 | 7 | 0 | |
| Caseyville | 13,798 | 12 | 3 | Disinfection Byproducts |
| Champaign | 13,680 | 3 | 0 | |
| Kewanee | 13,593 | 19 | 0 | |
| Rantoul | 13,574 | 111 | 35 | Barium |
| Lincolonwood | 13,463 | 4 | 1 | Disinfection Byproducts |
| Western Springs | 13,274 | 20 | 0 | |
| Jerseyville | 13,234 | 8 | 0 | |
| Hazel Crest | 13,098 | 7 | 1 | Disinfection Byproducts |
| Lagrange Park | 13,011 | 3 | 1 | Disinfection Byproducts |
| Glen Carbon | 12,957 | 14 | 0 | |
| North Lake | 12,840 | 7 | 0 | |
| Harrisburg | 12,829 | 29 | 4 | Barium, Stage 2 DBP |
| Minooka | 12,800 | 10 | 4 | Disinfection Byproducts, E. coli |
| Herrin | 12,747 | 7 | 0 | |
| Monmouth | 12,734 | 32 | 11 | Barium, Disinfection Byproducts, TTHM +1 more |
| Plano | 12,600 | 10 | 0 | |
| Metropolis | 12,599 | 7 | 3 | Barium |
| Highland | 12,581 | 50 | 1 | Stage 2 DBP |
| Benton | 12,568 | 84 | 2 | Disinfection Byproducts, Stage 2 DBP |
| Markham | 12,525 | 20 | 0 | |
| Richton Park | 12,504 | 193 | 2 | Disinfection Byproducts |
| Warrenville | 12,350 | 175 | 0 | |
| Ingleside | 12,194 | 19 | 2 | Disinfection Byproducts, Stage 2 DBP |
| Mahomet | 11,880 | 16 | 1 | Disinfection Byproducts |
| Volo | 11,779 | 116 | 8 | Cadmium, Disinfection Byproducts |
| River Forest | 11,717 | 4 | 1 | Disinfection Byproducts |
| Schiller Park | 11,709 | 8 | 3 | Disinfection Byproducts |
| Carlinville | 11,668 | 57 | 0 | |
| Sugar Grove | 11,243 | 12 | 0 | |
| Burr Ridge | 11,192 | 12 | 0 | |
| Columbia | 11,129 | 6 | 0 | |
| Salem | 11,125 | 16 | 0 | |
| Worth | 10,970 | 4 | 1 | Disinfection Byproducts |
| Summit | 10,875 | 14 | 0 | |
| Crestwood | 10,826 | 42 | 0 | |
| Barrington | 10,802 | 2 | 2 | Disinfection Byproducts, Stage 2 DBP |
| Rochelle | 10,670 | 209 | 19 | Disinfection Byproducts, Selenium, Total Organic Carbon |
| Wood River | 10,464 | 8 | 0 | |
| Oak Brook | 10,450 | 70 | 1 | Disinfection Byproducts |
| Pingree Grove | 10,365 | 35 | 2 | E. coli |
| Manhattan | 10,340 | 5 | 0 | |
| Lyons | 10,304 | 7 | 4 | Disinfection Byproducts |
| River Grove | 10,282 | 5 | 1 | Disinfection Byproducts |
| Riverdale | 10,266 | 6 | 3 | Disinfection Byproducts |
| Waterloo | 10,190 | 69 | 0 | |
| Maryville | 10,150 | 1 | 0 | |
| Pittsfield | 10,024 | 4 | 0 | |
| Fairfield | 10,013 | 60 | 26 | TTHM |
| Sauk Village | 9,921 | 556 | 0 | |
| Winfield | 9,835 | 2 | 0 | |
| Marshall | 9,748 | 11 | 0 | |
| Manteno | 9,700 | 14 | 3 | Disinfection Byproducts, Gross Alpha |
| La Salle | 9,700 | 23 | 11 | TTHM |
| Itasca | 9,506 | 5 | 0 | |
| Harvard | 9,469 | 2 | 1 | Disinfection Byproducts |
| Flossmoor | 9,371 | 8 | 0 | |
| Duquoin | 9,366 | 15 | 1 | Stage 2 DBP |
| Riverside | 9,298 | 9 | 4 | Disinfection Byproducts |
| Beach Park | 9,278 | 18 | 2 | Disinfection Byproducts |
| Lake Villa | 9,229 | 11 | 1 | Disinfection Byproducts |
| Lynwood | 9,149 | 10 | 0 | |
| Mascoutah | 9,144 | 1 | 0 | |
| Hamilton | 9,123 | 15 | 1 | Disinfection Byproducts |
| Vandalia | 9,117 | 51 | 4 | Disinfection Byproducts, Total Haloacetic Acids (HAA5) |
| West Frankfort | 9,110 | 5 | 0 | |
| Paris | 9,100 | 2 | 0 | |
| Hardwood Heights | 9,065 | 7 | 1 | Disinfection Byproducts |
| Willowbrook | 9,000 | 21 | 0 | |
| Glenwood | 8,956 | 16 | 0 | |
| Silvis | 8,923 | 297 | 10 | Disinfection Byproducts, Stage 2 DBP |
| Olney | 8,877 | 7 | 0 | |
| Rock Falls | 8,852 | 28 | 0 | |
| Glencoe | 8,849 | 0 | 0 | |
| Clarendon Hills | 8,702 | 4 | 0 | |
| Crete | 8,675 | 8 | 1 | Disinfection Byproducts |
| Eldorado | 8,636 | 22 | 4 | Barium, Stage 2 DBP |
| Granite City | 8,578 | 22 | 0 | |
| Pinckneyville | 8,524 | 63 | 23 | E. coli, TTHM |
| Calumet Park | 8,442 | 15 | 1 | Disinfection Byproducts |
| Chester | 8,407 | 4 | 1 | Disinfection Byproducts |
| Gilberts | 8,366 | 3 | 0 | |
| Greenville | 8,310 | 8 | 0 | |
| Hillside | 8,200 | 3 | 0 | |
| Arthur | 8,188 | 33 | 1 | Disinfection Byproducts |
| Geneseo | 8,075 | 256 | 128 | Barium, Disinfection Byproducts, Stage 2 DBP |
| Island Lake | 8,066 | 0 | 0 | |
| Princeton | 8,032 | 18 | 10 | Disinfection Byproducts, Stage 2 DBP, Surface Water Treatment |
| Lincolnshire | 7,940 | 2 | 1 | Disinfection Byproducts |
| Alton | 7,940 | 7 | 0 | |
| Park City | 7,885 | 40 | 0 | |
| Broadview | 7,848 | 12 | 3 | Disinfection Byproducts |
| West Dundee | 7,845 | 14 | 2 | Disinfection Byproducts |
| Clinton | 7,777 | 25 | 2 | Disinfection Byproducts |
| Rockton | 7,765 | 25 | 4 | Disinfection Byproducts, Stage 2 DBP, Total Organic Carbon |
| Hampshire | 7,758 | 14 | 4 | Total Organic Carbon |
| Palos Park | 7,673 | 18 | 1 | Stage 2 DBP |
| Marengo | 7,572 | 2 | 0 | |
| Clayton | 7,567 | 13 | 1 | Disinfection Byproducts |
