MAQUON
Illinois - Community Water System - PWSID: IL0950350
System Information
| PWSID | IL0950350 |
| System Name | MAQUON |
| 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 | MAQUON |
| ZIP Code | 61458 |
| Address | P.O. Box 109 |
| Organization | THOMAS, MARK |
| Phone | 309-875-3553 |
Population & Service
| Population Served | 218 |
| Service Connections | 149 |
Drinking Water Violations (90)
This water system has 90 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Aug 1, 2024 | Aug 31, 2024 | MON | No | Yes | - | - | - | Resolved | Aug 31, 2024 | - | |
| Aug 1, 2024 | Aug 31, 2024 | MON | No | Yes | - | - | - | Resolved | Aug 31, 2024 | - | |
| Aug 1, 2024 | Aug 31, 2024 | MON | No | Yes | - | - | - | Resolved | Aug 31, 2024 | - | |
| Aug 1, 2024 | Aug 31, 2024 | MON | No | Yes | - | - | - | Resolved | Aug 31, 2024 | - | |
| Jul 1, 2024 | Sep 30, 2024 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Sep 30, 2024 | - | |
| Jul 1, 2024 | Sep 30, 2024 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Sep 30, 2024 | - | |
| Jul 1, 2024 | Sep 30, 2024 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Sep 30, 2024 | - | |
| Jul 1, 2024 | Sep 30, 2024 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Sep 30, 2024 | - | |
| Jan 1, 2023 | Dec 31, 2025 | MR | No | Yes | - | 0.060 mg/L | - | Archived | Dec 31, 2025 | - | |
| Jan 1, 2023 | Dec 31, 2025 | MR | No | Yes | - | 0.060 mg/L | - | Archived | Dec 31, 2025 | - | |
| Dec 30, 2022 | - | MR | No | No | - | TT | - | Resolved | Jun 27, 2023 | - | |
| Dec 30, 2022 | - | MR | No | No | - | TT | - | Resolved | Jun 27, 2023 | - | |
| Jan 1, 2009 | Mar 31, 2009 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Mar 31, 2009 | - | |
| Jan 1, 2009 | Mar 31, 2009 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Mar 31, 2009 | - | |
| Oct 1, 2007 | Dec 31, 2007 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Dec 31, 2007 | - | |
| Oct 1, 2007 | Dec 31, 2007 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Dec 31, 2007 | - | |
| Oct 1, 2007 | Dec 31, 2007 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Dec 31, 2007 | - | |
| Oct 1, 2007 | Dec 31, 2007 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Dec 31, 2007 | - | |
| Jul 1, 2005 | Sep 30, 2005 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Sep 30, 2005 | - | |
| Jul 1, 2005 | Sep 30, 2005 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Sep 30, 2005 | - | |
| Jul 1, 2005 | Sep 30, 2005 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Sep 30, 2005 | - | |
| Jul 1, 2005 | Sep 30, 2005 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Sep 30, 2005 | - | |
| Apr 1, 1999 | Jun 30, 1999 | MCL | Yes | No | .004 | 4.0 mg/L | - | Resolved | Jun 30, 1999 | - | |
| Apr 1, 1999 | Jun 30, 1999 | MCL | Yes | No | .004 | 4.0 mg/L | - | Resolved | Jun 30, 1999 | - | |
| Apr 1, 1999 | Jun 30, 1999 | MCL | Yes | No | .004 | 4.0 mg/L | - | Resolved | Jun 30, 1999 | - | |
| Aug 1, 1995 | Aug 31, 1995 | MR | No | No | - | 5% of samples | - | Archived | Aug 31, 1995 | - | |
| Aug 1, 1995 | Aug 31, 1995 | MR | No | No | - | 5% of samples | - | Archived | Aug 31, 1995 | - | |
| Aug 1, 1995 | Aug 31, 1995 | MR | No | No | - | 5% of samples | - | Archived | Aug 31, 1995 | - | |
| Jan 1, 1994 | Dec 31, 1994 | MR | No | Yes | - | 10 mg/L | - | Resolved | Dec 31, 1994 | - | |
| Jan 1, 1994 | Dec 31, 1994 | MR | No | Yes | - | 10 mg/L | - | Resolved | Dec 31, 1994 | - | |
| Jan 1, 1994 | Dec 31, 1994 | MR | No | Yes | - | 10 mg/L | - | Resolved | Dec 31, 1994 | - | |
| Jan 1, 1994 | Dec 31, 1994 | MR | No | Yes | - | 10 mg/L | - | Resolved | Dec 31, 1994 | - | |
| Feb 1, 1991 | Feb 28, 1991 | MR | No | No | - | 5% of samples | - | Archived | Feb 28, 1991 | - | |
| Feb 1, 1991 | Feb 28, 1991 | MR | No | No | - | 5% of samples | - | Archived | Feb 28, 1991 | - | |
| Feb 1, 1991 | Feb 28, 1991 | MR | No | No | - | 5% of samples | - | Archived | Feb 28, 1991 | - | |
| Sep 1, 1986 | Aug 31, 1989 | MR | No | Yes | - | 2 mg/L | - | Archived | Aug 31, 1989 | - | |
| Sep 1, 1986 | Aug 31, 1989 | MR | No | Yes | - | 4.0 mg/L | - | Archived | Aug 31, 1989 | - | |
| Sep 1, 1986 | Aug 31, 1989 | MR | No | Yes | - | 4.0 mg/L | - | Archived | Aug 31, 1989 | - | |
| Sep 1, 1986 | Aug 31, 1989 | MR | No | Yes | - | 4.0 mg/L | - | Archived | Aug 31, 1989 | - | |
| Sep 1, 1986 | Aug 31, 1989 | MR | No | Yes | - | 4.0 mg/L | - | Archived | Aug 31, 1989 | - | |
| Sep 1, 1986 | Aug 31, 1989 | MR | No | Yes | - | 0.002 mg/L | - | Archived | Aug 31, 1989 | - | |
| Sep 1, 1986 | Aug 31, 1989 | MR | No | Yes | - | 0.002 mg/L | - | Archived | Aug 31, 1989 | - | |
| Sep 1, 1986 | Aug 31, 1989 | MR | No | Yes | - | 0.002 mg/L | - | Archived | Aug 31, 1989 | - | |
| Sep 1, 1986 | Aug 31, 1989 | MR | No | Yes | - | 0.002 mg/L | - | Archived | Aug 31, 1989 | - | |
| Sep 1, 1986 | Aug 31, 1989 | MR | No | Yes | - | 2 mg/L | - | Archived | Aug 31, 1989 | - | |
| Sep 1, 1986 | Aug 31, 1989 | MR | No | Yes | - | 0.005 mg/L | - | Archived | Aug 31, 1989 | - | |
| Sep 1, 1986 | Aug 31, 1989 | MR | No | Yes | - | 2 mg/L | - | Archived | Aug 31, 1989 | - | |
| Sep 1, 1986 | Aug 31, 1989 | MR | No | Yes | - | 2 mg/L | - | Archived | Aug 31, 1989 | - | |
| Sep 1, 1986 | Aug 31, 1989 | MR | No | Yes | - | 0.05 mg/L | - | Archived | Aug 31, 1989 | - | |
| Sep 1, 1986 | Aug 31, 1989 | MR | No | Yes | - | 0.05 mg/L | - | Archived | Aug 31, 1989 | - |
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.