ST CHARLES
Illinois — Community Water System — PWSID: IL0894830
System Information
| PWSID | IL0894830 |
| System Name | ST CHARLES |
| System Type | Community Water System |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Local |
| EPA Region | 05 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Feb 13, 1981 |
| Last Reported | Feb 26, 2026 |
Location & Contact
| State | Illinois |
| City | ST. CHARLES |
| ZIP Code | 60174 |
| Address | CITY OF ST. CHARLES |
| Organization | WILSON, TIMOTHY W. |
| Phone | 630-377-4405 |
Population & Service
| Population Served | 33,103 |
| Service Connections | 12,690 |
Drinking Water Violations (37)
This water system has 37 violations recorded in the EPA SDWIS database.
| Begin Date | End Date | Contaminant | Category | Health-Based | Major | Measured | Federal MCL | State MCL | Status | Return to Compliance | Rule |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jul 1, 2025 | — | Other | No | No | — | — | — | Unaddressed | — | — | |
| Oct 1, 2020 | Dec 31, 2020 | MR | No | Yes | — | 5 pCi/L | — | Resolved | Dec 31, 2020 | — | |
| Oct 1, 2020 | Dec 31, 2020 | MR | No | Yes | — | 5 pCi/L | — | Resolved | Dec 31, 2020 | — | |
| Jul 1, 2016 | — | Other | No | No | — | — | — | Resolved | Jul 7, 2017 | — | |
| Jul 1, 2016 | — | Other | No | No | — | — | — | Resolved | Jul 7, 2017 | — | |
| Jan 1, 2002 | Dec 31, 2002 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2002 | — | |
| Jan 1, 2002 | Dec 31, 2002 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2002 | — | |
| Jan 1, 2002 | Dec 31, 2002 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2002 | — | |
| Jan 1, 2002 | Dec 31, 2002 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2002 | — | |
| Jul 1, 1995 | Jul 31, 1995 | MR | No | No | — | 5% of samples | — | Archived | Jul 31, 1995 | — | |
| Jul 1, 1995 | Jul 31, 1995 | MR | No | No | — | 5% of samples | — | Archived | Jul 31, 1995 | — | |
| Jul 1, 1995 | Jul 31, 1995 | MCL | Yes | No | — | 5% of samples | — | Archived | Jul 31, 1995 | — | |
| Jul 1, 1995 | Jul 31, 1995 | MCL | Yes | No | — | 5% of samples | — | Archived | Jul 31, 1995 | — | |
| Jan 30, 1991 | Jan 29, 1995 | MCL | Yes | No | 15.6 | 5 pCi/L | — | Resolved | Jul 15, 1992 | — | |
| Jan 30, 1991 | Jan 29, 1995 | MCL | Yes | No | 25.7 | 15 pCi/L | — | Resolved | Nov 18, 1991 | — | |
| Jan 30, 1991 | Jan 29, 1995 | MCL | Yes | No | 15.6 | 5 pCi/L | — | Resolved | Jul 15, 1992 | — | |
| Jan 30, 1991 | Jan 29, 1995 | MCL | Yes | No | 15.6 | 5 pCi/L | — | Resolved | Jul 15, 1992 | — | |
| Jan 30, 1991 | Jan 29, 1995 | MCL | Yes | No | 15.6 | 5 pCi/L | — | Resolved | Jul 15, 1992 | — | |
| Jan 30, 1991 | Jan 29, 1995 | MCL | Yes | No | 15.6 | 5 pCi/L | — | Resolved | Jul 15, 1992 | — | |
| Jan 30, 1991 | Jan 29, 1995 | MCL | Yes | No | 15.6 | 5 pCi/L | — | Resolved | Jul 15, 1992 | — | |
| Jan 30, 1991 | Jan 29, 1995 | MCL | Yes | No | 25.7 | 15 pCi/L | — | Resolved | Nov 18, 1991 | — | |
| Jan 30, 1991 | Jan 29, 1995 | MCL | Yes | No | 25.7 | 15 pCi/L | — | Resolved | Nov 18, 1991 | — | |
| Jan 30, 1991 | Jan 29, 1995 | MCL | Yes | No | 25.7 | 15 pCi/L | — | Resolved | Nov 18, 1991 | — | |
| Jan 30, 1991 | Jan 29, 1995 | MCL | Yes | No | 15.6 | 5 pCi/L | — | Resolved | Jul 15, 1992 | — | |
| Jun 30, 1977 | Jun 29, 1981 | MR | No | No | — | 15 pCi/L | — | Archived | Jun 29, 1981 | — | |
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About This Water System
Public water system data comes from the EPA Safe Drinking Water Information System (SDWIS). Systems with violations must notify customers. Contact your water utility for the latest annual water quality report.