Sierra Linda Mutual Water Co
PWSID: CA2000506
This system currently has unresolved violations for: 5200. These violations mean contaminant levels exceeded EPA limits or required treatment was not performed.
This system has more violations on record than 98% of water systems in California.
Violation trend: 14.8 per year over the last 5 years, up from 4.2 per year in the previous 5.
System Details
| Population Served | 200 |
| Service Connections | 89 |
| Water Source | Groundwater |
| System Type | Community Water System |
| Owner | Private |
| Status | Active |
| City | North Fork |
| EPA ZIP on File | 93643 |
Lead & Copper Testing
| Contaminant | Level | EPA Action Level | Status |
|---|---|---|---|
| Lead (90th percentile) | 0.0061 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0050 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0031 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0022 mg/L | 0.015 mg/L | Below Action Level |
2 Active Violations
| Contaminant | Violation | Date | Health-Based | Status |
|---|---|---|---|---|
| 5200 | TT | 2024-10-17 | Yes | Open |
| 5200 | RPT | 2024-10-17 | Open |
Violation History (98 total)
| Contaminant | Violation | Date | Health-Based | Status |
|---|---|---|---|---|
| 1005 | MCL Measured: 0.0240 MG/L (limit: 0.0100 MG/L) | 2025-04-01 | Yes | Acknowledged |
| 4006 | MCL Measured: 350.00 PCI/L (limit: 20.00 PCI/L) | 2025-04-01 | Yes | Acknowledged |
| 1028 | MCL Measured: 2.45 MG/L (limit: 0.3000 MG/L) | 2025-04-01 | Yes | Acknowledged |
| 1032 | MCL Measured: 0.1900 MG/L (limit: 0.0500 MG/L) | 2025-04-01 | Yes | Acknowledged |
| 4109 | MCL Measured: 281.34 PCI/L (limit: 15.00 PCI/L) | 2025-04-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0240 MG/L (limit: 0.0100 MG/L) | 2025-01-01 | Yes | Acknowledged |
| 4006 | MCL Measured: 423.33 PCI/L (limit: 20.00 PCI/L) | 2025-01-01 | Yes | Acknowledged |
| 4109 | MCL Measured: 335.59 PCI/L (limit: 15.00 PCI/L) | 2025-01-01 | Yes | Acknowledged |
| 1028 | MCL Measured: 0.8930 MG/L (limit: 0.3000 MG/L) | 2025-01-01 | Yes | Acknowledged |
| 1032 | MCL Measured: 1.75 MG/L (limit: 0.0500 MG/L) | 2025-01-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0198 UG/L (limit: 0.0100 UG/L) | 2024-10-01 | Yes | Acknowledged |
| 4006 | MCL Measured: 70.00 PCI/L (limit: 20.00 PCI/L) | 2024-10-01 | Yes | Acknowledged |
| 4109 | MCL Measured: 89.47 PCI/L (limit: 15.00 PCI/L) | 2024-10-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 21.12 UG/L (limit: 10.00 UG/L) | 2024-04-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 21.12 UG/L (limit: 10.00 UG/L) | 2024-04-01 | Yes | Acknowledged |
| 4006 | MCL Measured: 327.50 PCI/L (limit: 20.00 PCI/L) | 2024-04-01 | Yes | Acknowledged |
| 4006 | MCL Measured: 327.50 PCI/L (limit: 20.00 PCI/L) | 2024-04-01 | Yes | Acknowledged |
| 4109 | MCL Measured: 275.25 PCI/L (limit: 15.00 PCI/L) | 2024-04-01 | Yes | Acknowledged |
| 4109 | MCL Measured: 275.25 PCI/L (limit: 15.00 PCI/L) | 2024-04-01 | Yes | Acknowledged |
| 1028 | MCL Measured: 2475.00 UG/L (limit: 300.00 UG/L) | 2024-04-01 | Yes | Acknowledged |
| 1032 | MCL Measured: 167.50 UG/L (limit: 50.00 UG/L) | 2024-04-01 | Yes | Acknowledged |
| 4109 | MCL Measured: 375.00 PCI/L (limit: 15.00 PCI/L) | 2024-04-01 | Yes | Acknowledged |
| 4109 | MCL Measured: 375.00 PCI/L (limit: 15.00 PCI/L) | 2024-04-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 29.00 UG/L (limit: 10.00 UG/L) | 2024-01-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 29.00 UG/L (limit: 10.00 UG/L) | 2024-01-01 | Yes | Acknowledged |
| 4006 | MCL Measured: 235.00 PCI/L (limit: 20.00 PCI/L) | 2024-01-01 | Yes | Acknowledged |
