NEPONSET
Illinois - Community Water System - PWSID: IL0110700
System Information
| PWSID | IL0110700 |
| System Name | NEPONSET |
| 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 | NEPONSET |
| ZIP Code | 61345 |
| Address | P.O. BOX 287 |
| Organization | CHAPMAN, MARKUS J. |
| Phone | 309-525-5595 |
Population & Service
| Population Served | 450 |
| Service Connections | 185 |
Drinking Water Violations (1,195)
This water system has 1,195 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 22, 2025 | - | Other | No | No | - | - | - | Unaddressed | - | - | |
| Jul 2, 2025 | - | RPT | No | No | - | - | - | Unaddressed | - | - | |
| Jul 2, 2025 | - | RPT | No | No | - | - | - | Unaddressed | - | - | |
| Jul 1, 2025 | - | Other | No | No | - | - | - | Unaddressed | - | - | |
| Jul 1, 2025 | - | Other | No | No | - | - | - | Unaddressed | - | - | |
| Oct 17, 2024 | - | TT | Yes | No | - | - | - | Unaddressed | - | - | |
| Oct 17, 2024 | - | TT | Yes | No | - | - | - | Unaddressed | - | - | |
| Jul 1, 2023 | - | Other | No | No | - | - | - | Resolved | Jun 18, 2024 | - | |
| Jul 1, 2023 | - | Other | No | No | - | - | - | Resolved | Jun 18, 2024 | - | |
| Dec 30, 2021 | - | MR | No | No | - | TT | - | Resolved | Feb 11, 2022 | - | |
| Dec 30, 2021 | - | MR | No | No | - | TT | - | Resolved | Feb 11, 2022 | - | |
| Jul 1, 2017 | - | Other | No | No | - | - | - | Resolved | Jul 28, 2017 | - | |
| Jul 1, 2017 | - | Other | No | No | - | - | - | Resolved | Jul 28, 2017 | - | |
| May 1, 2015 | May 31, 2015 | MR | No | No | - | 5% of samples | - | Resolved | May 31, 2015 | - | |
| May 1, 2015 | May 31, 2015 | MR | No | No | - | 5% of samples | - | Resolved | May 31, 2015 | - | |
| May 1, 2015 | May 31, 2015 | MR | No | No | - | 5% of samples | - | Resolved | May 31, 2015 | - | |
| May 1, 2015 | May 31, 2015 | MR | No | No | - | 5% of samples | - | Resolved | May 31, 2015 | - | |
| Apr 1, 2015 | Jun 30, 2015 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Jun 26, 2015 | - | |
| Apr 1, 2015 | Jun 30, 2015 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Jun 26, 2015 | - | |
| Apr 1, 2015 | Jun 30, 2015 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Jun 26, 2015 | - | |
| Apr 1, 2015 | Jun 30, 2015 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Jun 26, 2015 | - | |
| Jan 2, 2013 | - | MR | No | No | - | TT | - | Resolved | Sep 16, 2013 | - | |
| Jan 2, 2013 | - | MR | No | No | - | TT | - | Resolved | Sep 16, 2013 | - | |
| Jan 1, 2013 | Mar 31, 2013 | MCL | Yes | No | 7 PCI/L | 5 pCi/L | 5 | Resolved | Mar 31, 2013 | - | |
| Jan 1, 2013 | Mar 31, 2013 | MCL | Yes | No | 7 PCI/L | 5 pCi/L | 5 | Resolved | Mar 31, 2013 | - | |