| Sullivan | 7,329 | 11 | 2 | TTHM |
| Galena | 7,328 | 44 | 6 | Disinfection Byproducts, Stage 2 DBP, Total Organic Carbon |
| Flora | 7,248 | 8 | 0 | |
| Sandwich | 7,248 | 19 | 2 | Selenium |
| Hillsboro | 7,120 | 22 | 6 | Total Haloacetic Acids (HAA5) |
| Carmi | 7,107 | 2 | 0 | |
| North Riverside | 7,071 | 7 | 4 | Disinfection Byproducts |
| Lagrange | 7,040 | 9 | 0 | |
| Mt Carmel | 7,015 | 19 | 1 | Contaminant 2920 |
| Freeburg | 6,941 | 39 | 4 | Disinfection Byproducts, E. coli |
| Mendota | 6,926 | 11 | 6 | Total Haloacetic Acids (HAA5) |
| Stickney | 6,902 | 40 | 1 | Disinfection Byproducts |
| Pittsburg | 6,875 | 15 | 0 | |
| Aviston | 6,854 | 106 | 8 | Disinfection Byproducts, Stage 2 DBP, Total Haloacetic Acids (HAA5) |
| Scott Air Force Base | 6,779 | 0 | 0 | |
| Mcleansboro | 6,770 | 43 | 1 | Stage 2 DBP |
| Carterville | 6,737 | 27 | 0 | |
| Litchfield | 6,648 | 159 | 0 | |
| Pocahontas | 6,645 | 8 | 0 | |
| Elburn | 6,629 | 3 | 0 | |
| Winthrop Harbor | 6,565 | 66 | 0 | |
| Winchester | 6,540 | 50 | 15 | Disinfection Byproducts, TTHM |
| Milan | 6,507 | 76 | 12 | Disinfection Byproducts |
| Wilmington | 6,492 | 68 | 2 | Disinfection Byproducts |
| Carrollton | 6,466 | 16 | 0 | |
| Beecher | 6,421 | 15 | 0 | |
| Countryside | 6,420 | 2 | 0 | |
| Brownstown | 6,348 | 41 | 13 | Disinfection Byproducts, TTHM |
| Chillicothe | 6,292 | 73 | 2 | Disinfection Byproducts |
| Carlyle | 6,238 | 45 | 5 | Disinfection Byproducts |
| Trenton | 6,212 | 26 | 16 | Disinfection Byproducts, TTHM |
| Williamsville | 6,198 | 4 | 0 | |
| Braidwood | 6,194 | 18 | 0 | |
| Shelbyville | 6,174 | 2 | 0 | |
| Beardstown | 5,951 | 5 | 0 | |
| Peoria Heights | 5,908 | 23 | 0 | |
| Coal City | 5,856 | 171 | 20 | Contaminant 4109, Stage 2 DBP, Total Organic Carbon |
| Mount Zion | 5,833 | 28 | 22 | Disinfection Byproducts, TTHM |
| Wonder Lake | 5,820 | 33 | 3 | Disinfection Byproducts |
| Swansea | 5,820 | 41 | 5 | Disinfection Byproducts, E. coli |
| Lake Bluff | 5,817 | 21 | 3 | Disinfection Byproducts |
| Peoria | 5,806 | 9 | 2 | Stage 2 DBP |
| Hoopeston | 5,802 | 1 | 1 | Disinfection Byproducts |
| Pana | 5,800 | 73 | 0 | |
| East Alton | 5,786 | 3 | 0 | |
| Staunton | 5,756 | 50 | 3 | Contaminant 2920, Disinfection Byproducts |
| Monticello | 5,641 | 0 | 0 | |
| Spring Valley | 5,582 | 0 | 0 | |
| Watseka | 5,555 | 15 | 4 | Disinfection Byproducts |
| Poplar Grove | 5,549 | 46 | 0 | |
| Marseilles | 5,489 | 35 | 7 | Disinfection Byproducts, Stage 2 DBP |
| Odin | 5,488 | 24 | 0 | |
| Mt Vernon | 5,483 | 3 | 0 | |
| Petersburg | 5,478 | 32 | 9 | TTHM |
| Northfield | 5,470 | 3 | 1 | Disinfection Byproducts |
| Robbins | 5,415 | 77 | 0 | |
| Highwood | 5,335 | 4 | 0 | |
| Posen | 5,331 | 11 | 2 | Disinfection Byproducts |
| Genoa | 5,298 | 11 | 0 | |
| Albion | 5,219 | 4 | 0 | |
| Eureka | 5,216 | 5 | 1 | Disinfection Byproducts |
| Berkeley | 5,214 | 3 | 1 | Disinfection Byproducts |
| Anna | 5,210 | 31 | 19 | Stage 2 DBP, TTHM |
| Monee | 5,148 | 29 | 0 | |
| Mt. Sterling | 5,076 | 5 | 0 | |
| Brighton | 5,041 | 13 | 0 | |
| Farmington Hills | 5,012 | 140 | 15 | Disinfection Byproducts, TTHM, Total Haloacetic Acids (HAA5) |
| Georgetown | 4,950 | 26 | 0 | |
| Creve Coeur | 4,934 | 2 | 0 | |
| Tuscola | 4,925 | 14 | 0 | |
| Olympia Fields | 4,922 | 23 | 0 | |
| Fox River Grove | 4,918 | 31 | 2 | Disinfection Byproducts |
| Valmeyer | 4,913 | 15 | 1 | Stage 2 DBP |
| Round Lake Park | 4,900 | 14 | 1 | Stage 2 DBP |
| Breese | 4,772 | 21 | 0 | |
| Westville | 4,761 | 47 | 13 | Barium, Disinfection Byproducts, Stage 2 DBP |
| Wayne City | 4,755 | 18 | 0 | |
| Byron | 4,743 | 246 | 0 | |
| Cherry Valley | 4,731 | 9 | 6 | Total Organic Carbon |
| Coal Valley | 4,725 | 52 | 5 | Contaminant 1041, Disinfection Byproducts |
| Lebanon | 4,714 | 1 | 0 | |
| Dupo | 4,684 | 3 | 0 | |
| Hardin | 4,675 | 4 | 2 | TTHM |
| Dwight | 4,673 | 37 | 6 | Barium, Disinfection Byproducts |
| Virden | 4,592 | 5 | 2 | Disinfection Byproducts |
| Athens | 4,575 | 60 | 0 | |
| Auburn | 4,574 | 6 | 0 | |
| Paxton | 4,555 | 2 | 0 | |
| Sublette | 4,526 | 15 | 2 | Disinfection Byproducts, Total Organic Carbon |
| Lawrenceville | 4,524 | 16 | 1 | Disinfection Byproducts |
| Makanda | 4,501 | 14 | 9 | Contaminant 2920, E. coli |
| Oglesby | 4,500 | 5 | 1 | Disinfection Byproducts |
| Metamora | 4,488 | 33 | 3 | Disinfection Byproducts |
| Sparta | 4,395 | 40 | 15 | Contaminant 2920, Stage 2 DBP, Total Haloacetic Acids (HAA5) |
| Forsyth | 4,382 | 12 | 2 | Disinfection Byproducts |
| Riverton | 4,279 | 34 | 0 | |
| Cortland | 4,270 | 7 | 0 | |
| Lakewood | 4,267 | 111 | 0 | |
| Morrison | 4,263 | 14 | 1 | Disinfection Byproducts |
