Cedar Valley Mutual Water Co
PWSID: CA2000538
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 95% of water systems in California.
Violation trend: 5.8 per year over the last 5 years, up from 3.2 per year in the previous 5.
System Details
| Population Served | 137 |
| Service Connections | 67 |
| Water Source | Groundwater |
| System Type | Community Water System |
| Owner | Private |
| Status | Active |
| City | