U.S. GYPSUM CO
California - Non-Transient Non-Community - PWSID: CA1300517
System Information
| PWSID | CA1300517 |
| System Name | U.S. GYPSUM CO |
| System Type | Non-Transient Non-Community |
| 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 | PLASTER CITY |
| ZIP Code | 92269 |
| Address | 3810 W. Evan Hewes Hwy. |
| Organization | MURPHY, DONALD R. |
| Phone | 760-455-8259 |
Population & Service
| Population Served | 280 |
| Service Connections | 1 |
Drinking Water Violations (22)
This water system has 22 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 | - | - | |
| Jan 1, 2022 | Dec 31, 2022 | MR | No | Yes | - | 10 mg/L | - | Resolved | Dec 29, 2022 | - | |
| Jan 1, 2022 | Dec 31, 2022 | MR | No | Yes | - | 10 mg/L | - | Resolved | Dec 29, 2022 | - | |
| Jan 1, 2022 | Dec 31, 2022 | MR | No | No | - | 0.060 mg/L | - | Resolved | Dec 29, 2022 | - | |
| Jan 1, 2022 | Dec 31, 2022 | MR | No | No | - | 0.080 mg/L | - | Resolved | Dec 29, 2022 | - | |
| Jan 1, 2022 | Dec 31, 2022 | MR | No | No | - | 0.080 mg/L | - | Resolved | Dec 29, 2022 | - | |
| Jan 1, 2022 | Dec 31, 2022 | MR | No | No | - | 0.060 mg/L | - | Resolved | Dec 29, 2022 | - | |
| Jan 31, 2011 | Mar 31, 2011 | MR | No | Yes | - | - | - | Resolved | Mar 31, 2011 | - | |
| Aug 31, 2010 | Mar 31, 2011 | MR | No | No | - | 0.080 mg/L | - | Resolved | Mar 31, 2011 | - | |
| Nov 1, 2000 | Nov 30, 2000 | MR | No | No | - | 5% of samples | - | Resolved | Nov 30, 2000 | - | |
| Nov 1, 2000 | Nov 30, 2000 | MR | No | No | - | 5% of samples | - | Resolved | Nov 30, 2000 | - | |
| Oct 1, 1998 | Oct 31, 1998 | MR | No | No | - | 5% of samples | - | Resolved | Oct 31, 1998 | - | |
| Oct 1, 1998 | Oct 31, 1998 | MR | No | No | - | 5% of samples | - | Resolved | Oct 31, 1998 | - | |
| Feb 1, 1998 | Feb 28, 1998 | MR | No | No | - | 5% of samples | - | Resolved | Feb 28, 1998 | - | |
| Feb 1, 1998 | Feb 28, 1998 | MR | No | No | - | 5% of samples | - | Resolved | Feb 28, 1998 | - | |
| Jul 1, 1993 | - | MR | No | No | - | TT | - | Resolved | Sep 30, 2005 | - | |
| Sep 1, 1983 | Sep 30, 1983 | Other | No | No | - | - | - | Archived | Sep 30, 1983 | - | |
| 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 | - | - | - | - | - | - | |
| - | - | - | 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.