| Hometown | 4,240 | 5 | 0 | |
| New Baden | 4,178 | 1 | 0 | |
| Vernon Hills | 4,164 | 32 | 2 | Disinfection Byproducts |
| Gillespie | 4,048 | 106 | 1 | Stage 2 DBP |
| Newton | 4,018 | 55 | 1 | Disinfection Byproducts |
| Smithton | 4,006 | 3 | 0 | |
| Wasco | 4,000 | 8 | 0 | |
| Rochester | 3,990 | 19 | 0 | |
| Burnham | 3,989 | 25 | 1 | Disinfection Byproducts |
| Rosemont | 3,952 | 3 | 0 | |
| South Chicago Heights | 3,924 | 3 | 1 | Disinfection Byproducts |
| Bushnell | 3,892 | 6 | 0 | |
| Bridgeport | 3,847 | 29 | 2 | Disinfection Byproducts |
| Red Bud | 3,804 | 24 | 6 | Disinfection Byproducts |
| Phoenix | 3,669 | 96 | 6 | Disinfection Byproducts |
| Fairbury | 3,633 | 1 | 1 | Stage 2 DBP |
| Camp Point | 3,624 | 15 | 12 | Disinfection Byproducts |
| Woodlawn | 3,587 | 5 | 0 | |
| New Douglas | 3,575 | 16 | 0 | |
| Johnston City | 3,509 | 6 | 1 | Stage 2 DBP |
| South Jacksonville | 3,508 | 40 | 0 | |
| Gibson City | 3,500 | 2 | 0 | |
| Leroy | 3,498 | 43 | 17 | Disinfection Byproducts, Total Haloacetic Acids (HAA5) |
| Aledo | 3,470 | 6 | 0 | |
| Oregon | 3,449 | 19 | 1 | Stage 2 DBP |
| Mackinaw | 3,399 | 0 | 0 | |
| Knoxville | 3,370 | 46 | 6 | Total Organic Carbon |
| Norris City | 3,351 | 16 | 0 | |
| Fulton | 3,346 | 9 | 3 | Disinfection Byproducts, Stage 2 DBP |
| Casey | 3,274 | 26 | 8 | Disinfection Byproducts |
| Davis | 3,244 | 12 | 0 | |
| Indian Head Park | 3,240 | 11 | 0 | |
| Momence | 3,196 | 191 | 2 | Disinfection Byproducts, Stage 2 DBP |
| East Dundee | 3,115 | 0 | 0 | |
| Sleepy Hollow | 3,100 | 3 | 0 | |
| Moweaqua | 3,085 | 49 | 5 | Selenium, Stage 2 DBP |
| Christopher | 3,072 | 31 | 0 | |
| Savanna | 3,020 | 5 | 0 | |
| Lakemoor | 3,013 | 15 | 0 | |
| Winnebago | 3,000 | 0 | 0 | |
| Marquette Heights | 2,974 | 11 | 0 | |
| Dixmoor | 2,973 | 25 | 3 | Disinfection Byproducts |
| Havana | 2,963 | 7 | 0 | |
| Menard | 2,950 | 67 | 0 | |
| Arcola | 2,927 | 30 | 8 | Disinfection Byproducts |
| Rushville | 2,923 | 15 | 0 | |
| Cuba | 2,902 | 42 | 1 | Disinfection Byproducts |
| Crofton | 2,894 | 58 | 4 | TTHM |
| Mt. Morris | 2,861 | 1 | 0 | |
| Mulkeytown | 2,858 | 7 | 0 | |
| Thompsonville | 2,854 | 12 | 0 | |
| Heyworth | 2,853 | 1 | 0 | |
| Tamms | 2,838 | 29 | 0 | |
| Denver | 2,831 | 175 | 104 | Contaminant 4109, Total Organic Carbon |
| El Paso | 2,812 | 2 | 0 | |
| Astoria | 2,805 | 11 | 0 | |
| Lake Barrington | 2,800 | 6 | 3 | Disinfection Byproducts, Stage 2 DBP |
| Pawnee | 2,739 | 3 | 1 | Disinfection Byproducts |
| New Burnside | 2,702 | 7 | 7 | Contaminant 2920 |
| Altamont | 2,686 | 12 | 10 | Disinfection Byproducts, E. coli |
| Lena | 2,680 | 1 | 0 | |
| Glasford | 2,665 | 5 | 1 | Stage 2 DBP |
| Round Lake Heights | 2,622 | 3 | 0 | |
| Lincoln | 2,601 | 130 | 5 | Disinfection Byproducts |
| Mason City | 2,558 | 1 | 0 | |
| Galva | 2,529 | 6 | 0 | |
| Kenilworth | 2,514 | 3 | 0 | |
| Carthage | 2,510 | 75 | 2 | Toxaphene |
| Diamond | 2,508 | 6 | 0 | |
| Sesser | 2,505 | 7 | 0 | |
| Amboy | 2,500 | 1 | 0 | |
| Tremont | 2,414 | 4 | 0 | |
| Lewistown | 2,400 | 5 | 2 | Contaminant 1032 |
| Whittington | 2,393 | 28 | 0 | |
| Prospect Heights | 2,380 | 9 | 1 | Disinfection Byproducts |
| Catlin | 2,380 | 5 | 0 | |
| Dawson | 2,375 | 35 | 0 | |
| Nokomis | 2,370 | 2 | 0 | |
| Buncombe | 2,365 | 22 | 22 | Contaminant 2920, TTHM |
| Polo | 2,355 | 10 | 1 | Disinfection Byproducts |
| Seneca | 2,353 | 4 | 0 | |
| Davis Junction | 2,344 | 0 | 0 | |
| Thornton | 2,333 | 7 | 0 | |
| Oblong | 2,321 | 4 | 0 | |
| White Hall | 2,313 | 32 | 1 | Stage 2 DBP |
| Modesto | 2,291 | 81 | 43 | Contaminant 2920, Disinfection Byproducts, E. coli |
| East Dubuque | 2,236 | 7 | 0 | |
| Henry | 2,230 | 2 | 0 | |
| Elwood | 2,229 | 10 | 1 | Disinfection Byproducts |
| Desoto | 2,195 | 13 | 0 | |
| Pecatonica | 2,195 | 1 | 1 | Disinfection Byproducts |
| Groveland | 2,185 | 0 | 0 | |
| Roodhouse | 2,180 | 50 | 9 | Selenium, TTHM |
| Pontiac | 2,173 | 67 | 0 | |
| Thomson | 2,166 | 0 | 0 | |
| Ava | 2,161 | 18 | 0 | |
| Belle Rive | 2,143 | 3 | 0 | |
| Carbon Cliff | 2,134 | 24 | 6 | Total Organic Carbon |
| Orion | 2,129 | 23 | 1 | Stage 2 DBP |
| Vienna | 2,119 | 23 | 5 | Contaminant 2920, Disinfection Byproducts |
| Prophetstown | 2,100 | 3 | 1 | Stage 2 DBP |
| Richmond | 2,087 | 8 | 0 | |
| Lexington | 2,087 | 27 | 12 | TTHM, Total Haloacetic Acids (HAA5) |
| Cambridge | 2,086 | 10 | 8 | Total Organic Carbon |
| Carrier Mills | 2,085 | 13 | 0 | |
| Elmwood | 2,058 | 3 | 0 | |
| Farmer City | 2,055 | 5 | 1 | Disinfection Byproducts |
| Port Byron | 2,028 | 23 | 4 | Contaminant 1032, Disinfection Byproducts |
| Rockdale | 2,012 | 32 | 0 | |
