MONTELLO WATERWORKS
Wisconsin — Community Water System — PWSID: WI4390281
System Information
| PWSID | WI4390281 |
| System Name | MONTELLO WATERWORKS |
| 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 | Jan 28, 1981 |
| Last Reported | Mar 2, 2026 |
Location & Contact
| State | Wisconsin |
| City | MONTELLO |
| ZIP Code | 53949 |
| Address | 20 UNDERWOOD AVE |
| Organization | MONTELLO CITY CLERK |
| Phone | — |
Population & Service
| Population Served | 1,329 |
| Service Connections | 492 |
Drinking Water Violations (35)
This water system has 35 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Oct 1, 2025 | — | Other | No | No | — | — | — | Unaddressed | — | — | |
| Apr 29, 2025 | — | TT | Yes | No | — | — | — | Resolved | Jul 1, 2025 | — | |
| Apr 29, 2025 | — | TT | Yes | No | — | — | — | Resolved | Jul 1, 2025 | — | |
| Apr 29, 2025 | — | TT | Yes | No | — | — | — | Resolved | Jul 1, 2025 | — | |
| Oct 17, 2024 | — | RPT | No | No | — | — | — | Resolved | Jun 4, 2025 | — | |
| Oct 17, 2024 | — | Other | No | No | — | — | — | Unaddressed | — | — | |
| Oct 17, 2024 | — | Other | No | No | — | — | — | Unaddressed | — | — | |
| Oct 17, 2024 | — | TT | Yes | No | — | — | — | Resolved | Jun 4, 2025 | — | |
| Jan 1, 2014 | Dec 31, 2014 | MR | No | No | — | 0.080 mg/L | — | Resolved | Dec 31, 2014 | — | |
| Jan 1, 2014 | Dec 31, 2014 | MR | No | No | — | 0.080 mg/L | — | Resolved | Dec 31, 2014 | — | |
| Jan 1, 2014 | Dec 31, 2014 | MR | No | No | — | 0.080 mg/L | — | Resolved | Dec 31, 2014 | — | |
| Jan 1, 2014 | Dec 31, 2014 | MR | No | No | — | 0.080 mg/L | — | Resolved | Dec 31, 2014 | — | |
| Jan 1, 2014 | Dec 31, 2014 | MR | No | No | — | 0.060 mg/L | — | Resolved | Dec 31, 2014 | — | |
| Jan 1, 2014 | Dec 31, 2014 | MR | No | No | — | 0.060 mg/L | — | Resolved | Dec 31, 2014 | — | |
| Jan 1, 2014 | Dec 31, 2014 | MR | No | No | — | 0.060 mg/L | — | Resolved | Dec 31, 2014 | — | |
| Jan 1, 2014 | Dec 31, 2014 | MR | No | No | — | 0.060 mg/L | — | Resolved | Dec 31, 2014 | — | |
| Jun 1, 2009 | Jun 30, 2009 | MCL | Yes | No | — | 5% of samples | — | Resolved | Jun 27, 2009 | — | |
| Jun 1, 2009 | Jun 30, 2009 | MCL | Yes | No | — | 5% of samples | — | Resolved | Jun 27, 2009 | — | |
| Jun 1, 2009 | Jun 30, 2009 | MCL | Yes | No | — | 5% of samples | — | Resolved | Jun 27, 2009 | — | |
| Jun 1, 2009 | Jun 30, 2009 | MCL | Yes | No | — | 5% of samples | — | Resolved | Jun 27, 2009 | — | |
| Jun 1, 2009 | Jun 30, 2009 | MCL | Yes | No | — | 5% of samples | — | Resolved | Jun 27, 2009 | — | |
| Jul 1, 1996 | — | MR | No | No | — | TT | — | Resolved | Jun 30, 1997 | — | |
| Jul 1, 1994 | — | TT | Yes | No | — | TT | — | Resolved | Apr 5, 1996 | — | |
| Oct 1, 1993 | Oct 31, 1993 | MCL | Yes | No | — | 5% of samples | — | Resolved | Oct 31, 1993 | — | |
| Oct 1, 1993 | Oct 31, 1993 | MCL | Yes | No | — | 5% of samples | — | Resolved | Oct 31, 1993 | — | |
| Oct 1, 1993 | Oct 31, 1993 | MCL | Yes | No | — | 5% of samples | — | Resolved | Oct 31, 1993 | — | |
| Oct 1, 1993 | Oct 31, 1993 | MCL | Yes | No | — | 5% of samples | — | Resolved | Oct 31, 1993 | — | |
| Aug 1, 1993 | Aug 31, 1993 | MCL | Yes | No | — | 5% of samples | — | Resolved | Aug 31, 1993 | — | |
| Aug 1, 1993 | Aug 31, 1993 | MCL | Yes | No | — | 5% of samples | — | Resolved | Aug 31, 1993 | — | |
| Aug 1, 1993 | Aug 31, 1993 | MCL | Yes | No | — | 5% of samples | — | Resolved | Aug 31, 1993 | — | |
| Aug 1, 1993 | Aug 31, 1993 | MCL | Yes | No | — | 5% of samples | — | Resolved | Aug 31, 1993 | — | |
| — | — | — | No | No | — | — | — | — | — | — | |
| — | — | — | No | No | — | — | — | — | — | — | |
| — | — | — | No | No | — | — | — | — | — | — | |
| — | — | — | No | No | — | — | — | — | — | — |
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.