SOUTH MESA WC
California — Community Water System — PWSID: CA3310017
System Information
| PWSID | CA3310017 |
| System Name | SOUTH MESA WC |
| 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 | Nov 17, 2025 |
Location & Contact
| State | California |
| City | CALIMESA |
| ZIP Code | 92320 |
| Address | P.O. BOX 458 |
| Organization | ARMSTRONG, DAVID |
| Phone | 909-795-2401 |
Population & Service
| Population Served | 10,108 |
| Service Connections | 3,108 |
Drinking Water Violations (11)
This water system has 11 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 1, 2014 | Sep 30, 2014 | Fluoride | MCL | Yes | No | 2.1 MG/L | 4.0 mg/L | 2 | Resolved | Sep 30, 2014 | Inorganic Chemicals |
| Jul 1, 2014 | Sep 30, 2014 | Fluoride | MCL | Yes | No | 2.1 MG/L | 4.0 mg/L | 2 | Resolved | Sep 30, 2014 | Inorganic Chemicals |
| Apr 1, 2014 | Jun 30, 2014 | Fluoride | MCL | Yes | No | 2.1 MG/L | 4.0 mg/L | 2 | Resolved | Jun 30, 2014 | Inorganic Chemicals |
| Apr 1, 2014 | Jun 30, 2014 | Fluoride | MCL | Yes | No | 2.1 MG/L | 4.0 mg/L | 2 | Resolved | Jun 30, 2014 | Inorganic Chemicals |
| Oct 1, 2013 | — | Lead and Copper Rule | MR | No | No | — | TT | — | Resolved | Oct 23, 2013 | Lead and Copper Rule |
| Oct 1, 2013 | — | Lead and Copper Rule | MR | No | No | — | TT | — | Resolved | Oct 23, 2013 | Lead and Copper Rule |
| Apr 1, 2010 | Dec 31, 2010 | Fluoride | MR | No | No | — | 4.0 mg/L | — | Resolved | Dec 31, 2010 | Inorganic Chemicals |
| Apr 1, 2010 | Dec 31, 2010 | Fluoride | MR | No | No | — | 4.0 mg/L | — | Resolved | Dec 31, 2010 | Inorganic Chemicals |
| Jan 1, 2009 | Dec 31, 2009 | Total Haloacetic Acids (HAA5) | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2009 | Stage 1 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2009 | Dec 31, 2009 | Total Haloacetic Acids (HAA5) | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2009 | Stage 1 Disinfectants and Disinfection Byproducts Rule |
| Nov 1, 1989 | Nov 30, 1989 | Other | No | No | — | — | — | Archived | Nov 30, 1989 | Miscellaneous Other Rules |
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.