| Hinckley | 2,006 | 16 | 14 | Total Organic Carbon |
| Kirkland | 2,000 | 2 | 1 | Disinfection Byproducts |
| Roanoke | 2,000 | 1 | 0 | |
| Hopkins Park | 1,989 | 90 | 0 | |
| Dix | 1,972 | 4 | 0 | |
| New Athens | 1,970 | 37 | 5 | E. coli |
| Merrionette Park | 1,969 | 18 | 0 | |
| Delavan | 1,958 | 15 | 1 | Disinfection Byproducts |
| Somonauk | 1,936 | 3 | 2 | Disinfection Byproducts |
| Steeleville | 1,930 | 206 | 11 | Total Organic Carbon |
| Minonk | 1,928 | 2 | 0 | |
| Chenoa | 1,925 | 80 | 34 | Disinfection Byproducts, TTHM, Total Haloacetic Acids (HAA5) |
| Mt. Vernon | 1,901 | 12 | 0 | |
| Princeville | 1,901 | 0 | 0 | |
| South Roxana | 1,891 | 28 | 0 | |
| Girard | 1,885 | 8 | 2 | Disinfection Byproducts |
| Pierron | 1,882 | 14 | 4 | Total Haloacetic Acids (HAA5) |
| Bluford | 1,880 | 6 | 0 | |
| Lacon | 1,878 | 0 | 0 | |
| Lancaster | 1,877 | 2 | 0 | |
| Pekin | 1,875 | 39 | 1 | Stage 2 DBP |
| Gardner | 1,865 | 11 | 2 | Disinfection Byproducts |
| Hampton | 1,863 | 18 | 1 | Total Haloacetic Acids (HAA5) |
| East Carondelet | 1,863 | 13 | 0 | |
| Hudson | 1,847 | 16 | 0 | |
| Depue | 1,838 | 5 | 0 | |
| St. Jacob | 1,835 | 13 | 2 | Stage 2 DBP, TTHM |
| Jonesboro | 1,825 | 11 | 5 | TTHM |
| Ford Heights | 1,813 | 26 | 4 | Disinfection Byproducts |
| Stonington | 1,800 | 0 | 0 | |
| Gilman | 1,793 | 12 | 1 | Disinfection Byproducts |
| Milford | 1,781 | 33 | 3 | Disinfection Byproducts |
| Zeigler | 1,774 | 15 | 0 | |
| Olive Branch | 1,763 | 16 | 0 | |
| Bunker Hill | 1,760 | 4 | 0 | |
| Sherrard | 1,747 | 38 | 1 | Disinfection Byproducts |
| Stockton | 1,728 | 6 | 0 | |
| Cambria | 1,727 | 6 | 0 | |
| Teutopolis | 1,719 | 13 | 0 | |
| Crainville | 1,711 | 24 | 0 | |
| Maroa | 1,700 | 1 | 0 | |
| Atlanta | 1,692 | 21 | 8 | Barium, Contaminant 1041, Disinfection Byproducts |
| St Rose | 1,688 | 52 | 4 | Stage 2 DBP, Total Haloacetic Acids (HAA5) |
| Sheridan | 1,670 | 10 | 0 | |
| Bement | 1,661 | 8 | 1 | Disinfection Byproducts |
| Annapolis | 1,655 | 9 | 1 | Stage 2 DBP |
| Neoga | 1,636 | 9 | 4 | E. coli, TTHM |
| Earlville | 1,613 | 0 | 0 | |
| Grayville | 1,613 | 31 | 0 | |
| Benld | 1,612 | 8 | 0 | |
| Warsaw | 1,607 | 10 | 0 | |
| Dunlap | 1,603 | 1 | 0 | |
| Herscher | 1,600 | 1 | 0 | |
| Erie | 1,600 | 11 | 2 | Disinfection Byproducts |
| Hurst | 1,589 | 34 | 9 | Contaminant 2920, Stage 2 DBP |
| Barry | 1,582 | 9 | 1 | Disinfection Byproducts |
| Kincaid | 1,561 | 3 | 0 | |
| Mt Carroll | 1,559 | 9 | 1 | Stage 2 DBP |
| Manito | 1,552 | 18 | 0 | |
| Germantown | 1,537 | 26 | 0 | |
| Palmyra | 1,533 | 58 | 33 | Contaminant 2920, Disinfection Byproducts, E. coli |
| Sandoval | 1,529 | 4 | 0 | |
| Okawville | 1,521 | 2 | 2 | E. coli |
| Virginia | 1,514 | 3 | 0 | |
| Greenup | 1,513 | 6 | 0 | |
| Roxana | 1,509 | 4 | 0 | |
| Pleasant Plains | 1,508 | 10 | 0 | |
| Waterman | 1,506 | 10 | 0 | |
| Lanark | 1,504 | 18 | 0 | |
| East Hazel Crest | 1,500 | 6 | 2 | Disinfection Byproducts |
| Clifton | 1,500 | 5 | 1 | Disinfection Byproducts |
| Arenzville | 1,497 | 15 | 0 | |
| Maple Park | 1,484 | 30 | 2 | Contaminant 4109, Total Organic Carbon |
| Greenfield | 1,480 | 80 | 40 | Contaminant 2920, Total Haloacetic Acids (HAA5) |
| North Pekin | 1,478 | 1 | 0 | |
| Bethany | 1,475 | 5 | 1 | Disinfection Byproducts |
| Hodgkins | 1,472 | 7 | 0 | |
| Garden Homes | 1,472 | 10 | 0 | |
| Green Oaks | 1,470 | 7 | 2 | Disinfection Byproducts, Stage 2 DBP |
| Provo | 1,468 | 43 | 0 | |
| Oakwood | 1,467 | 8 | 0 | |
| Oakbrook Terrace | 1,440 | 2 | 0 | |
| Macon | 1,437 | 9 | 1 | Disinfection Byproducts |
| Cerro Gordo | 1,433 | 2 | 0 | |
| Durand | 1,427 | 28 | 4 | Disinfection Byproducts |
| Vergennes | 1,411 | 58 | 0 | |
| Gridley | 1,411 | 2 | 1 | Disinfection Byproducts |
| Onarga | 1,409 | 14 | 1 | Disinfection Byproducts |
| Murrayville | 1,403 | 11 | 0 | |
| Utica | 1,400 | 60 | 5 | Contaminant 1028, Disinfection Byproducts |
| Colchester | 1,395 | 1 | 0 | |
| Malta | 1,393 | 228 | 1 | Stage 2 DBP |
| Payson | 1,386 | 4 | 2 | Disinfection Byproducts |
| Danvers | 1,383 | 52 | 46 | Barium, Contaminant 1041, Disinfection Byproducts |
| New Berlin | 1,380 | 38 | 2 | Disinfection Byproducts |
| Hebron | 1,368 | 4 | 2 | Disinfection Byproducts |
| Granville | 1,359 | 167 | 0 | |
| Atwood | 1,353 | 26 | 3 | Disinfection Byproducts |
| Toluca | 1,348 | 2 | 0 | |
| Capron | 1,343 | 49 | 1 | Disinfection Byproducts |
| Forreston | 1,338 | 0 | 0 | |
| Ashland | 1,333 | 16 | 0 | |
| Rossville | 1,331 | 8 | 0 | |
| Warren | 1,323 | 9 | 0 | |
| Assumption | 1,315 | 34 | 10 | Selenium, Stage 2 DBP, TTHM |
| Walnut | 1,311 | 16 | 2 | Disinfection Byproducts |
| Wyoming | 1,300 | 13 | 0 | |
