IMPROVEMENT DISTRICT NO. 1
California - Community Water System - PWSID: CA5400968
System Information
| PWSID | CA5400968 |
| System Name | IMPROVEMENT DISTRICT NO. 1 |
| System Type | Community Water System |
| Water Source | Surface Water |
| Activity Status | Active |
| Owner Type | Local |
| EPA Region | 09 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Mar 22, 1979 |
| Last Reported | Mar 20, 2026 |
Location & Contact
| State | California |
| City | THREE RIVERS |
| ZIP Code | 93271 |
| Address | THREE RIVERS CSD |
| Organization | HOWELL, CINDY |
| Phone | 559-561-3480 |
Population & Service
| Population Served | 200 |
| Service Connections | 80 |
Drinking Water Violations (114)
This water system has 114 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jun 1, 2025 | Jun 30, 2025 | MR | No | Yes | - | 0.060 mg/L | - | Archived | Jun 30, 2025 | - | |
| Jun 1, 2025 | Jun 30, 2025 | MR | No | Yes | - | 0.080 mg/L | - | Archived | Jun 30, 2025 | - | |
| Sep 1, 2019 | Sep 30, 2019 | MON | No | Yes | - | - | - | Resolved | Sep 30, 2019 | - | |
| Sep 1, 2019 | Sep 30, 2019 | MON | No | Yes | - | - | - | Resolved | Sep 30, 2019 | - | |
| Jan 1, 2017 | Dec 31, 2017 | MR | No | No | - | 10 mg/L | - | Resolved | Dec 31, 2017 | - | |
| Jan 1, 2017 | Dec 31, 2017 | MR | No | No | - | 10 mg/L | - | Resolved | Dec 31, 2017 | - | |
| Jan 1, 2017 | Dec 31, 2017 | MR | No | No | - | 10 mg/L | - | Resolved | Dec 31, 2017 | - | |
| Jan 1, 2016 | Dec 31, 2016 | MR | No | No | - | 10 mg/L | - | Resolved | Dec 31, 2016 | - | |
| Jan 1, 2016 | Dec 31, 2016 | MR | No | No | - | 10 mg/L | - | Resolved | Dec 31, 2016 | - | |
| Jan 1, 2015 | Dec 31, 2015 | MR | No | No | - | - | - | Resolved | Dec 31, 2015 | - | |
| Jan 1, 2015 | Dec 31, 2015 | MR | No | No | - | - | - | Resolved | Dec 31, 2015 | - | |
| Oct 1, 2014 | Oct 31, 2014 | MR | No | No | - | 5% of samples | - | Resolved | Oct 31, 2014 | - | |
| Oct 1, 2014 | Oct 31, 2014 | MR | No | No | - | 5% of samples | - | Resolved | Oct 31, 2014 | - | |
| Mar 1, 2014 | Mar 31, 2014 | TT | Yes | No | - | - | - | Resolved | Mar 31, 2014 | - | |
| Mar 1, 2014 | Mar 31, 2014 | TT | Yes | No | - | - | - | Resolved | Mar 31, 2014 | - | |
| Feb 1, 2014 | Feb 28, 2014 | TT | Yes | No | - | - | - | Resolved | Feb 28, 2014 | - | |
| Feb 1, 2014 | Feb 28, 2014 | TT | Yes | No | - | - | - | Resolved | Feb 28, 2014 | - | |
| Jan 1, 2014 | Jan 31, 2014 | TT | Yes | No | - | - | - | Resolved | Jan 31, 2014 | - | |
| Jan 1, 2014 | Jan 31, 2014 | TT | Yes | No | - | - | - | Resolved | Jan 31, 2014 | - | |
| Sep 30, 2013 | - | MR | No | No | - | TT | - | Resolved | Sep 17, 2014 | - | |
