All water systems in Illinois
5,097 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Centralia Centralia · Marion County |
12,182 | 1 | 0 | |
|
Captain James a Lovell Fhcc Lake County |
12,100 | 6 | 2 | |
|
Washington County Water Company Nashville · Washington County |
12,040 | 1 | 0 | |
|
IL American-Pontiac Pontiac · Livingston County |
11,864 | 0 | 0 | |
|
Fox Lake Fox Lake · Lake County |
11,780 | 5 | 1 | |
|
River Forest River Forest · Cook County |
11,717 | 2 | 1 | |
|
Schiller Park Schiller Park · Cook County |
11,709 | 1 | 1 | |
|
Lake of Egypt Pwd Marion · Williamson County |
11,368 | 1 | 0 | |
|
Robinson-Palestine Water Commission Crawford County |
11,331 | 3 | 0 | |
|
Sugar Grove Sugar Grove · Kane County |
11,243 | 1 | 0 | |
|
Burr Ridge Burr Ridge · DuPage County |
11,192 | 1 | 0 | |
|
IL American-Chicago Suburban Cook County |
11,187 | 0 | 0 | |
|
Summit Summit · Cook County |
11,161 | 3 | 3 | |
|
Columbia Columbia · Monroe County |
11,129 | 1 | 1 | |
|
Worth Worth · Cook County |
10,970 | 1 | 0 | |
|
Crestwood Crestwood · Cook County |
10,826 | 2 | 1 | |
|
Highland Highland · Madison County |
10,674 | 3 | 0 | |
|
Wood River Wood River · Madison County |
10,464 | 1 | 0 | |
|
Pingree Grove Hampshire · Kane County |
10,365 | 4 | 1 | |
|
Manhattan Manhattan · Will County |
10,340 | 1 | 0 | |
|
Barrington Barrington · Lake County |
10,327 | 0 | 0 | |
|
Lyons Lyons · Cook County |
10,304 | 1 | 1 | |
|
River Grove River Grove · Cook County |
10,282 | 1 | 0 | |
|
Riverdale Riverdale · Cook County |
10,266 | 1 | 1 | |
|
Murphysboro Murphysboro · Jackson County |
10,241 | 3 | 1 | |
|
Waterloo Waterloo · Monroe County |
10,190 | 7 | 0 | |
|
Maryville Maryville · Madison County |
10,150 | 1 | 1 | |
|
Advocate Christ Medical Center Cook County |
10,000 | 5 | 1 | |
|
Leyden Twsp Water District Cook County |
10,000 | 0 | 0 | |
|
Osf ST Francis Hospital Peoria County |
10,000 | 4 | 1 | |
|
Sauk Village Sauk · Cook County |
9,921 | 4 | 0 | |
|
Peru Peru · LaSalle County |
9,896 | 2 | 0 | |
|
Winfield Winfield · DuPage County |
9,835 | 0 | 0 | |
|
LA Salle La Salle · LaSalle County |
9,700 | 4 | 0 | |
|
Steger Steger · Cook County |
9,700 | 2 | 1 | |
|
Lynwood Lynwood · Cook County |
9,698 | 1 | 0 | |
|
Clark-Edgar Rwd Clark County |
9,657 | 0 | 0 | |
|
Itasca Itasca · DuPage County |
9,506 | 0 | 0 | |
|
Harvard Harvard · McHenry County |
9,469 | 0 | 0 | |
|
Rochelle Rochelle · Ogle County |
9,446 | 1 | 0 | |
|
Oak Brook Oak Brook · DuPage County |
9,400 | 3 | 0 | |
|
Flossmoor Flossmoor · Cook County |
9,371 | 1 | 1 | |
|
Riverside Riverside · Cook County |
9,298 | 1 | 0 | |
|
Paris Paris · Edgar County |
9,100 | 1 | 1 | |
|
Harwood Heights Harwood Heights · Cook County |
9,065 | 0 | 0 | |
|
Willowbrook Willowbrook · DuPage County |
9,000 | 3 | 2 | |
|
Glenwood Glenwood · Cook County |
8,956 | 3 | 0 | |
|
Monmouth Monmouth · Warren County |
8,902 | 2 | 0 | |
|
Clear Water Service Corp Coles County |
8,900 | 2 | 0 | |
|
Olney Olney · Richland County |
8,877 | 1 | 0 |
About this data
Rules violated counts the rules a system was in violation of in the past three years, including monitoring and reporting lapses; one rule can carry several violations. Unresolved is the number of those rules still in violation at EPA's latest data refresh.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Illinois records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.