GRASS VALLEY WATER SYSTEM
Oregon - Community Water System - PWSID: OR4100356
System Information
| PWSID | OR4100356 |
| System Name | GRASS VALLEY WATER SYSTEM |
| System Type | Community Water System |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Local |
| EPA Region | 10 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Mar 12, 1979 |
| Last Reported | Mar 25, 2026 |
Location & Contact
| State | Oregon |
| City | GRASS VALLEY |
| ZIP Code | 97029 |
| Address | PO BOX 191 |
| Organization | GRASS VALLEY WATER SYSTEM |
| Phone | 541-333-2434 |
Population & Service
| Population Served | 184 |
| Service Connections | 92 |
Drinking Water Violations (139)
This water system has 139 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, 2022 | - | MR | No | No | - | TT | - | Resolved | Aug 28, 2025 | - | |
| Sep 1, 2011 | Sep 30, 2011 | MR | No | No | - | 5% of samples | - | Resolved | Sep 30, 2011 | - | |
| Sep 1, 2011 | Sep 30, 2011 | MR | No | No | - | 5% of samples | - | Resolved | Sep 30, 2011 | - | |
| Jul 1, 2009 | Jul 31, 2009 | MCL | Yes | No | - | 5% of samples | - | Resolved | Jul 31, 2009 | - | |
| Jul 1, 2009 | Jul 31, 2009 | MCL | Yes | No | - | 5% of samples | - | Resolved | Jul 31, 2009 | - | |
| Jan 1, 2009 | Dec 31, 2009 | MR | No | Yes | - | 10 mg/L | - | Resolved | Dec 31, 2009 | - | |
| Jan 1, 2009 | Dec 31, 2009 | MR | No | Yes | - | 10 mg/L | - | Resolved | Dec 31, 2009 | - | |
| Jul 1, 2007 | Jul 31, 2007 | MR | No | No | - | 5% of samples | - | Resolved | Jul 31, 2007 | - | |
| Jan 1, 2007 | Dec 31, 2007 | MR | No | Yes | - | 10 mg/L | - | Resolved | Dec 31, 2007 | - | |
| May 1, 2005 | May 31, 2005 | MR | No | No | - | 5% of samples | - | Resolved | May 31, 2005 | - | |
| Jan 1, 2005 | - | MR | No | No | - | TT | - | Resolved | Jan 9, 2007 | - | |
| Jan 1, 2005 | Dec 31, 2005 | MR | No | Yes | - | 10 mg/L | - | Resolved | Dec 31, 2005 | - | |
| Sep 1, 2004 | Sep 30, 2004 | MCL | Yes | No | - | 5% of samples | - | Resolved | Sep 30, 2004 | - | |
| Jul 1, 2004 | - | Other | No | No | - | - | - | Resolved | Jun 2, 2010 | - | |
| Jan 1, 2004 | Dec 31, 2004 | MR | No | Yes | - | 10 mg/L | - | Resolved | Dec 31, 2004 | - | |
| Nov 1, 2003 | Nov 30, 2003 | MR | No | No | - | 5% of samples | - | Resolved | Nov 30, 2003 | - | |
| Nov 1, 2003 | Nov 30, 2003 | MR | No | No | - | 5% of samples | - | Resolved | Nov 30, 2003 | - | |
| Sep 1, 2003 | Sep 30, 2003 | MCL | Yes | No | - | 5% of samples | - | Resolved | Sep 30, 2003 | - | |
| Aug 1, 2003 | Aug 31, 2003 | MCL | Yes | No | - | 5% of samples | - | Resolved | Aug 31, 2003 | - | |
| Oct 19, 2001 | - | Other | No | No | - | - | - | Resolved | Jul 9, 2002 | - | |
| Jul 1, 2001 | - | Other | No | No | - | - | - | Resolved | Jul 9, 2002 | - | |
| Sep 1, 2000 | Sep 30, 2000 | MR | No | No | - | 5% of samples | - | Resolved | Sep 30, 2000 | - | |