| 4006 | MCL Measured: 235.00 PCI/L (limit: 20.00 PCI/L) | 2024-01-01 | Yes | Acknowledged |
| 4109 | MCL Measured: 219.00 PCI/L (limit: 15.00 PCI/L) | 2024-01-01 | Yes | Acknowledged |
| 4109 | MCL Measured: 219.00 PCI/L (limit: 15.00 PCI/L) | 2024-01-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0302 MG/L (limit: 0.0100 MG/L) | 2023-10-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0302 MG/L (limit: 0.0100 MG/L) | 2023-10-01 | Yes | Acknowledged |
| 4006 | MCL Measured: 207.50 PCI/L (limit: 20.00 PCI/L) | 2023-10-01 | Yes | Acknowledged |
| 4006 | MCL Measured: 207.50 PCI/L (limit: 20.00 PCI/L) | 2023-10-01 | Yes | Acknowledged |
| 4109 | MCL Measured: 148.00 PCI/L (limit: 15.00 PCI/L) | 2023-10-01 | Yes | Acknowledged |
| 4109 | MCL Measured: 148.00 PCI/L (limit: 15.00 PCI/L) | 2023-10-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0350 MG/L (limit: 0.0100 MG/L) | 2023-07-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0350 MG/L (limit: 0.0100 MG/L) | 2023-07-01 | Yes | Acknowledged |
| 4006 | MCL Measured: 184.75 PCI/L (limit: 20.00 PCI/L) | 2023-07-01 | Yes | Acknowledged |
| 4006 | MCL Measured: 184.75 PCI/L (limit: 20.00 PCI/L) | 2023-07-01 | Yes | Acknowledged |
| 4109 | MCL Measured: 124.17 PCI/L (limit: 15.00 PCI/L) | 2023-07-01 | Yes | Acknowledged |
| 4109 | MCL Measured: 124.17 PCI/L (limit: 15.00 PCI/L) | 2023-07-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0352 MG/L (limit: 0.0100 MG/L) | 2023-04-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0352 MG/L (limit: 0.0100 MG/L) | 2023-04-01 | Yes | Acknowledged |
| 4006 | MCL Measured: 152.25 PCI/L (limit: 20.00 PCI/L) | 2023-04-01 | Yes | Acknowledged |
| 4006 | MCL Measured: 152.25 PCI/L (limit: 20.00 PCI/L) | 2023-04-01 | Yes | Acknowledged |
| 1028 | MCL Measured: 1.30 MG/L (limit: 0.3000 MG/L) | 2023-04-01 | Yes | Returned to Compliance |
| 1032 | MCL Measured: 0.0825 MG/L (limit: 0.0500 MG/L) | 2023-04-01 | Yes | Returned to Compliance |
| 4109 | MCL Measured: 125.90 PCI/L (limit: 15.00 PCI/L) | 2023-04-01 | Yes | Acknowledged |
| 4109 | MCL Measured: 125.90 PCI/L (limit: 15.00 PCI/L) | 2023-04-01 | Yes | Acknowledged |
| 4006 | MCL Measured: 103.00 PCI/L (limit: 20.00 PCI/L) | 2023-01-01 | Yes | Acknowledged |
Showing 50 of 96 historical violations.
Understanding This Water System's Record
Sierra Linda Mutual Water Co is a community water system water system that draws from groundwater sources and serves a population of 200 in North Fork, California. This page shows its complete compliance history as reported to the EPA's Safe Drinking Water Information System (SDWIS), the federal database that tracks every public water system in the United States.
What Do These Violations Mean?
Health-based violations mean the system exceeded an EPA maximum contaminant level (MCL) or failed to provide required treatment. These indicate potential health risks from contaminants like lead, arsenic, bacteria, nitrates, or disinfection byproducts. Non-health-based violations involve monitoring, reporting, or procedural requirements — the system missed a testing deadline or failed to notify customers, but contaminant levels were not necessarily unsafe.
What Should You Do?
Your water utility is required to publish an annual Consumer Confidence Report (CCR) that details test results and any violations. If your system has active health-based violations, consider a certified water filter rated for the specific contaminants involved. The contaminant guides on this site explain health risks and filter options for common pollutants. For the most current results, contact your water utility directly — EPA data can lag weeks or months behind real-time testing.