| Johnsburg | 1,298 | 39 | 3 | Disinfection Byproducts |
| Kingston | 1,280 | 41 | 5 | Disinfection Byproducts, Stage 2 DBP |
| Toledo | 1,278 | 0 | 0 | |
| St Elmo | 1,272 | 0 | 0 | |
| Cobden | 1,267 | 2 | 0 | |
| Ladd | 1,263 | 4 | 0 | |
| Hartford | 1,260 | 16 | 0 | |
| Griggsville | 1,259 | 13 | 0 | |
| Chatsworth | 1,256 | 5 | 0 | |
| Hanna City | 1,253 | 0 | 0 | |
| Downs | 1,251 | 51 | 6 | Contaminant 1028, Disinfection Byproducts, E. coli |
| Shawneetown | 1,249 | 9 | 0 | |
| Albers | 1,231 | 22 | 2 | Disinfection Byproducts |
| Warrensburg | 1,230 | 7 | 1 | Stage 2 DBP |
| Forrest | 1,225 | 1 | 0 | |
| Mt. Olive | 1,218 | 2 | 0 | |
| St Anne | 1,213 | 53 | 1 | Disinfection Byproducts |
| Louisville | 1,201 | 10 | 1 | Gross Alpha |
| Homer | 1,200 | 7 | 1 | Total Haloacetic Acids (HAA5) |
| Martinsville | 1,200 | 4 | 0 | |
| Chrisman | 1,200 | 73 | 26 | Barium, Contaminant 1041, Disinfection Byproducts |
| La Harpe | 1,200 | 40 | 10 | Disinfection Byproducts, E. coli, Stage 2 DBP +1 more |
| Nauvoo | 1,200 | 19 | 1 | Disinfection Byproducts |
| Stillman Valley | 1,200 | 0 | 0 | |
| Windsor | 1,200 | 17 | 5 | Disinfection Byproducts |
| Sumner | 1,195 | 4 | 0 | |
| Waverly | 1,194 | 4 | 0 | |
| Toulon | 1,193 | 11 | 3 | Disinfection Byproducts, Stage 2 DBP |
| Dowell | 1,188 | 7 | 0 | |
| Valier | 1,182 | 11 | 0 | |
| Minier | 1,180 | 0 | 0 | |
| Divernon | 1,172 | 1 | 0 | |
| Buffalo | 1,170 | 54 | 0 | |
| Loda | 1,145 | 10 | 0 | |
| Gorham | 1,143 | 3 | 0 | |
| Brimfield | 1,137 | 7 | 0 | |
| Mounds | 1,135 | 53 | 0 | |
| Ridge Farm | 1,133 | 29 | 2 | Disinfection Byproducts |
| Oquawka | 1,125 | 10 | 0 | |
| Royalton | 1,118 | 21 | 0 | |
| Nebo | 1,116 | 106 | 3 | Disinfection Byproducts, Stage 2 DBP |
| Percy | 1,111 | 20 | 0 | |
| Flanagan | 1,110 | 8 | 0 | |
| Worden | 1,096 | 3 | 2 | Disinfection Byproducts |
| Chebanse | 1,094 | 9 | 0 | |
| Crossville | 1,091 | 0 | 0 | |
| Hamel | 1,087 | 28 | 0 | |
| Meredosia | 1,075 | 5 | 0 | |
| Cave-in-Rock | 1,071 | 5 | 0 | |
| Edinburg | 1,068 | 45 | 21 | Stage 2 DBP, TTHM |
| Morrisonville | 1,068 | 4 | 1 | Disinfection Byproducts |
| Elkville | 1,068 | 11 | 1 | Disinfection Byproducts |
| Goreville | 1,068 | 18 | 8 | Contaminant 2920 |
| Thomasboro | 1,066 | 24 | 0 | |
| Enfield | 1,064 | 6 | 0 | |
| Patoka | 1,055 | 7 | 1 | E. coli |
| Clearwater | 1,054 | 27 | 0 | |
| Coulterville | 1,052 | 11 | 0 | |
| Marine | 1,037 | 6 | 0 | |
| Illiopolis | 1,037 | 38 | 16 | TTHM |
| Oakland | 1,035 | 45 | 2 | Disinfection Byproducts |
| Washburn | 1,032 | 9 | 0 | |
| Hennepin | 1,016 | 5 | 0 | |
| Alto Pass | 1,015 | 5 | 0 | |
| Odell | 1,014 | 0 | 0 | |
| Bannockburn | 1,013 | 3 | 2 | Disinfection Byproducts |
| Pleasant Hill | 1,004 | 33 | 0 | |
| Orem | 1,001 | 2 | 0 | |
| Littleton | 1,000 | 9 | 2 | Disinfection Byproducts |
| South Pekin | 996 | 9 | 0 | |
| Mazon | 994 | 19 | 0 | |
| Milledgeville | 989 | 0 | 0 | |
| Colfax | 989 | 19 | 5 | Disinfection Byproducts |
| Galatia | 989 | 43 | 0 | |
| Newark | 986 | 1 | 1 | Disinfection Byproducts |
| Energy | 984 | 0 | 0 | |
| Wenona | 974 | 22 | 7 | Disinfection Byproducts, Total Organic Carbon |
| Raymond | 974 | 3 | 0 | |
| Viola | 970 | 25 | 0 | |
| Ashton | 967 | 24 | 0 | |
| Ramsey | 966 | 25 | 6 | Total Haloacetic Acids (HAA5) |
| Wataga | 965 | 13 | 1 | Stage 2 DBP |
| Rapids City | 962 | 6 | 0 | |
| Clay City | 957 | 12 | 0 | |
| Mendon | 953 | 0 | 0 | |
| Leland | 951 | 12 | 0 | |
| Stronghurst | 950 | 103 | 0 | |
| Sheldon | 950 | 14 | 0 | |
| Kinmundy | 940 | 6 | 0 | |
| Mansfield | 939 | 13 | 0 | |
| Goodfield | 936 | 4 | 4 | Disinfection Byproducts, Total Haloacetic Acids (HAA5) |
| Lawrencville | 920 | 20 | 1 | Disinfection Byproducts |
| Roseville | 915 | 7 | 2 | E. coli |
| Beckemeyer | 913 | 0 | 0 | |
| Gifford | 911 | 5 | 0 | |
| Mcclure | 910 | 16 | 0 | |
| Argenta | 900 | 17 | 0 | |
| Bismarck | 900 | 8 | 0 | |
| Cedaredge | 898 | 105 | 3 | Surface Water Treatment |
| Franklin Grove | 896 | 18 | 0 | |
| Wyanet | 886 | 3 | 2 | Disinfection Byproducts, Stage 2 DBP |
| Shabbona | 881 | 71 | 0 | |
| Piper City | 875 | 3 | 0 | |
| Ridgway | 874 | 10 | 1 | Disinfection Byproducts |
| Paw Paw | 870 | 4 | 0 | |
| Tallula | 868 | 4 | 0 | |
| Hanover | 863 | 0 | 0 | |
| East Galesburg | 860 | 7 | 0 | |
| Green Valley | 860 | 12 | 1 | Stage 2 DBP |
| Dahlgren | 859 | 5 | 0 | |
| St David | 850 | 25 | 2 | Disinfection Byproducts |
| Cissna Park | 846 | 11 | 0 | |
| Albany | 846 | 82 | 1 | Disinfection Byproducts |
| Logan | 845 | 5 | 0 | |
| Chandlerville | 838 | 9 | 1 | Stage 2 DBP |
| Newman | 836 | 53 | 0 | |
| Alexis | 836 | 22 | 1 | Disinfection Byproducts |
| Paloma | 833 | 20 | 3 | Disinfection Byproducts |