| Sep 1, 2000 | Sep 30, 2000 | MCL | Yes | No | - | 5% of samples | - | Resolved | Sep 30, 2000 | - | |
| Jul 1, 2000 | - | Other | No | No | - | - | - | Resolved | Jul 9, 2002 | - | |
| Jan 1, 1999 | Dec 31, 2001 | MR | No | Yes | - | 0.004 mg/L | - | Resolved | Dec 31, 2001 | - | |
| Jan 1, 1999 | Dec 31, 2001 | MR | No | Yes | - | 0.0002 mg/L | - | Resolved | Dec 31, 2001 | - | |
| Jan 1, 1999 | Dec 31, 2001 | MR | No | Yes | - | 0.002 mg/L | - | Resolved | Dec 31, 2001 | - | |
| Jan 1, 1999 | Dec 31, 2001 | MR | No | Yes | - | 0.0002 mg/L | - | Resolved | Dec 31, 2001 | - | |
| Jan 1, 1999 | Dec 31, 2001 | MR | No | Yes | - | 0.007 mg/L | - | Resolved | Dec 31, 2001 | - | |
| Jan 1, 1999 | Dec 31, 2001 | MR | No | Yes | - | 0.1 mg/L | - | Resolved | Dec 31, 2001 | - | |
| Jan 1, 1999 | Dec 31, 2001 | MR | No | Yes | - | 0.002 mg/L | - | Resolved | Dec 31, 2001 | - | |
| Jan 1, 1999 | Dec 31, 2001 | MR | No | Yes | - | 0.7 mg/L | - | Resolved | Dec 31, 2001 | - | |
| Jan 1, 1999 | Dec 31, 2001 | MR | No | Yes | - | 0.05 mg/L | - | Resolved | Dec 31, 2001 | - | |
| Jan 1, 1999 | Dec 31, 2001 | MR | No | Yes | - | 0.04 mg/L | - | Resolved | Dec 31, 2001 | - | |
| Jan 1, 1999 | Jan 31, 1999 | MR | No | No | - | 5% of samples | - | Resolved | Jan 31, 1999 | - | |
| Jan 1, 1999 | Dec 31, 2001 | MR | No | Yes | - | 0.006 mg/L | - | Resolved | Dec 31, 2001 | - | |
| Jan 1, 1999 | Jan 31, 1999 | MR | No | No | - | 5% of samples | - | Resolved | Jan 31, 1999 | - | |
| Jan 1, 1999 | Dec 31, 2001 | MR | No | Yes | - | 0.001 mg/L | - | Resolved | Dec 31, 2001 | - | |
| Jan 1, 1999 | Dec 31, 2001 | MR | No | Yes | - | 0.2 mg/L | - | Resolved | Dec 31, 2001 | - | |
| Jan 1, 1999 | Dec 31, 2001 | MR | No | Yes | - | 0.07 mg/L | - | Resolved | Dec 31, 2001 | - | |
| Jan 1, 1999 | Dec 31, 2001 | MR | No | Yes | - | 0.2 mg/L | - | Resolved | Dec 31, 2001 | - | |
| Jan 1, 1999 | Dec 31, 2001 | MR | No | Yes | - | 0.0005 mg/L | - | Resolved | Dec 31, 2001 | - | |
| Jan 1, 1999 | Dec 31, 2001 | MR | No | Yes | - | - | - | Resolved | Dec 31, 2001 | - | |
| Jan 1, 1999 | Dec 31, 2001 | MR | No | Yes | - | 0.02 mg/L | - | Resolved | Dec 31, 2001 | - | |
| Jan 1, 1999 | Dec 31, 2001 | MR | No | Yes | - | 0.00005 mg/L | - | Resolved | Dec 31, 2001 | - | |
| Jan 1, 1999 | Dec 31, 2001 | MR | No | Yes | - | 0.002 mg/L | - | Resolved | Dec 31, 2001 | - | |
| Jan 1, 1999 | Dec 31, 2001 | MR | No | Yes | - | 0.075 mg/L | - | Resolved | Dec 31, 2001 | - | |
| Jan 1, 1999 | Dec 31, 2001 | MR | No | Yes | - | 0.5 mg/L | - | Resolved | Dec 31, 2001 | - | |
| Jan 1, 1999 | Dec 31, 2001 | MR | No | Yes | - | 0.005 mg/L | - | Resolved | Dec 31, 2001 | - | |
| Jan 1, 1999 | Dec 31, 2001 | MR | No | Yes | - | 0.010 mg/L | - | Resolved | Dec 31, 2001 | - |
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.