MADRONE MUTUAL WATER COMPANY
California - Community Water System - PWSID: CA4900513
System Information
| PWSID | CA4900513 |
| System Name | MADRONE MUTUAL WATER COMPANY |
| System Type | Community Water System |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Private |
| EPA Region | 09 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Mar 22, 1979 |
| Last Reported | Mar 20, 2026 |
Location & Contact
| State | California |
| City | COTATI |
| ZIP Code | 94931 |
| Address | 7729 ISABEL DRIVE |
| Organization | BROOKS, CHRISTOPHER |
| Phone | 707-332-0670 |
Population & Service
| Population Served | 76 |
| Service Connections | 23 |
Drinking Water Violations (27)
This water system has 27 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| May 1, 2015 | May 31, 2015 | MCL | Yes | No | - | 5% of samples | - | Resolved | May 31, 2015 | - | |
| May 1, 2015 | May 31, 2015 | MCL | Yes | No | - | 5% of samples | - | Resolved | May 31, 2015 | - | |
| Feb 1, 2015 | Feb 28, 2015 | MCL | Yes | No | - | 5% of samples | - | Resolved | Feb 28, 2015 | - | |
| Feb 1, 2015 | Feb 28, 2015 | MCL | Yes | No | - | 5% of samples | - | Resolved | Feb 28, 2015 | - | |
| Oct 1, 2014 | Oct 31, 2014 | MCL | Yes | No | - | 5% of samples | - | Resolved | Oct 31, 2014 | - | |
| Oct 1, 2014 | Oct 31, 2014 | MCL | Yes | No | - | 5% of samples | - | Resolved | Oct 31, 2014 | - | |
| 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 | - | |
| Dec 1, 2010 | Dec 31, 2010 | MCL | Yes | No | - | 5% of samples | - | Resolved | Dec 31, 2010 | - | |
| Dec 1, 2010 | Dec 31, 2010 | MCL | Yes | No | - | 5% of samples | - | Resolved | Dec 31, 2010 | - | |
| Apr 1, 2010 | Apr 30, 2010 | MCL | Yes | No | - | 5% of samples | - | Resolved | Apr 30, 2010 | - | |
| Apr 1, 2010 | Apr 30, 2010 | MCL | Yes | No | - | 5% of samples | - | Resolved | Apr 30, 2010 | - | |
| Sep 1, 2009 | Sep 30, 2009 | MCL | Yes | No | - | 5% of samples | - | Resolved | Sep 30, 2009 | - | |
| Sep 1, 2009 | Sep 30, 2009 | MCL | Yes | No | - | 5% of samples | - | Resolved | Sep 30, 2009 | - | |
| Aug 1, 2009 | Aug 31, 2009 | MCL | Yes | No | - | 5% of samples | - | Resolved | Aug 31, 2009 | - | |
| Aug 1, 2009 | Aug 31, 2009 | MCL | Yes | No | - | 5% of samples | - | Resolved | Aug 31, 2009 | - | |
| Aug 1, 2006 | Aug 31, 2006 | MCL | Yes | No | - | 5% of samples | - | Resolved | Aug 21, 1998 | - | |
| Jul 1, 1998 | Jul 31, 1998 | MR | No | No | - | 5% of samples | - | Resolved | Jul 31, 1998 | - | |
| Jul 1, 1998 | Jul 31, 1998 | MR | No | No | - | 5% of samples | - | Resolved | Jul 31, 1998 | - | |
| Sep 1, 1984 | Sep 30, 1984 | Other | No | No | - | - | - | Archived | Sep 30, 1984 | - | |
| Aug 1, 1984 | Aug 31, 1984 | Other | No | No | - | - | - | Archived | Aug 31, 1984 | - | |
| Jul 1, 1984 | Jul 31, 1984 | Other | No | No | - | - | - | Archived | Jul 31, 1984 | - | |
| Nov 1, 1982 | Nov 30, 1982 | Other | No | No | - | - | - | Archived | Nov 30, 1982 | - | |
| Oct 1, 1982 | Oct 31, 1982 | Other | No | No | - | - | - | Archived | Oct 31, 1982 | - | |
| Oct 1, 1981 | Sep 30, 1982 | MR | No | Yes | - | 15 pCi/L | - | Archived | Sep 30, 1982 | - | |
| Oct 30, 1980 | Oct 29, 1981 | MR | No | Yes | - | 15 pCi/L | - | Archived | Oct 29, 1981 | - | |
| - | - | - | 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.