Grindstone Rancheria
California - Community Water System - PWSID: 090605004
System Information
| PWSID | 090605004 |
| System Name | Grindstone Rancheria |
| System Type | Community Water System |
| Water Source | Surface Water |
| Activity Status | Active |
| Owner Type | Native American |
| EPA Region | 09 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Feb 2, 1984 |
| Last Reported | Jun 30, 2026 |
Location & Contact
| State | California |
| City | Elk Creek |
| ZIP Code | 95939 |
| Address | P.O. Box 63 |
| Organization | Grindstone Rancheria |
| Phone | 5309685365 |
Population & Service
| Population Served | 150 |
| Service Connections | 58 |
Drinking Water Violations (1,224)
This water system has 1,224 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Mar 1, 2026 | Mar 31, 2026 | MR | No | Yes | - | - | - | Archived | Mar 31, 2026 | - | |
| Feb 1, 2026 | Feb 28, 2026 | MR | No | Yes | - | - | - | Archived | Feb 28, 2026 | - | |
| Jan 1, 2026 | Jan 31, 2026 | MR | No | Yes | - | - | - | Archived | Jan 31, 2026 | - | |
| Dec 1, 2025 | Dec 31, 2025 | MR | No | Yes | - | - | - | Archived | Dec 31, 2025 | - | |
| Nov 1, 2025 | Nov 30, 2025 | MR | No | Yes | - | - | - | Archived | Nov 30, 2025 | - | |
| Oct 1, 2025 | Oct 31, 2025 | MR | No | Yes | - | - | - | Archived | Oct 31, 2025 | - | |
| Sep 1, 2025 | Sep 30, 2025 | MR | No | Yes | - | - | - | Archived | Sep 30, 2025 | - | |
| Aug 1, 2025 | Aug 31, 2025 | MR | No | Yes | - | - | - | Archived | Aug 31, 2025 | - | |
| Jul 1, 2025 | Jul 31, 2025 | MR | No | Yes | - | - | - | Archived | Jul 31, 2025 | - | |
| Jul 1, 2025 | Jul 31, 2025 | MR | No | Yes | - | - | - | Archived | Jul 31, 2025 | - | |
| Jun 1, 2025 | Jun 30, 2025 | MR | No | Yes | - | - | - | Archived | Jun 30, 2025 | - | |
| May 1, 2025 | May 31, 2025 | MR | No | Yes | - | - | - | Archived | May 31, 2025 | - | |
| May 1, 2025 | May 31, 2025 | MR | No | Yes | - | - | - | Archived | May 31, 2025 | - | |
| May 1, 2025 | May 31, 2025 | MR | No | Yes | - | - | - | Archived | May 31, 2025 | - | |
| Apr 1, 2025 | Apr 30, 2025 | MR | No | Yes | - | - | - | Archived | Apr 30, 2025 | - | |
| Mar 1, 2025 | Mar 31, 2025 | MR | No | Yes | - | - | - | Archived | Mar 31, 2025 | - | |
| Mar 1, 2025 | Mar 31, 2025 | MR | No | Yes | - | - | - | Archived | Mar 31, 2025 | - | |
| Mar 1, 2025 | Mar 31, 2025 | MR | No | Yes | - | - | - | Archived | Mar 31, 2025 | - | |
| Mar 1, 2025 | Mar 31, 2025 | MR | No | Yes | - | - | - | Archived | Mar 31, 2025 | - | |
| Mar 1, 2025 | Mar 31, 2025 | MON | No | Yes | - | - | - | Resolved | Mar 31, 2025 | - | |
| Feb 1, 2025 | Feb 28, 2025 | MR | No | Yes | - | - | - | Archived | Feb 28, 2025 | - | |
| Feb 1, 2025 | Feb 28, 2025 | MON | No | Yes | - | - | - | Resolved | Feb 28, 2025 | - | |
| Jan 1, 2025 | Jan 31, 2025 | MR | No | Yes | - | - | - | Archived | Jan 31, 2025 | - | |
| Jan 1, 2025 | Mar 31, 2025 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Mar 31, 2025 | - | |
| Jan 1, 2025 | Jan 31, 2025 | MON | No | Yes | - | - | - | Resolved | Jan 31, 2025 | - | |
| Nov 1, 2024 | Nov 30, 2024 | MON | No | Yes | - | - | - | Resolved | Nov 30, 2024 | - | |
| Nov 1, 2024 | Nov 30, 2024 | MR | No | Yes | - | - | - | Archived | Nov 30, 2024 | - | |
| Nov 1, 2024 | Nov 30, 2024 | MON | No | Yes | - | - | - | Resolved | Nov 30, 2024 | - | |
| Oct 1, 2024 | Oct 31, 2024 | MON | No | Yes | - | - | - | Resolved | Oct 31, 2024 | - | |
| Oct 1, 2024 | Dec 31, 2024 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Dec 31, 2024 | - | |
| Oct 1, 2024 | Oct 31, 2024 | MR | No | Yes | - | - | - | Archived | Oct 31, 2024 | - | |
| Oct 1, 2024 | Oct 31, 2024 | MON | No | Yes | - | - | - | Resolved | Oct 31, 2024 | - | |
| Oct 1, 2024 | Dec 31, 2024 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Dec 31, 2024 | - | |
| Oct 1, 2024 | Dec 31, 2024 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Dec 31, 2024 | - | |
| Oct 1, 2024 | Oct 31, 2024 | MON | No | Yes | - | - | - | Resolved | Oct 31, 2024 | - | |
| Sep 1, 2024 | - | Other | No | No | - | - | - | Resolved | May 2, 2025 | - | |
| Sep 1, 2024 | Sep 30, 2024 | MON | No | Yes | - | - | - | Resolved | Sep 30, 2024 | - | |
| Sep 1, 2024 | Sep 30, 2024 | MON | No | Yes | - | - | - | Resolved | Sep 30, 2024 | - | |
| Sep 1, 2024 | Sep 30, 2024 | MR | No | Yes | - | - | - | Archived | Sep 30, 2024 | - | |
| Sep 1, 2024 | - | Other | No | No | - | - | - | Resolved | May 2, 2025 | - | |
| Aug 1, 2024 | - | Other | No | No | - | - | - | Resolved | May 2, 2025 | - | |
| Aug 1, 2024 | Aug 31, 2024 | MON | No | Yes | - | - | - | Resolved | Aug 31, 2024 | - | |
| Aug 1, 2024 | Aug 31, 2024 | MR | No | Yes | - | - | - | Archived | Aug 31, 2024 | - | |
| Aug 1, 2024 | Aug 31, 2024 | MON | No | Yes | - | - | - | Resolved | Aug 31, 2024 | - | |
| Aug 1, 2024 | - | Other | No | No | - | - | - | Resolved | May 2, 2025 | - | |
| Jul 1, 2024 | - | Other | No | No | - | - | - | Resolved | May 2, 2025 | - | |
| Jul 1, 2024 | Jul 31, 2024 | MON | No | Yes | - | - | - | Resolved | Jul 31, 2024 | - | |
| Jul 1, 2024 | Sep 30, 2024 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Sep 30, 2024 | - | |
| Jul 1, 2024 | Sep 30, 2024 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Sep 30, 2024 | - | |
| Jul 1, 2024 | Jul 31, 2024 | MON | No | Yes | - | - | - | Resolved | Jul 31, 2024 | - |
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.