RANCHO SAN JOAQUIN MWC
California - Community Water System - PWSID: CA3500581
System Information
| PWSID | CA3500581 |
| System Name | RANCHO SAN JOAQUIN MWC |
| 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 | Jan 6, 1994 |
| Last Reported | Mar 20, 2026 |
Location & Contact
| State | California |
| City | HOLLISTER |
| ZIP Code | 95024 |
| Address | PO Box 1654 |
| Organization | ROCHA, SUSAN |
| Phone | 408-804-1401 |
Population & Service
| Population Served | 914 |
| Service Connections | 30 |
Drinking Water Violations (43)
This water system has 43 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 17, 2024 | - | RPT | No | No | - | - | - | Unaddressed | - | - | |
| Oct 17, 2024 | - | TT | Yes | No | - | - | - | Unaddressed | - | - | |
| Apr 1, 2024 | - | Other | No | No | - | - | - | Resolved | Oct 7, 2024 | - | |
| Apr 1, 2024 | - | Other | No | No | - | - | - | Resolved | Oct 7, 2024 | - | |
| Jul 1, 2023 | Jun 30, 2024 | MCL | Yes | No | .023 MG/L | 0.010 mg/L | .01 | Archived | Jun 30, 2024 | - | |
| Oct 1, 2022 | Sep 30, 2023 | MCL | Yes | No | .011 MG/L | 0.010 mg/L | .01 | Archived | Sep 30, 2023 | - | |
| Jan 1, 2021 | Dec 31, 2021 | MR | No | Yes | - | 0.060 mg/L | - | Resolved | Dec 31, 2021 | - | |
| Jan 1, 2021 | Dec 31, 2021 | MR | No | Yes | - | 0.060 mg/L | - | Resolved | Dec 31, 2021 | - | |
| Jan 1, 2021 | Dec 31, 2021 | MR | No | Yes | - | 0.080 mg/L | - | Resolved | Dec 31, 2021 | - | |
| Jan 1, 2021 | Dec 31, 2021 | MR | No | Yes | - | 0.080 mg/L | - | Resolved | Dec 31, 2021 | - | |
| Feb 1, 2018 | Feb 28, 2018 | MON | No | Yes | - | - | - | Resolved | Feb 28, 2018 | - | |
| Feb 1, 2018 | Feb 28, 2018 | MON | No | Yes | - | - | - | Resolved | Feb 28, 2018 | - | |
| Oct 1, 2017 | - | MR | No | No | - | TT | - | Resolved | Sep 15, 2018 | - | |
| Oct 1, 2017 | - | MR | No | No | - | TT | - | Resolved | Sep 14, 2018 | - | |
| Oct 1, 2017 | - | MR | No | No | - | TT | - | Resolved | Sep 14, 2018 | - | |
| Oct 1, 2012 | Oct 31, 2012 | MR | No | No | - | 5% of samples | - | Resolved | Oct 31, 2012 | - | |
| Oct 1, 2012 | Oct 31, 2012 | MR | No | No | - | 5% of samples | - | Resolved | Oct 31, 2012 | - | |
| Jul 1, 2012 | - | Other | No | No | - | - | - | Resolved | Aug 5, 2013 | - | |
| Jul 1, 2012 | Jul 31, 2012 | MR | No | No | - | 5% of samples | - | Resolved | Jul 31, 2012 | - | |
| Jul 1, 2012 | - | Other | No | No | - | - | - | Resolved | Aug 5, 2013 | - | |
| Jul 1, 2012 | Jul 31, 2012 | MR | No | No | - | 5% of samples | - | Resolved | Jul 31, 2012 | - | |
| Jul 1, 2012 | Jul 31, 2012 | MR | No | No | - | 5% of samples | - | Resolved | Jul 31, 2012 | - | |
| Apr 1, 2012 | Jun 30, 2012 | MR | No | Yes | - | 10 mg/L | - | Archived | Jun 30, 2012 | - | |
| Nov 1, 2006 | Nov 30, 2006 | MR | No | No | - | 5% of samples | - | Resolved | Nov 30, 2006 | - | |
| Nov 1, 2006 | Nov 30, 2006 | MR | No | No | - | 5% of samples | - | Resolved | Nov 30, 2006 | - | |
| Jan 1, 2005 | Dec 31, 2005 | MR | No | Yes | - | 0.060 mg/L | - | Resolved | Dec 31, 2005 | - | |
| Jan 1, 2005 | Mar 31, 2005 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Mar 31, 2005 | - | |
| Jan 1, 2005 | Dec 31, 2005 | MR | No | Yes | - | 0.080 mg/L | - | Resolved | Dec 31, 2005 | - | |
| Jul 1, 2004 | Sep 30, 2004 | MR | No | Yes | - | 10 mg/L | - | Resolved | Sep 30, 2004 | - | |
| Jul 1, 2004 | Sep 30, 2004 | MR | No | Yes | - | 10 mg/L | - | Resolved | Sep 30, 2004 | - | |
| Aug 1, 1997 | Aug 31, 1997 | MCL | Yes | No | - | 5% of samples | - | Resolved | Aug 31, 1997 | - | |
| Aug 1, 1997 | Aug 31, 1997 | MCL | Yes | No | - | 5% of samples | - | Resolved | Aug 31, 1997 | - | |
| Aug 1, 1997 | Aug 31, 1997 | MCL | Yes | No | - | 5% of samples | - | Resolved | Aug 31, 1997 | - | |
| Aug 1, 1997 | Aug 31, 1997 | MCL | Yes | No | - | 5% of samples | - | Resolved | Aug 31, 1997 | - | |
| Oct 1, 1996 | Oct 31, 1996 | MCL | Yes | No | - | 5% of samples | - | Resolved | Oct 31, 1996 | - | |
| Oct 1, 1996 | Oct 31, 1996 | MCL | Yes | No | - | 5% of samples | - | Resolved | Oct 31, 1996 | - | |
| Oct 1, 1996 | Oct 31, 1996 | MCL | Yes | No | - | 5% of samples | - | Resolved | Oct 31, 1996 | - | |
| Oct 1, 1996 | Oct 31, 1996 | MCL | Yes | No | - | 5% of samples | - | Resolved | Oct 31, 1996 | - | |
| Oct 1, 1996 | Oct 31, 1996 | MCL | Yes | No | - | 5% of samples | - | Resolved | Oct 31, 1996 | - | |
| Aug 1, 1996 | Aug 31, 1996 | MCL | Yes | No | - | 5% of samples | - | Resolved | Aug 31, 1996 | - | |
| Aug 1, 1996 | Aug 31, 1996 | MCL | Yes | No | - | 5% of samples | - | Resolved | Aug 31, 1996 | - | |
| Aug 1, 1996 | Aug 31, 1996 | MCL | Yes | No | - | 5% of samples | - | Resolved | Aug 31, 1996 | - | |
| Aug 1, 1996 | Aug 31, 1996 | MCL | Yes | No | - | 5% of samples | - | Resolved | Aug 31, 1996 | - |
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.