MOSSYROCK PUBLIC UTILITY CITY OF
Washington — Community Water System — PWSID: WA5356350
System Information
| PWSID | WA5356350 |
| System Name | MOSSYROCK PUBLIC UTILITY CITY OF |
| System Type | Community Water System |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Local |
| EPA Region | 10 |
| Serves School | No |
| Wholesaler | Yes |
| First Reported | Feb 7, 1981 |
| Last Reported | Mar 26, 2026 |
Location & Contact
| State | Washington |
| City | Mossyrock |
| ZIP Code | 98564 |
| Address | PO Box 477 |
| Organization | MOSSYROCK PUBLIC UTILITY CITY OF |
| Phone | — |
Population & Service
| Population Served | 1,553 |
| Service Connections | 532 |
Drinking Water Violations (52)
This water system has 52 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, 2025 | — | Other | No | No | — | — | — | Resolved | Aug 29, 2025 | — | |
| Jul 1, 2024 | — | Other | No | No | — | — | — | Resolved | Feb 19, 2025 | — | |
| Jul 1, 2023 | — | Other | No | No | — | — | — | Resolved | Sep 29, 2023 | — | |
| Jul 1, 2016 | — | Other | No | No | — | — | — | Resolved | Dec 5, 2016 | — | |
| Feb 1, 2016 | Feb 29, 2016 | MR | No | No | — | 5% of samples | — | Resolved | Feb 29, 2016 | — | |
| Jan 1, 2015 | Dec 31, 2015 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2015 | — | |
| Jan 1, 2015 | Dec 31, 2015 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2015 | — | |
| Nov 1, 2014 | Nov 30, 2014 | MR | No | No | — | 5% of samples | — | Resolved | Nov 30, 2014 | — | |
| Aug 1, 2014 | Aug 31, 2014 | MR | No | No | — | 5% of samples | — | Resolved | Aug 31, 2014 | — | |
| Jan 1, 2014 | Dec 31, 2014 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2014 | — | |
| Jan 1, 2014 | Dec 31, 2014 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2014 | — | |
| Jan 1, 2013 | Dec 31, 2013 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2013 | — | |
| Jan 1, 2013 | Dec 31, 2013 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2013 | — | |
| Jul 1, 2011 | — | Other | No | No | — | — | — | Resolved | Nov 2, 2011 | — | |
| Jul 1, 2010 | — | Other | No | No | — | — | — | Resolved | Oct 26, 2010 | — | |
| Jan 1, 2008 | Dec 31, 2008 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2008 | — | |
| Jan 1, 2008 | Dec 31, 2008 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2008 | — | |
| Jan 1, 2008 | Dec 31, 2008 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2008 | — | |
| Jan 1, 2008 | Dec 31, 2008 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2008 | — | |
| Jan 1, 2008 | Dec 31, 2008 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2008 | — | |
| Jan 1, 2008 | Dec 31, 2008 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2008 | — | |
| Jan 1, 2008 | Dec 31, 2008 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2008 | — | |
| Jan 1, 2008 | Dec 31, 2008 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2008 | — | |
| Jan 1, 2008 | Dec 31, 2008 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2008 | — | |
| Jan 1, 2008 | Dec 31, 2008 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2008 | — | |
| Jan 1, 2008 | Dec 31, 2008 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2008 | — | |
| Jan 1, 2008 | Dec 31, 2008 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2008 | — | |
| Jan 1, 2008 | Dec 31, 2008 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2008 | — | |
| Jan 1, 2008 | Dec 31, 2008 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2008 | — | |
| Jun 1, 2005 | Jun 30, 2005 | MR | No | No | — | 5% of samples | — | Archived | Jun 30, 2005 | — | |
| Oct 1, 2004 | Oct 31, 2004 | MR | No | No | — | 5% of samples | — | Archived | Oct 31, 2004 | — | |
| Oct 19, 1999 | Dec 31, 1999 | Other | No | Yes | — | — | — | Resolved | Dec 31, 1999 | — | |
| Jan 1, 1999 | Jan 1, 2000 | MR | No | No | — | TT | — | Resolved | Jan 1, 2000 | — | |
| Apr 1, 1996 | Apr 30, 1996 | MCL | Yes | No | — | 5% of samples | — | Archived | Apr 30, 1996 | — | |
| Jun 1, 1995 | Jun 30, 1995 | MR | No | Yes | — | 5% of samples | — | Archived | Jun 30, 1995 | — | |
| Apr 1, 1995 | Apr 30, 1995 | MR | No | Yes | — | 5% of samples | — | Archived | Apr 30, 1995 | — | |
| Sep 1, 1993 | Sep 30, 1993 | MR | No | Yes | — | 5% of samples | — | Archived | Sep 30, 1993 | — | |
| Sep 1, 1993 | Sep 30, 1993 | MR | No | Yes | — | 5% of samples | — | Archived | Sep 30, 1993 | — | |
| Apr 1, 1993 | Apr 30, 1993 | MCL | Yes | No | — | 5% of samples | — | Archived | Apr 30, 1993 | — | |
| Apr 1, 1993 | Apr 30, 1993 | MCL | Yes | No | — | 5% of samples | — | Archived | Apr 30, 1993 | — | |
| Nov 1, 1992 | Nov 30, 1992 | MR | No | Yes | — | 5% of samples | — | Archived | Nov 30, 1992 | — | |
| Nov 1, 1992 | Nov 30, 1992 | MR | No | Yes | — | 5% of samples | — | Archived | Nov 30, 1992 | — | |
| Oct 1, 1979 | Oct 31, 1979 | MR | No | No | — | 15 pCi/L | — | Archived | Oct 31, 1979 | — | |
| Oct 1, 1979 | Oct 31, 1979 | MR | No | No | — | 0.005 mg/L | — | Archived | Oct 31, 1979 | — | |
| Oct 1, 1979 | Oct 31, 1979 | MR | No | No | — | 10 mg/L | — | Archived | Oct 31, 1979 | — | |
| Oct 1, 1979 | Oct 31, 1979 | MR | No | No | — | 0.002 mg/L | — | Archived | Oct 31, 1979 | — | |
| Oct 1, 1979 | Oct 31, 1979 | MR | No | No | — | 4.0 mg/L | — | Archived | Oct 31, 1979 | — | |
| Oct 1, 1979 | Oct 31, 1979 | MR | No | No | — | 0.010 mg/L | — | Archived | Oct 31, 1979 | — | |
| Oct 1, 1979 | Oct 31, 1979 | MR | No | No | — | 0.05 mg/L | — | Archived | Oct 31, 1979 | — | |
| Oct 1, 1979 | Oct 31, 1979 | MR | No | No | — | 2 mg/L | — | Archived | Oct 31, 1979 | — |
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.