HAPPY VALLEY MHP
Montana - Community Water System - PWSID: MT0000377
System Information
| PWSID | MT0000377 |
| System Name | HAPPY VALLEY MHP |
| System Type | Community Water System |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Private |
| EPA Region | 08 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Feb 13, 1979 |
| Last Reported | Mar 26, 2026 |
Location & Contact
| State | Montana |
| City | MISSOULA |
| ZIP Code | 59807 |
| Address | PO BOX 8616 |
| Organization | MULLINS, NATHAN |
| Phone | 406-317-3913 |
Population & Service
| Population Served | 55 |
| Service Connections | 22 |
Drinking Water Violations (51)
This water system has 51 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Dec 30, 2024 | - | MR | No | No | - | TT | - | Resolved | Nov 14, 2025 | - | |
| Dec 30, 2024 | - | MR | No | No | - | TT | - | Resolved | Nov 14, 2025 | - | |
| Jul 1, 2017 | - | Other | No | No | - | - | - | Resolved | Aug 30, 2017 | - | |
| Jul 1, 2017 | - | Other | No | No | - | - | - | Resolved | Aug 30, 2017 | - | |
| Jul 1, 2015 | - | Other | No | No | - | - | - | Resolved | Jul 17, 2015 | - | |
| Jul 1, 2015 | - | Other | No | No | - | - | - | Resolved | Jul 17, 2015 | - | |
| Oct 1, 2013 | - | Other | No | No | - | - | - | Resolved | Oct 24, 2013 | - | |
| Oct 1, 2013 | - | Other | No | No | - | - | - | Resolved | Oct 24, 2013 | - | |
| Jul 1, 2013 | - | Other | No | No | - | - | - | Resolved | Oct 24, 2013 | - | |
| Jul 1, 2013 | - | Other | No | No | - | - | - | Resolved | Oct 24, 2013 | - | |
| Jan 1, 2013 | - | MR | No | No | - | TT | - | Resolved | Feb 11, 2013 | - | |
| Jan 1, 2013 | - | MR | No | No | - | TT | - | Resolved | Feb 11, 2013 | - | |
| Jul 1, 2008 | - | Other | No | No | - | - | - | Resolved | Aug 21, 2008 | - | |
| Jul 1, 2008 | - | Other | No | No | - | - | - | Resolved | Aug 21, 2008 | - | |
| Jul 1, 2008 | - | Other | No | No | - | - | - | Resolved | Aug 21, 2008 | - | |
| Oct 1, 2002 | Oct 31, 2002 | MR | No | No | - | 5% of samples | - | Resolved | Oct 31, 2002 | - | |
| Oct 1, 2002 | Oct 31, 2002 | MR | No | No | - | 5% of samples | - | Resolved | Oct 31, 2002 | - | |
| Oct 1, 2002 | Oct 31, 2002 | MR | No | No | - | 5% of samples | - | Resolved | Oct 31, 2002 | - | |
| Oct 1, 2002 | Oct 31, 2002 | MR | No | No | - | 5% of samples | - | Resolved | Oct 31, 2002 | - | |
| Oct 1, 2002 | Oct 31, 2002 | MR | No | No | - | 5% of samples | - | Resolved | Oct 31, 2002 | - | |
| Nov 1, 2001 | Nov 30, 2001 | MR | No | No | - | 5% of samples | - | Resolved | Nov 30, 2001 | - | |
| Nov 1, 2001 | Nov 30, 2001 | MR | No | No | - | 5% of samples | - | Resolved | Nov 30, 2001 | - | |
| Nov 1, 2001 | Nov 30, 2001 | MR | No | No | - | 5% of samples | - | Resolved | Nov 30, 2001 | - | |
| Nov 1, 2001 | Nov 30, 2001 | MR | No | No | - | 5% of samples | - | Resolved | Nov 30, 2001 | - | |
| Nov 1, 2001 | Nov 30, 2001 | MR | No | No | - | 5% of samples | - | Resolved | Nov 30, 2001 | - | |
| Nov 1, 2001 | Nov 30, 2001 | MR | No | No | - | 5% of samples | - | Resolved | Nov 30, 2001 | - | |
| Oct 1, 2001 | Oct 31, 2001 | MR | No | No | - | 5% of samples | - | Resolved | Oct 31, 2001 | - | |
| Oct 1, 2001 | Oct 31, 2001 | MR | No | No | - | 5% of samples | - | Resolved | Oct 31, 2001 | - | |
| Oct 1, 2001 | Oct 31, 2001 | MR | No | No | - | 5% of samples | - | Resolved | Oct 31, 2001 | - | |
| Oct 1, 2001 | Oct 31, 2001 | MR | No | No | - | 5% of samples | - | Resolved | Oct 31, 2001 | - | |
| Oct 1, 2001 | Oct 31, 2001 | MR | No | No | - | 5% of samples | - | Resolved | Oct 31, 2001 | - | |
| Oct 1, 2001 | Oct 31, 2001 | MR | No | No | - | 5% of samples | - | Resolved | Oct 31, 2001 | - | |
| Jan 1, 1999 | Dec 31, 1999 | MR | No | Yes | - | 10 mg/L | - | Resolved | Dec 31, 1999 | - | |
| Jan 1, 1999 | Dec 31, 1999 | MR | No | Yes | - | 10 mg/L | - | Resolved | Dec 31, 1999 | - | |
| Jan 1, 1999 | Dec 31, 1999 | MR | No | Yes | - | 10 mg/L | - | Resolved | Dec 31, 1999 | - | |
| Oct 1, 1997 | Oct 31, 1997 | MR | No | No | - | 5% of samples | - | Resolved | Oct 31, 1997 | - | |
| Jan 1, 1997 | Dec 31, 1997 | MR | No | Yes | - | 10 mg/L | - | Resolved | Dec 31, 1997 | - | |
| Jan 1, 1997 | Dec 31, 1997 | MR | No | Yes | - | 10 mg/L | - | Resolved | Dec 31, 1997 | - | |
| Jan 1, 1997 | - | MR | No | No | - | TT | - | Resolved | Dec 31, 2000 | - | |
| Jul 1, 1994 | Jul 31, 1994 | MR | No | No | - | 5% of samples | - | Resolved | Jul 31, 1994 | - | |
| Jan 1, 1994 | Dec 31, 1994 | MR | No | Yes | - | 10 mg/L | - | Resolved | Dec 31, 1994 | - | |
| Jul 1, 1993 | - | MR | No | No | - | TT | - | Resolved | Nov 27, 1996 | - | |
| Jul 1, 1993 | - | MR | No | No | - | TT | - | Resolved | Nov 27, 1996 | - | |
| Jan 1, 1993 | Dec 31, 1993 | MR | No | Yes | - | 10 mg/L | - | Resolved | Dec 31, 1993 | - | |
| - | - | - | No | No | - | - | - | - | - | - | |
| - | - | - | No | No | - | - | - | - | - | - | |
| - | - | - | 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.