HEMLOCK MUTUAL WATER CO.
California - Community Water System - PWSID: CA1910053
System Information
| PWSID | CA1910053 |
| System Name | HEMLOCK MUTUAL WATER CO. |
| 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 | Dec 15, 1992 |
| Last Reported | Mar 20, 2026 |
Location & Contact
| State | California |
| City | EL MONTE |
| ZIP Code | 91732 |
| Address | 11828 HEMLOCK STREET |
| Organization | BECERRA, BLANCA ESTELLA |
| Phone | 626-422-3516 |
Population & Service
| Population Served | 686 |
| Service Connections | 208 |
Drinking Water Violations (80)
This water system has 80 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 | - | - | |
| Jul 1, 2024 | - | Other | No | No | - | - | - | Resolved | Aug 8, 2025 | - | |
| Jul 1, 2024 | - | Other | No | No | - | - | - | Resolved | Aug 8, 2025 | - | |
| Jan 1, 2024 | - | Other | No | No | - | - | - | Resolved | Aug 8, 2025 | - | |
| Jan 1, 2024 | - | Other | No | No | - | - | - | Resolved | Aug 8, 2025 | - | |
| Oct 1, 2023 | - | Other | No | No | - | - | - | Resolved | Aug 8, 2025 | - | |
| Oct 1, 2023 | - | Other | No | No | - | - | - | Resolved | Aug 8, 2025 | - | |
| Jul 1, 2023 | - | Other | No | No | - | - | - | Resolved | Aug 8, 2025 | - | |
| Jul 1, 2023 | - | Other | No | No | - | - | - | Resolved | Aug 8, 2025 | - | |
| Nov 1, 2012 | Nov 30, 2012 | MR | No | No | - | 5% of samples | - | Resolved | Nov 30, 2012 | - | |
| Nov 1, 2012 | Nov 30, 2012 | MR | No | No | - | 5% of samples | - | Resolved | Nov 30, 2012 | - | |
| Oct 1, 2012 | Oct 31, 2012 | MCL | Yes | No | - | 5% of samples | - | Resolved | Oct 31, 2012 | - | |
| Oct 1, 2012 | - | MR | No | No | - | - | - | Resolved | Dec 10, 2012 | - | |
| Oct 1, 2012 | - | MR | No | No | - | - | - | Resolved | Dec 10, 2012 | - | |
| Oct 1, 2012 | Oct 31, 2012 | MCL | Yes | No | - | 5% of samples | - | Resolved | Oct 31, 2012 | - | |
| Jun 1, 2010 | Jun 30, 2010 | MR | No | No | - | 5% of samples | - | Resolved | Jun 30, 2010 | - | |
| Jun 1, 2010 | Jun 30, 2010 | MR | No | No | - | 5% of samples | - | Resolved | Jun 30, 2010 | - | |
| Oct 1, 2009 | Dec 31, 2009 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Dec 31, 2009 | - | |
| Oct 1, 2009 | Dec 31, 2009 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Dec 31, 2009 | - | |
| Jul 1, 2009 | Sep 30, 2009 | MR | No | No | - | 4.0 mg/L | - | Resolved | Sep 30, 2009 | - | |
| Jul 1, 2009 | Sep 30, 2009 | MR | No | No | - | 4.0 mg/L | - | Resolved | Sep 30, 2009 | - | |
| Jul 1, 2009 | Sep 30, 2009 | MR | No | No | - | 4.0 mg/L | - | Resolved | Sep 30, 2009 | - | |
| Jul 1, 2009 | Sep 30, 2009 | MR | No | No | - | 4.0 mg/L | - | Resolved | Sep 30, 2009 | - | |
| Apr 1, 2009 | Jun 30, 2009 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Jun 30, 2009 | - | |
| Apr 1, 2009 | Jun 30, 2009 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Jun 30, 2009 | - | |
| Jan 30, 2009 | - | MR | No | No | - | TT | - | Resolved | Jul 1, 2010 | - | |
| Jan 30, 2009 | - | MR | No | No | - | TT | - | Resolved | Jul 1, 2010 | - | |
| Jan 1, 2009 | Mar 31, 2009 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Mar 31, 2009 | - | |
| Jan 1, 2009 | Mar 31, 2009 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Mar 31, 2009 | - | |
| Oct 1, 2008 | Oct 31, 2008 | MCL | Yes | No | - | 5% of samples | - | Resolved | Oct 31, 2008 | - | |
| Oct 1, 2008 | Oct 31, 2008 | MCL | Yes | No | - | 5% of samples | - | Resolved | Oct 31, 2008 | - | |
| Oct 1, 2008 | Dec 31, 2008 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Dec 31, 2008 | - | |
| Oct 1, 2008 | Dec 31, 2008 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Dec 31, 2008 | - | |
| Jul 1, 2008 | Sep 30, 2008 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Sep 30, 2008 | - | |
| Jul 1, 2008 | Sep 30, 2008 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Sep 30, 2008 | - | |
| Apr 1, 2008 | Jun 30, 2008 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Jun 30, 2008 | - | |
| Apr 1, 2008 | Jun 30, 2008 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Jun 30, 2008 | - | |
| Jan 1, 2008 | Mar 31, 2008 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Mar 31, 2008 | - | |
| Jan 1, 2008 | Mar 31, 2008 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Mar 31, 2008 | - | |
| Oct 1, 2007 | Dec 31, 2007 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Dec 31, 2007 | - | |
| Oct 1, 2007 | Dec 31, 2007 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Dec 31, 2007 | - | |
| Jul 1, 2007 | Sep 30, 2007 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Sep 30, 2007 | - | |
| Jul 1, 2007 | Sep 30, 2007 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Sep 30, 2007 | - | |
| Apr 1, 2007 | Jun 30, 2007 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Jun 30, 2007 | - | |
| Apr 1, 2007 | Jun 30, 2007 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Jun 30, 2007 | - | |
| Jan 1, 2007 | Mar 31, 2007 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Mar 31, 2007 | - | |
| Jan 1, 2007 | Mar 31, 2007 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Mar 31, 2007 | - | |
| Oct 1, 2006 | Dec 31, 2006 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Dec 31, 2006 | - | |
| Oct 1, 2006 | Dec 31, 2006 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Dec 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.