| Hopedale | 830 | 2 | 0 | |
| Yates City | 828 | 1 | 0 | |
| Bloomfield Hills | 821 | 2 | 0 | |
| West Salem | 819 | 4 | 0 | |
| Loami | 812 | 2 | 0 | |
| Techny | 809 | 2 | 1 | Disinfection Byproducts |
| Noble | 805 | 7 | 4 | TTHM |
| Elizabeth | 802 | 6 | 0 | |
| Shannon | 801 | 64 | 52 | HAA5, Total Organic Carbon |
| New Memphis | 800 | 1 | 1 | Disinfection Byproducts |
| Forest View | 800 | 1 | 0 | |
| Braceville | 800 | 110 | 3 | Disinfection Byproducts, Stage 2 DBP |
| Franklin | 800 | 5 | 3 | TTHM |
| Willisville | 799 | 27 | 0 | |
| Ursa | 794 | 19 | 9 | Selenium |
| Long Grove | 791 | 21 | 0 | |
| Mc Lean | 791 | 14 | 0 | |
| Pearl City | 790 | 244 | 0 | |
| Dallas City | 788 | 1 | 0 | |
| Farmersville | 784 | 9 | 0 | |
| Orangeville | 780 | 0 | 0 | |
| Greenview | 778 | 4 | 0 | |
| Coello | 772 | 5 | 0 | |
| Woodhull | 771 | 0 | 0 | |
| Prairie Du Rocher | 759 | 4 | 1 | Stage 2 DBP |
| Alhambra | 755 | 7 | 0 | |
| San Jose | 754 | 6 | 0 | |
| Dongola | 752 | 12 | 0 | |
| La Moille | 750 | 9 | 0 | |
| Ogden | 750 | 1 | 0 | |
| Camargo | 750 | 17 | 12 | Disinfection Byproducts, TTHM |
| Findlay | 750 | 27 | 3 | Disinfection Byproducts, Stage 2 DBP |
| Bluffs | 748 | 0 | 0 | |
| Keithsburg | 747 | 5 | 0 | |
| Stewardson | 747 | 7 | 0 | |
| Tiskilwa | 740 | 11 | 2 | Disinfection Byproducts, Stage 2 DBP |
| New Windsor | 740 | 20 | 3 | E. coli, Stage 2 DBP |
| Tilden | 740 | 7 | 2 | E. coli |
| Vermont | 738 | 55 | 38 | TTHM, Total Haloacetic Acids (HAA5) |
| Wolf Lake | 738 | 9 | 8 | TTHM |
| Alpha | 736 | 36 | 7 | Disinfection Byproducts, Stage 2 DBP |
| Brookport | 730 | 7 | 1 | Stage 2 DBP |
| Sandy | 727 | 2 | 0 | |
| Ashkum | 724 | 15 | 1 | Disinfection Byproducts |
| Taylor Springs | 724 | 5 | 0 | |
| Moro | 723 | 35 | 0 | |
| Thayer | 721 | 20 | 0 | |
| Taylor Ridge | 719 | 15 | 2 | Disinfection Byproducts |
| Kirkwood | 714 | 13 | 2 | Disinfection Byproducts |
| Speld | 710 | 0 | 0 | |
| Kansas | 707 | 16 | 1 | Disinfection Byproducts |
| Tonica | 705 | 4 | 0 | |
| South Wilmington | 700 | 53 | 0 | |
| Evansville | 700 | 21 | 6 | Bromate, Disinfection Byproducts, E. coli |
| Oneida | 696 | 3 | 0 | |
| Towanda | 690 | 18 | 0 | |
| Fairmount | 690 | 2 | 0 | |
| Tampico | 689 | 3 | 1 | Stage 2 DBP |
| White Heath | 685 | 7 | 0 | |
| Potomac | 685 | 19 | 1 | Stage 2 DBP |
| Creal Springs | 683 | 15 | 8 | Contaminant 2920, Stage 2 DBP |
| Saybrook | 679 | 6 | 0 | |
| Westfield | 678 | 51 | 4 | Disinfection Byproducts |
| Bradford | 676 | 0 | 0 | |
| West City | 664 | 15 | 0 | |
| Danforth | 663 | 13 | 4 | Stage 2 DBP, TTHM |
| Cedarville | 663 | 7 | 2 | Disinfection Byproducts |
| Chapin | 658 | 11 | 1 | Disinfection Byproducts |
| Shipman | 656 | 7 | 1 | Disinfection Byproducts |
| Equality | 652 | 6 | 0 | |
| Matherville | 651 | 3 | 0 | |
| Crescent City | 650 | 1 | 0 | |
| Deer Creek | 647 | 9 | 0 | |
| Cordova | 640 | 25 | 1 | Stage 2 DBP |
| Ashmore | 637 | 37 | 0 | |
| Bartelso | 635 | 6 | 0 | |
| Cisne | 634 | 0 | 0 | |
| Golconda | 630 | 11 | 6 | Barium, TTHM |
| Creston | 627 | 9 | 0 | |
| Keyesport | 625 | 21 | 0 | |
| Golden | 620 | 0 | 0 | |
| Hutsonville | 613 | 1 | 0 | |
| New Boston | 613 | 5 | 0 | |
| Cowden | 612 | 4 | 0 | |
| Liberty | 609 | 5 | 1 | Disinfection Byproducts |
| Raleigh | 605 | 3 | 0 | |
| Damiansville | 602 | 21 | 3 | Disinfection Byproducts, Stage 2 DBP |
| Bedford Park | 602 | 0 | 0 | |
| Buckley | 600 | 5 | 0 | |
| Stanford | 600 | 1 | 0 | |
| Union | 594 | 12 | 0 | |
| St. Francisville | 583 | 31 | 0 | |
| Sawyerville | 578 | 17 | 1 | Stage 2 DBP |
| Williamsfield | 575 | 5 | 1 | Stage 2 DBP |
| Blandinsville | 569 | 0 | 0 | |
| Godley | 566 | 141 | 0 | |
| Andover | 565 | 2 | 0 | |
| Elkhart | 565 | 11 | 1 | Stage 2 DBP |
| Ashley | 565 | 5 | 0 | |
| Cullom | 563 | 14 | 1 | Disinfection Byproducts |
| East St. Louis | 563 | 0 | 0 | |
| Carlock | 562 | 45 | 42 | Barium |
| Dorchester | 562 | 8 | 0 | |
| Grand Tower | 559 | 7 | 1 | Disinfection Byproducts |
| Sidell | 557 | 13 | 0 | |
| Mark | 555 | 14 | 3 | TTHM |
| Augusta | 553 | 0 | 0 | |
| Mulberry Grove | 548 | 21 | 18 | TTHM, Total Haloacetic Acids (HAA5) |
| Xenia | 542 | 22 | 0 | |
| Farina | 540 | 5 | 0 | |
| Industry | 540 | 13 | 8 | Barium, Copper |
| Lyndon | 537 | 15 | 0 | |
| Good Hope | 536 | 7 | 0 | |
| Wilsonville | 536 | 22 | 0 | |
| Burlington | 535 | 7 | 0 | |
| Mound City | 526 | 14 | 0 | |
| Chadwick | 523 | 57 | 1 | Stage 2 DBP |
| Belknap | 516 | 4 | 0 | |
| Grand Ridge | 515 | 30 | 4 | Barium, TTHM |
| Wapella | 513 | 0 | 0 | |
| Tovey | 512 | 4 | 0 | |
| Reynolds | 508 | 1 | 0 | |
| Colp | 506 | 16 | 2 | Disinfection Byproducts, Stage 2 DBP |
