MAMMOTH CWD
California — Community Water System — PWSID: CA2610001
System Information
| PWSID | CA2610001 |
| System Name | MAMMOTH CWD |
| System Type | Community Water System |
| Water Source | Surface Water |
| Activity Status | Active |
| Owner Type | Local |
| EPA Region | 09 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Mar 22, 1979 |
| Last Reported | Nov 17, 2025 |
Location & Contact
| State | California |
| City | MAMMOTH LAKES |
| ZIP Code | 93546 |
| Address | P.O. BOX 597 |
| Organization | BUSBY, MARK |
| Phone | 760-934-2596 |
Population & Service
| Population Served | 8,234 |
| Service Connections | 3,818 |
Drinking Water Violations (10)
This water system has 10 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan 1, 2023 | Dec 31, 2023 | TTHM | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2023 | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2023 | Dec 31, 2023 | TTHM | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2023 | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2023 | Dec 31, 2023 | Total Haloacetic Acids (HAA5) | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2023 | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2023 | Dec 31, 2023 | Total Haloacetic Acids (HAA5) | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2023 | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| Aug 1, 2016 | Aug 31, 2016 | Surface Water Treatment Rule | TT | Yes | No | — | — | — | Resolved | Aug 14, 2016 | Surface Water Treatment Rule |
| Aug 1, 2016 | Aug 31, 2016 | Surface Water Treatment Rule | TT | Yes | No | — | — | — | Resolved | Aug 14, 2016 | Surface Water Treatment Rule |
| Sep 1, 1992 | Sep 30, 1992 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Sep 30, 1992 | Total Coliform Rule |
| Jun 1, 1991 | Jun 30, 1991 | Surface Water Treatment Rule | TT | Yes | No | — | — | — | Resolved | Jun 30, 1991 | Surface Water Treatment Rule |
| — | — | — | 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.