O FALLON
Illinois - Community Water System - PWSID: IL1631100
System Information
| PWSID | IL1631100 |
| System Name | O FALLON |
| System Type | Community Water System |
| Water Source | Surface Water Purchased |
| 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 | O'FALLON |
| ZIP Code | 62269 |
| Address | CITY HALL |
| Organization | BELL, HEIDE |
| Phone | 618-624-4500 |
Population & Service
| Population Served | 46,603 |
| Service Connections | 18,497 |
Drinking Water Violations (102)
This water system has 102 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan 1, 2007 | Jun 30, 2007 | MR | No | No | - | TT | - | Resolved | Jun 30, 2007 | - | |
| Jan 1, 2007 | Jun 30, 2007 | MR | No | No | - | TT | - | Resolved | Jun 30, 2007 | - | |
| Jul 1, 1999 | Jul 31, 1999 | MCL | Yes | No | - | 5% of samples | - | Archived | Jul 31, 1999 | - | |
| Jul 1, 1999 | Jul 31, 1999 | MCL | Yes | No | - | 5% of samples | - | Archived | Jul 31, 1999 | - | |
| Jul 1, 1999 | Jul 31, 1999 | MR | No | No | - | 5% of samples | - | Archived | Jul 31, 1999 | - | |
| Jul 1, 1999 | Jul 31, 1999 | MR | No | No | - | 5% of samples | - | Archived | Jul 31, 1999 | - | |
| Apr 1, 1998 | Apr 30, 1998 | MCL | Yes | No | - | 5% of samples | - | Archived | Apr 30, 1998 | - | |
| Apr 1, 1998 | Apr 30, 1998 | MCL | Yes | No | - | 5% of samples | - | Archived | Apr 30, 1998 | - | |
| Apr 1, 1998 | Apr 30, 1998 | MCL | Yes | No | - | 5% of samples | - | Archived | Apr 30, 1998 | - | |
| Apr 1, 1998 | Apr 30, 1998 | MCL | Yes | No | - | 5% of samples | - | Archived | Apr 30, 1998 | - | |
| Apr 1, 1997 | Jun 30, 1997 | MR | No | No | - | TT | - | Resolved | Jun 30, 1997 | - | |
| Jan 1, 1997 | Mar 31, 1997 | MR | No | No | - | TT | - | Resolved | Mar 31, 1997 | - | |
| Aug 1, 1996 | Aug 31, 1996 | MCL | Yes | No | - | 5% of samples | - | Archived | Aug 31, 1996 | - | |
| Aug 1, 1996 | Aug 31, 1996 | MCL | Yes | No | - | 5% of samples | - | Archived | Aug 31, 1996 | - | |
| Aug 1, 1996 | Aug 31, 1996 | MCL | Yes | No | - | 5% of samples | - | Archived | Aug 31, 1996 | - | |
| Mar 1, 1996 | Mar 31, 1996 | MCL | Yes | No | - | 5% of samples | - | Archived | Mar 31, 1996 | - | |
| Nov 1, 1995 | Nov 30, 1995 | MCL | Yes | No | - | 5% of samples | - | Archived | Nov 30, 1995 | - | |
| Nov 1, 1995 | Nov 30, 1995 | MCL | Yes | No | - | 5% of samples | - | Archived | Nov 30, 1995 | - | |
| Feb 1, 1995 | Feb 28, 1995 | MR | No | No | - | 5% of samples | - | Archived | Feb 28, 1995 | - | |
| Feb 1, 1995 | Feb 28, 1995 | MR | No | No | - | 5% of samples | - | Archived | Feb 28, 1995 | - | |
| Feb 1, 1995 | Feb 28, 1995 | MR | No | No | - | 5% of samples | - | Archived | Feb 28, 1995 | - | |
| Sep 1, 1994 | Sep 30, 1994 | MR | No | No | - | 5% of samples | - | Archived | Sep 30, 1994 | - | |
| Sep 1, 1994 | Sep 30, 1994 | MCL | Yes | No | - | 5% of samples | - | Archived | Sep 30, 1994 | - | |
