NORTHWEST PIPE COMPANY
California - Non-Transient Non-Community - PWSID: CA3901181
System Information
| PWSID | CA3901181 |
| System Name | NORTHWEST PIPE COMPANY |
| System Type | Non-Transient Non-Community |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Private |
| EPA Region | 09 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Nov 30, 1981 |
| Last Reported | Mar 20, 2026 |
Location & Contact
| State | California |
| City | TRACY |
| ZIP Code | 95377 |
| Address | 10100 W LINNE ROAD |
| Organization | ZIA, DAVID |
| Phone | 209-666-8967 |
Population & Service
| Population Served | 82 |
| Service Connections | 3 |
Drinking Water Violations (55)
This water system has 55 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 2, 2025 | - | RPT | No | No | - | - | - | Unaddressed | - | - | |
| Jul 1, 2024 | Jul 31, 2024 | MON | No | Yes | - | - | - | Resolved | Jul 31, 2024 | - | |
| Jul 1, 2024 | Jul 31, 2024 | MON | No | Yes | - | - | - | Resolved | Jul 31, 2024 | - | |
| Jul 1, 2014 | Jul 31, 2014 | MCL | Yes | No | - | 5% of samples | - | Resolved | Jul 31, 2014 | - | |
| Jul 1, 2014 | Jul 31, 2014 | MCL | Yes | No | - | 5% of samples | - | Resolved | Jul 31, 2014 | - | |
| Jun 1, 2014 | Jun 30, 2014 | MCL | Yes | No | - | 5% of samples | - | Resolved | Jun 30, 2014 | - | |
| Jun 1, 2014 | Jun 30, 2014 | MCL | Yes | No | - | 5% of samples | - | Resolved | Jun 30, 2014 | - | |
| May 1, 2014 | May 31, 2014 | MCL | Yes | No | - | 5% of samples | - | Resolved | May 31, 2014 | - | |
| May 1, 2014 | May 31, 2014 | MCL | Yes | No | - | 5% of samples | - | Resolved | May 31, 2014 | - | |
| Dec 1, 2013 | Dec 31, 2013 | MCL | Yes | No | - | 5% of samples | - | Resolved | Dec 31, 2013 | - | |
| Dec 1, 2013 | Dec 31, 2013 | MCL | Yes | No | - | 5% of samples | - | Resolved | Dec 31, 2013 | - | |
| Oct 1, 2013 | Oct 31, 2013 | MCL | Yes | No | - | 5% of samples | - | Resolved | Oct 31, 2013 | - | |
| Oct 1, 2013 | Oct 31, 2013 | MCL | Yes | No | - | 5% of samples | - | Resolved | Oct 31, 2013 | - | |
| Jul 1, 2012 | - | Other | No | No | - | - | - | Resolved | Jul 1, 2012 | - | |
| Jul 1, 2012 | - | Other | No | No | - | - | - | Resolved | Jul 1, 2012 | - | |
| May 1, 2012 | May 31, 2012 | MCL | Yes | No | - | 5% of samples | - | Resolved | May 1, 2012 | - | |
| May 1, 2012 | May 31, 2012 | MCL | Yes | No | - | 5% of samples | - | Resolved | May 1, 2012 | - | |
| Feb 1, 2012 | Feb 29, 2012 | MCL | Yes | No | - | 5% of samples | - | Resolved | Feb 1, 2012 | - | |
| Feb 1, 2012 | Feb 29, 2012 | MCL | Yes | No | - | 5% of samples | - | Resolved | Feb 1, 2012 | - | |
| Nov 1, 2011 | Nov 30, 2011 | MCL | Yes | No | - | 5% of samples | - | Resolved | Nov 1, 2011 | - | |
| Nov 1, 2011 | Nov 30, 2011 | MCL | Yes | No | - | 5% of samples | - | Resolved | Nov 1, 2011 | - | |
| Jul 1, 2011 | - | Other | No | No | - | - | - | Resolved | Jul 1, 2011 | - | |