| Waynesville | 502 | 13 | 6 | Selenium |
| West Union | 501 | 13 | 0 | |
| Beecher City | 500 | 68 | 22 | TTHM, Total Haloacetic Acids (HAA5) |
| London Mills | 500 | 33 | 0 | |
| Reddick | 500 | 39 | 11 | TTHM |
| Cornell | 500 | 7 | 0 | |
| Tower Hill | 500 | 8 | 0 | |
| Dakota | 500 | 1 | 0 | |
| Rankin | 500 | 5 | 1 | Stage 2 DBP |
| Golf | 497 | 7 | 0 | |
| Congerville | 497 | 0 | 0 | |
| Ullin | 496 | 9 | 0 | |
| Buckner | 494 | 10 | 0 | |
| Bowen | 494 | 12 | 9 | Disinfection Byproducts |
| Iuka | 486 | 5 | 0 | |
| Burnt Prairie | 486 | 3 | 0 | |
| Fithian | 485 | 7 | 0 | |
| Dundas | 484 | 8 | 4 | TTHM |
| St Peter | 483 | 3 | 0 | |
| Altona | 483 | 10 | 0 | |
| Mt. Auburn | 480 | 13 | 5 | TTHM |
| Versailles | 478 | 4 | 0 | |
| Hammond | 478 | 11 | 2 | Disinfection Byproducts |
| Emden | 467 | 0 | 0 | |
| Ohio | 465 | 1 | 0 | |
| Melvin | 465 | 3 | 0 | |
| Erlanger | 464 | 0 | 0 | |
| Lostant | 463 | 13 | 4 | Disinfection Byproducts, Stage 2 DBP |
| Cutler | 463 | 17 | 8 | Stage 2 DBP, Total Organic Carbon |
| German Valley | 463 | 8 | 2 | Cadmium |
| Plymouth | 460 | 1 | 0 | |
| Allendale | 458 | 16 | 0 | |
| Dalton City | 454 | 11 | 2 | Disinfection Byproducts |
| Adair | 451 | 28 | 28 | TTHM |
| Langleyville | 450 | 2 | 0 | |
| Beaverville | 450 | 7 | 2 | Disinfection Byproducts, Stage 2 DBP |
| Hull | 450 | 0 | 0 | |
| Ipava | 447 | 1 | 0 | |
| Joppa | 445 | 2 | 0 | |
| Alexander | 442 | 11 | 9 | TTHM |
| Edgewood | 440 | 1 | 0 | |
| Marietta | 440 | 0 | 0 | |
| Bonnie | 437 | 13 | 0 | |
| Scales Mound | 436 | 3 | 0 | |
| Chestnut | 435 | 9 | 0 | |
| Olmsted | 435 | 17 | 0 | |
| Middleton | 434 | 5 | 1 | Stage 2 DBP |
| Karnak | 432 | 14 | 0 | |
| Hecker | 429 | 16 | 1 | Disinfection Byproducts |
| Neponset | 427 | 68 | 1 | Stage 2 DBP |
| Prairie City | 425 | 0 | 0 | |
| New Haven | 424 | 1 | 0 | |
| Hopewell | 420 | 15 | 1 | Stage 2 DBP |
| Campbell Hill | 414 | 1 | 0 | |
| Fox Lake | 414 | 3 | 1 | Disinfection Byproducts |
| Desplaines | 405 | 37 | 16 | Contaminant 4109 |
| Weldon | 404 | 13 | 4 | Barium |
| Leaf River | 403 | 5 | 0 | |
| Ellis Grove | 403 | 9 | 0 | |
| Benson | 401 | 7 | 1 | Disinfection Byproducts |
| Perry | 397 | 2 | 0 | |
| Lima | 395 | 7 | 0 | |
| Seymour | 392 | 10 | 3 | Disinfection Byproducts, TTHM |
| Gladstone | 387 | 46 | 0 | |
| Metamore | 387 | 226 | 1 | Disinfection Byproducts |
| Latham | 380 | 12 | 2 | Disinfection Byproducts |
| Joy | 377 | 21 | 0 | |
| Smithfield | 375 | 0 | 0 | |
| Martinton | 375 | 18 | 3 | Disinfection Byproducts |
| Henderson | 375 | 36 | 1 | Stage 2 DBP |
| Irving | 373 | 3 | 0 | |
| Freeman Spur | 373 | 9 | 1 | Stage 2 DBP |
| Carbon Hill | 370 | 12 | 0 | |
| Belleville | 368 | 0 | 0 | |
| Roberts | 367 | 21 | 1 | Disinfection Byproducts |
| Cabery | 366 | 40 | 2 | Disinfection Byproducts |
| Orient | 362 | 1 | 0 | |
| Humboldt | 361 | 4 | 0 | |
| Ivesdale | 360 | 0 | 0 | |
| New Canton | 359 | 0 | 0 | |
| Norris | 358 | 0 | 0 | |
| Sparland | 358 | 2 | 0 | |
| Herrick | 358 | 122 | 3 | Disinfection Byproducts |
| Parkersburg | 356 | 14 | 0 | |
| Colona | 355 | 21 | 1 | Stage 2 DBP |
| Jeffersonville | 355 | 3 | 0 | |
| Table Grove | 353 | 28 | 18 | TTHM |
| Secor | 351 | 49 | 29 | Barium, Disinfection Byproducts, Stage 2 DBP |
| Coldwater | 350 | 8 | 0 | |
| Apple River | 347 | 11 | 0 | |
| Summerfield | 347 | 1 | 0 | |
| Bellflower | 343 | 9 | 0 | |
| New Minden | 343 | 0 | 0 | |
| Ludlow | 342 | 12 | 0 | |
| Ruma | 341 | 9 | 0 | |
| Maeystown | 340 | 47 | 43 | Disinfection Byproducts, Selenium |
| Alma | 336 | 65 | 3 | Total Haloacetic Acids (HAA5) |
| Easton | 334 | 7 | 1 | Disinfection Byproducts |
| Fillmore | 330 | 12 | 1 | Stage 2 DBP |
| Flat Rock | 325 | 6 | 0 | |
| Farmington | 325 | 16 | 0 | |
| Kinderhook | 322 | 0 | 0 | |
| Seatonville | 321 | 56 | 0 | |
| Patterson | 320 | 14 | 2 | Disinfection Byproducts |
| Woodland | 319 | 24 | 6 | Contaminant 1041, Disinfection Byproducts |
| Malden | 318 | 19 | 4 | Disinfection Byproducts, E. coli |
| Arrowsmith | 315 | 4 | 0 | |
| Lee | 313 | 30 | 4 | Disinfection Byproducts |
| Norwood Park Township | 312 | 13 | 5 | Disinfection Byproducts, Stage 2 DBP |
| Armington | 310 | 0 | 0 | |
| Willow Hill | 309 | 30 | 0 | |
| Allerton | 304 | 5 | 0 | |
| Little York | 304 | 12 | 0 | |
| Bardolph | 303 | 20 | 8 | TTHM |
| Loraine | 300 | 65 | 2 | Disinfection Byproducts, Stage 2 DBP |
| Buckingham | 300 | 1 | 0 | |
| Bellmont | 297 | 8 | 0 | |
| Kane | 296 | 2 | 0 | |
| Concord | 295 | 16 | 0 | |
| Batchtown | 290 | 9 | 1 | Disinfection Byproducts |
| Colorado Springs | 290 | 45 | 0 | |
| Brocton | 288 | 64 | 2 | E. coli |
| Glendale | 280 | 5 | 0 | |