| Sep 1, 1994 | Sep 30, 1994 | MCL | Yes | No | - | 5% of samples | - | Archived | Sep 30, 1994 | - | |
| Sep 1, 1994 | Sep 30, 1994 | MCL | Yes | No | - | 5% of samples | - | Archived | Sep 30, 1994 | - | |
| Sep 1, 1994 | Sep 30, 1994 | MR | No | No | - | 5% of samples | - | Archived | Sep 30, 1994 | - | |
| Jul 1, 1994 | Jul 31, 1994 | MCL | Yes | No | - | 5% of samples | - | Archived | Jul 31, 1994 | - | |
| Jul 1, 1994 | Jul 31, 1994 | MCL | Yes | No | - | 5% of samples | - | Archived | Jul 31, 1994 | - | |
| Jul 1, 1994 | Jul 31, 1994 | MCL | Yes | No | - | 5% of samples | - | Archived | Jul 31, 1994 | - | |
| Jul 1, 1994 | Jul 31, 1994 | MCL | Yes | No | - | 5% of samples | - | Archived | Jul 31, 1994 | - | |
| Jul 1, 1994 | Jul 31, 1994 | MCL | Yes | No | - | 5% of samples | - | Archived | Jul 31, 1994 | - | |
| Jul 1, 1994 | Jul 31, 1994 | MCL | Yes | No | - | 5% of samples | - | Archived | Jul 31, 1994 | - | |
| Feb 1, 1994 | Feb 28, 1994 | MCL | Yes | No | - | 5% of samples | - | Archived | Feb 28, 1994 | - | |
| Feb 1, 1994 | Feb 28, 1994 | MCL | Yes | No | - | 5% of samples | - | Archived | Feb 28, 1994 | - | |
| Feb 1, 1994 | Feb 28, 1994 | MR | No | No | - | 5% of samples | - | Archived | Feb 28, 1994 | - | |
| Feb 1, 1994 | Feb 28, 1994 | MR | No | No | - | 5% of samples | - | Archived | Feb 28, 1994 | - | |
| Feb 1, 1994 | Feb 28, 1994 | MR | No | No | - | 5% of samples | - | Archived | Feb 28, 1994 | - | |
| Feb 1, 1994 | Feb 28, 1994 | MR | No | No | - | 5% of samples | - | Archived | Feb 28, 1994 | - | |
| Feb 1, 1994 | Feb 28, 1994 | MR | No | No | - | 5% of samples | - | Archived | Feb 28, 1994 | - | |
| Feb 1, 1994 | Feb 28, 1994 | MR | No | No | - | 5% of samples | - | Archived | Feb 28, 1994 | - | |
| Feb 1, 1994 | Feb 28, 1994 | MCL | Yes | No | - | 5% of samples | - | Archived | Feb 28, 1994 | - | |
| Feb 1, 1994 | Feb 28, 1994 | MCL | Yes | No | - | 5% of samples | - | Archived | Feb 28, 1994 | - | |
| Feb 1, 1994 | Feb 28, 1994 | MCL | Yes | No | - | 5% of samples | - | Archived | Feb 28, 1994 | - | |
| Feb 1, 1994 | Feb 28, 1994 | MCL | Yes | No | - | 5% of samples | - | Archived | Feb 28, 1994 | - | |
| Feb 1, 1994 | Feb 28, 1994 | MCL | Yes | No | - | 5% of samples | - | Archived | Feb 28, 1994 | - | |
| Sep 1, 1993 | - | TT | Yes | No | - | TT | - | Resolved | Feb 6, 1995 | - | |
| Aug 1, 1993 | Aug 31, 1993 | MCL | Yes | No | - | 5% of samples | - | Archived | Aug 31, 1993 | - | |
| Aug 1, 1993 | Aug 31, 1993 | MR | No | No | - | 5% of samples | - | Archived | Aug 31, 1993 | - | |
| Aug 1, 1993 | Aug 31, 1993 | MCL | Yes | No | - | 5% of samples | - | Archived | Aug 31, 1993 | - | |
| Aug 1, 1993 | Aug 31, 1993 | MCL | Yes | No | - | 5% of samples | - | Archived | Aug 31, 1993 | - |
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.