ONALASKA WATERWORKS
Wisconsin - Community Water System - PWSID: WI6320327
System Information
| PWSID | WI6320327 |
| System Name | ONALASKA 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 | Onalaska |
| ZIP Code | 54650 |
| Address | CITY CLERK - JOANN MARCON |
| Organization | CITY OF ONALASKA |
| Phone | - |
Population & Service
| Population Served | 18,000 |
| Service Connections | 5,110 |
Drinking Water Violations (25)
This water system has 25 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, 2010 | Jul 31, 2010 | MCL | Yes | No | - | 5% of samples | - | Resolved | Jul 20, 2010 | - | |
| Jul 1, 2010 | Jul 31, 2010 | MCL | Yes | No | - | 5% of samples | - | Resolved | Jul 20, 2010 | - | |
| Jul 1, 2010 | Jul 31, 2010 | MCL | Yes | No | - | 5% of samples | - | Resolved | Jul 20, 2010 | - | |
| Jul 1, 2010 | Jul 31, 2010 | MCL | Yes | No | - | 5% of samples | - | Resolved | Jul 20, 2010 | - | |
| Jan 1, 2001 | Mar 31, 2001 | MR | No | Yes | - | 10 mg/L | - | Resolved | Mar 31, 2001 | - | |
| Jan 1, 2001 | Mar 31, 2001 | MR | No | Yes | - | 10 mg/L | - | Resolved | Mar 31, 2001 | - | |
| Jan 1, 2001 | Mar 31, 2001 | MR | No | Yes | - | 10 mg/L | - | Resolved | Mar 31, 2001 | - | |
| Jan 1, 2001 | Mar 31, 2001 | MR | No | Yes | - | 10 mg/L | - | Resolved | Mar 31, 2001 | - | |
| Aug 1, 1997 | Aug 31, 1997 | MCL | Yes | No | - | 5% of samples | - | Resolved | Aug 31, 1997 | - | |
| Aug 1, 1997 | Aug 31, 1997 | MCL | Yes | No | - | 5% of samples | - | Resolved | Aug 31, 1997 | - | |
| Aug 1, 1997 | Aug 31, 1997 | MCL | Yes | No | - | 5% of samples | - | Resolved | Aug 31, 1997 | - | |
| Aug 1, 1997 | Aug 31, 1997 | MCL | Yes | No | - | 5% of samples | - | Resolved | Aug 31, 1997 | - | |
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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.