| Mccook | 280 | 2 | 0 | |
| Donovan | 279 | 45 | 11 | Disinfection Byproducts |
| Compton | 279 | 45 | 29 | TTHM, Total Haloacetic Acids (HAA5) |
| Royal | 273 | 7 | 0 | |
| Biggsville | 273 | 24 | 2 | Disinfection Byproducts |
| Sibley | 272 | 13 | 4 | Disinfection Byproducts, E. coli |
| Mooseheart | 272 | 6 | 0 | |
| Milton | 271 | 4 | 2 | Disinfection Byproducts |
| Thawville | 270 | 22 | 0 | |
| Alvin | 270 | 11 | 1 | Stage 2 DBP |
| Elliott | 269 | 16 | 1 | Barium |
| Victoria | 268 | 2 | 0 | |
| Rio | 265 | 2 | 0 | |
| Hartsburg | 262 | 2 | 0 | |
| Mapleton | 261 | 17 | 2 | Disinfection Byproducts |
| Rutland | 259 | 1 | 0 | |
| Kingston Mines | 259 | 53 | 1 | Disinfection Byproducts |
| Pulaski | 259 | 7 | 1 | Stage 2 DBP |
| Sims | 259 | 29 | 1 | Stage 2 DBP |
| Mcnabb | 258 | 16 | 5 | Barium, Disinfection Byproducts |
| Jewett | 256 | 1 | 1 | Disinfection Byproducts |
| Butler | 253 | 6 | 3 | Disinfection Byproducts, Stage 2 DBP |
| Richview | 251 | 3 | 0 | |
| Ripley | 250 | 9 | 0 | |
| Arlington | 250 | 66 | 4 | Disinfection Byproducts |
| Palmer | 250 | 0 | 0 | |
| Vermilion | 250 | 12 | 1 | Disinfection Byproducts |
| Lafayette | 250 | 22 | 1 | Stage 2 DBP |
| Roscoe | 250 | 0 | 0 | |
| West Point | 248 | 8 | 0 | |
| Brussels | 245 | 7 | 2 | Disinfection Byproducts |
| Oglesgby | 243 | 3 | 0 | |
| Cisco | 242 | 7 | 3 | Barium, Disinfection Byproducts |
| Steward | 238 | 26 | 13 | Barium, Disinfection Byproducts, Stage 2 DBP |
| La Verne | 238 | 0 | 0 | |
| Kempton | 235 | 43 | 1 | Disinfection Byproducts |
| Broughton | 235 | 26 | 0 | |
| Royal Lakes | 235 | 18 | 3 | Disinfection Byproducts |
| Omaha | 234 | 6 | 2 | E. coli |
| Oakford | 234 | 15 | 0 | |
| Stonefort | 234 | 21 | 0 | |
| Keensburg | 234 | 1 | 0 | |
| Pittsburgh | 230 | 22 | 9 | Contaminant 2920 |
| Mill Shoals | 224 | 5 | 0 | |
| Elizabethtown | 220 | 22 | 0 | |
| Southfield | 220 | 1 | 0 | |
| Spfld | 220 | 0 | 0 | |
| Destin | 218 | 0 | 0 | |
| Maquon | 218 | 12 | 0 | |
| Muscatine | 214 | 12 | 0 | |
| Thebes | 213 | 13 | 0 | |
| Donnellson | 213 | 139 | 65 | TTHM, Total Haloacetic Acids (HAA5) |
| Eldred | 211 | 7 | 0 | |
| Urbana | 209 | 12 | 0 | |
| Bone Gap | 207 | 21 | 0 | |
| Mineral | 206 | 13 | 2 | Disinfection Byproducts, Stage 2 DBP |
| Standard | 203 | 18 | 0 | |
| Metcalf | 200 | 3 | 0 | |
| Austin | 200 | 22 | 0 | |
| Ellsworth | 200 | 4 | 2 | Disinfection Byproducts |
| Lowpoint | 200 | 1 | 0 | |
| Mundelin | 198 | 7 | 0 | |
| Harvel | 191 | 9 | 3 | Disinfection Byproducts |
| Claremont | 190 | 0 | 0 | |
| Smithboro | 188 | 22 | 0 | |
| Fieldon | 186 | 17 | 0 | |
| Waggoner | 186 | 50 | 2 | Disinfection Byproducts |
| Wadsworth | 185 | 7 | 0 | |
| Rockbridge | 180 | 13 | 1 | Stage 2 DBP |
| Raritan | 180 | 3 | 0 | |
| Sciota | 180 | 4 | 0 | |
| Baylis | 180 | 4 | 0 | |
| Indianola | 176 | 0 | 0 | |
| Springerton | 176 | 7 | 1 | Stage 2 DBP |
| Lynn Center | 175 | 9 | 1 | Disinfection Byproducts |
| Hettick | 174 | 35 | 16 | Contaminant 2920, Disinfection Byproducts, E. coli +2 more |
| North Henderson | 172 | 5 | 0 | |
| Calhoun | 172 | 10 | 2 | Disinfection Byproducts |
| Muddy | 171 | 9 | 0 | |
| Chesterfield | 170 | 8 | 0 | |
| Broadwell | 169 | 9 | 0 | |
| Elvaston | 165 | 5 | 0 | |
| Lindenwood | 163 | 13 | 2 | E. coli |
| Beaufort | 163 | 8 | 0 | |
| Anchor | 160 | 2 | 0 | |
| Iola | 158 | 1 | 0 | |
| Longview | 153 | 17 | 4 | Disinfection Byproducts, Total Haloacetic Acids (HAA5) |
| Penfield | 150 | 4 | 1 | Disinfection Byproducts |
| West Brooklyn | 150 | 7 | 0 | |
| Campus | 149 | 25 | 0 | |
| Englewood | 148 | 0 | 0 | |
| Camp Grove | 146 | 12 | 0 | |
| Media | 139 | 10 | 2 | Disinfection Byproducts |
| Bettendorf | 138 | 8 | 0 | |
| Strawn | 133 | 2 | 1 | Stage 2 DBP |
| Lynnville | 130 | 14 | 1 | Stage 2 DBP |
| Mount Erie | 128 | 6 | 4 | TTHM |
| Eagarville | 127 | 48 | 2 | Disinfection Byproducts, Stage 2 DBP |
| Emington | 120 | 16 | 10 | Disinfection Byproducts, Lead |
| Browning | 117 | 6 | 3 | Disinfection Byproducts |
| Sarasota | 116 | 10 | 1 | Disinfection Byproducts |
| Bishop Hill | 113 | 2 | 0 | |
| East Lynn | 112 | 29 | 2 | Disinfection Byproducts, Stage 2 DBP |
| Harmon | 111 | 36 | 3 | Total Organic Carbon |
| Sanford | 108 | 22 | 0 | |
| St Petersburg | 105 | 17 | 1 | Disinfection Byproducts |
| Garden City | 100 | 4 | 0 | |
| Van Orin | 100 | 12 | 4 | Disinfection Byproducts, Stage 2 DBP |
| Bristol | 100 | 7 | 1 | Stage 2 DBP |
| Monroe Center | 100 | 5 | 1 | Disinfection Byproducts |
Data Sources
Drinking water data from the EPA Safe Drinking Water Information System (SDWIS). Only active community water systems (CWS) serving 100+ people are included.