| Jan 1, 2013 | Mar 31, 2013 | MCL | Yes | No | 7 PCI/L | 5 pCi/L | 5 | Resolved | Mar 31, 2013 | - | |
| Jan 1, 2013 | Mar 31, 2013 | MCL | Yes | No | 7 PCI/L | 5 pCi/L | 5 | Resolved | Mar 31, 2013 | - | |
| Jan 1, 2013 | Mar 31, 2013 | MCL | Yes | No | 7 PCI/L | 5 pCi/L | 5 | Resolved | Mar 31, 2013 | - | |
| Jan 1, 2013 | Mar 31, 2013 | MCL | Yes | No | 7 PCI/L | 5 pCi/L | 5 | Resolved | Mar 31, 2013 | - | |
| Jan 1, 2013 | Mar 31, 2013 | MCL | Yes | No | 7 PCI/L | 5 pCi/L | 5 | Resolved | Mar 31, 2013 | - | |
| Jan 1, 2013 | Mar 31, 2013 | MCL | Yes | No | 7 PCI/L | 5 pCi/L | 5 | Resolved | Mar 31, 2013 | - | |
| Oct 1, 2012 | Dec 31, 2012 | MCL | Yes | No | 10 PCI/L | 5 pCi/L | 5 | Resolved | Dec 31, 2012 | - | |
| Oct 1, 2012 | Dec 31, 2012 | MCL | Yes | No | 10 PCI/L | 5 pCi/L | 5 | Resolved | Dec 31, 2012 | - | |
| Oct 1, 2012 | Dec 31, 2012 | MCL | Yes | No | 25 PCI/L | 15 pCi/L | 15 | Resolved | Dec 31, 2012 | - | |
| Oct 1, 2012 | Dec 31, 2012 | MCL | Yes | No | 25 PCI/L | 15 pCi/L | 15 | Resolved | Dec 31, 2012 | - | |
| Oct 1, 2012 | Dec 31, 2012 | MCL | Yes | No | 25 PCI/L | 15 pCi/L | 15 | Resolved | Dec 31, 2012 | - | |
| Oct 1, 2012 | Dec 31, 2012 | MCL | Yes | No | 10 PCI/L | 5 pCi/L | 5 | Resolved | Dec 31, 2012 | - | |
| Oct 1, 2012 | Dec 31, 2012 | MCL | Yes | No | 10 PCI/L | 5 pCi/L | 5 | Resolved | Dec 31, 2012 | - | |
| Oct 1, 2012 | Dec 31, 2012 | MCL | Yes | No | 25 PCI/L | 15 pCi/L | 15 | Resolved | Dec 31, 2012 | - | |
| Oct 1, 2012 | Dec 31, 2012 | MCL | Yes | No | 25 PCI/L | 15 pCi/L | 15 | Resolved | Dec 31, 2012 | - | |
| Oct 1, 2012 | Dec 31, 2012 | MCL | Yes | No | 10 PCI/L | 5 pCi/L | 5 | Resolved | Dec 31, 2012 | - | |
| Oct 1, 2012 | Dec 31, 2012 | MCL | Yes | No | 25 PCI/L | 15 pCi/L | 15 | Resolved | Dec 31, 2012 | - | |
| Oct 1, 2012 | Dec 31, 2012 | MCL | Yes | No | 25 PCI/L | 15 pCi/L | 15 | Resolved | Dec 31, 2012 | - | |
| Oct 1, 2012 | Dec 31, 2012 | MCL | Yes | No | 25 PCI/L | 15 pCi/L | 15 | Resolved | Dec 31, 2012 | - | |
| Oct 1, 2012 | Dec 31, 2012 | MCL | Yes | No | 10 PCI/L | 5 pCi/L | 5 | Resolved | Dec 31, 2012 | - | |
| Oct 1, 2012 | Dec 31, 2012 | MCL | Yes | No | 10 PCI/L | 5 pCi/L | 5 | Resolved | Dec 31, 2012 | - | |
| Oct 1, 2012 | Dec 31, 2012 | MCL | Yes | No | 10 PCI/L | 5 pCi/L | 5 | Resolved | Dec 31, 2012 | - | |
| Jul 11, 2012 | - | Other | No | No | - | - | - | Resolved | Aug 22, 2012 | - | |
| Jul 11, 2012 | - | Other | No | No | - | - | - | Resolved | Aug 22, 2012 | - | |
| Jul 11, 2012 | - | Other | No | No | - | - | - | Resolved | Aug 22, 2012 | - |
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.