| Jul 1, 2011 | - | Other | No | No | - | - | - | Resolved | Jul 1, 2011 | - | |
| Feb 1, 2010 | Feb 28, 2010 | MR | No | No | - | 5% of samples | - | Resolved | Feb 28, 2010 | - | |
| Nov 1, 2009 | Nov 30, 2009 | MCL | Yes | No | - | 5% of samples | - | Resolved | Nov 30, 2009 | - | |
| Nov 1, 2009 | Nov 30, 2009 | MCL | Yes | No | - | 5% of samples | - | Resolved | Nov 30, 2009 | - | |
| Oct 1, 2009 | Oct 31, 2009 | MCL | Yes | No | - | 5% of samples | - | Resolved | Oct 31, 2009 | - | |
| Oct 1, 2009 | Oct 31, 2009 | MCL | Yes | No | - | 5% of samples | - | Resolved | Oct 31, 2009 | - | |
| Jul 1, 2009 | - | Other | No | No | - | - | - | Resolved | Jul 1, 2009 | - | |
| Dec 1, 2008 | Dec 31, 2008 | MR | No | No | - | 5% of samples | - | Resolved | Dec 31, 2008 | - | |
| Dec 1, 2008 | Dec 31, 2008 | MR | No | No | - | 5% of samples | - | Resolved | Dec 31, 2008 | - | |
| Aug 1, 2008 | Aug 31, 2008 | MCL | Yes | No | - | 5% of samples | - | Resolved | Aug 31, 2008 | - | |
| Aug 1, 2008 | Aug 31, 2008 | MCL | Yes | No | - | 5% of samples | - | Resolved | Aug 31, 2008 | - | |
| Jul 1, 2008 | - | Other | No | No | - | - | - | Resolved | Jul 1, 2009 | - | |
| Jun 1, 2008 | Jun 30, 2008 | MCL | Yes | No | - | 5% of samples | - | Resolved | Jun 30, 2008 | - | |
| Jun 1, 2008 | Jun 30, 2008 | MCL | Yes | No | - | 5% of samples | - | Resolved | Jun 30, 2008 | - | |
| Jun 1, 2008 | Jun 30, 2008 | MCL | Yes | No | - | 5% of samples | - | Resolved | Jun 30, 2008 | - | |
| Aug 1, 2007 | Aug 31, 2007 | MR | No | No | - | 5% of samples | - | Resolved | Aug 31, 2007 | - | |
| Aug 1, 2007 | Aug 31, 2007 | MR | No | No | - | 5% of samples | - | Resolved | Aug 31, 2007 | - | |
| Jul 1, 2007 | Jul 31, 2007 | MR | No | No | - | 5% of samples | - | Resolved | Jul 31, 2007 | - | |
| Jul 1, 2007 | Jul 31, 2007 | MR | No | No | - | 5% of samples | - | Resolved | Jul 31, 2007 | - | |
| Feb 1, 2007 | Feb 28, 2007 | MR | No | No | - | 5% of samples | - | Resolved | Feb 28, 2007 | - | |
| Feb 1, 2007 | Feb 28, 2007 | MR | No | No | - | 5% of samples | - | Resolved | Feb 28, 2007 | - | |
| Jan 1, 2007 | Jan 31, 2007 | MR | No | No | - | 5% of samples | - | Resolved | Jan 31, 2007 | - | |
| Jan 1, 2007 | Jan 31, 2007 | MCL | Yes | No | - | 5% of samples | - | Resolved | Jan 31, 2007 | - | |
| Jan 1, 2007 | Jan 31, 2007 | MCL | Yes | No | - | 5% of samples | - | Resolved | Jan 31, 2007 | - | |
| Nov 1, 2006 | Nov 30, 2006 | MCL | Yes | No | - | 5% of samples | - | Resolved | Nov 30, 2006 | - | |
| Nov 1, 2006 | Nov 30, 2006 | MCL | Yes | No | - | 5% of samples | - | Resolved | Nov 30, 2006 | - | |
| Oct 1, 2006 | Oct 31, 2006 | MCL | Yes | No | - | 5% of samples | - | Resolved | Oct 31, 2006 | - | |
| Oct 1, 2006 | Oct 31, 2006 | MCL | Yes | No | - | 5% of samples | - | Resolved | Oct 31, 2006 | - |
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.