| Sep 30, 2013 | - | MR | No | No | - | TT | - | Resolved | Sep 17, 2014 | - | |
| Jan 1, 2013 | Dec 31, 2013 | MR | No | Yes | - | 0.060 mg/L | - | Resolved | Dec 31, 2013 | - | |
| Jan 1, 2013 | Dec 31, 2013 | MR | No | Yes | - | 0.060 mg/L | - | Resolved | Dec 31, 2013 | - | |
| Jan 1, 2013 | Dec 31, 2013 | MR | No | Yes | - | 0.080 mg/L | - | Resolved | Dec 31, 2013 | - | |
| Jan 1, 2013 | Dec 31, 2013 | MR | No | Yes | - | 0.080 mg/L | - | Resolved | Dec 31, 2013 | - | |
| Oct 1, 2012 | - | MR | No | No | - | TT | - | Resolved | Sep 17, 2014 | - | |
| Oct 1, 2012 | - | MR | No | No | - | TT | - | Resolved | Sep 17, 2014 | - | |
| Sep 1, 2012 | Sep 30, 2012 | MR | No | No | - | 5% of samples | - | Resolved | Sep 30, 2012 | - | |
| Sep 1, 2012 | Sep 30, 2012 | MR | No | No | - | 5% of samples | - | Resolved | Sep 30, 2012 | - | |
| Jan 1, 2012 | Dec 31, 2012 | MR | No | No | - | 10 mg/L | - | Resolved | Dec 24, 2012 | - | |
| Jan 1, 2012 | Dec 31, 2012 | MR | No | No | - | 10 mg/L | - | Resolved | Dec 24, 2012 | - | |
| Oct 1, 2011 | - | TT | Yes | No | - | - | - | Resolved | Nov 30, 2015 | - | |
| Oct 1, 2011 | - | TT | Yes | No | - | - | - | Resolved | Nov 30, 2015 | - | |
| Oct 1, 2011 | - | TT | Yes | No | - | - | - | Resolved | Nov 30, 2015 | - | |
| Apr 1, 2011 | Apr 30, 2011 | MCL | Yes | No | - | 5% of samples | - | Resolved | Apr 30, 2011 | - | |
| Apr 1, 2011 | Apr 30, 2011 | MCL | Yes | No | - | 5% of samples | - | Resolved | Apr 30, 2011 | - | |
| Dec 1, 2010 | Dec 31, 2010 | TT | Yes | No | - | - | - | Resolved | Dec 31, 2010 | - | |
| Dec 1, 2010 | Dec 31, 2010 | TT | Yes | No | - | - | - | Resolved | Dec 31, 2010 | - | |
| Aug 1, 2010 | Aug 31, 2010 | TT | Yes | No | - | - | - | Resolved | Aug 31, 2010 | - | |
| Aug 1, 2010 | Aug 31, 2010 | TT | Yes | No | - | - | - | Resolved | Aug 31, 2010 | - | |
| Nov 1, 2008 | Nov 30, 2008 | MR | No | Yes | - | - | - | Resolved | Nov 30, 2008 | - | |
| Nov 1, 2008 | Nov 30, 2008 | MR | No | Yes | - | - | - | Resolved | Nov 30, 2008 | - | |
| Oct 1, 2008 | Oct 31, 2008 | TT | Yes | No | - | - | - | Resolved | Oct 31, 2008 | - | |
| Oct 1, 2008 | Oct 31, 2008 | TT | Yes | No | - | - | - | Resolved | Oct 31, 2008 | - | |
| Oct 1, 2008 | Oct 31, 2008 | TT | Yes | No | - | - | - | Resolved | Oct 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 | - | |
| Jul 1, 2007 | Jul 31, 2007 | TT | Yes | No | - | - | - | Resolved | Jul 31, 2007 | - | |
| Jul 1, 2007 | Jul 31, 2007 | TT | Yes | No | - | - | - | Resolved | Jul 31, 2007 | - | |
| Jul 1, 2007 | Jul 31, 2007 | TT | Yes | No | - | - | - | Resolved | Jul 31, 2007 | - |
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.