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 | Mar 20, 2026 |
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 (13)
This water system has 13 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 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2023 | — | |
| Jan 1, 2023 | Dec 31, 2023 | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2023 | — | |
| Jan 1, 2023 | Dec 31, 2023 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2023 | — | |
| Jan 1, 2023 | Dec 31, 2023 | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2023 | — | |
| Aug 1, 2016 | Aug 31, 2016 | TT | Yes | No | — | — | — | Resolved | Aug 14, 2016 | — | |
| Aug 1, 2016 | Aug 31, 2016 | TT | Yes | No | — | — | — | Resolved | Aug 14, 2016 | — | |
| Sep 1, 1992 | Sep 30, 1992 | MCL | Yes | No | — | 5% of samples | — | Resolved | Sep 30, 1992 | — | |
| Jun 1, 1991 | Jun 30, 1991 | TT | Yes | No | — | — | — | Resolved | Jun 30, 1991 | — | |
| — | — | — | No | No | — | — | — | — | — | — | |
| — | — | — | No | No | — | — | — | — | — | — | |
| — | — | — | No | No | — | — | — | — | — | — | |
| — | — | — | 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.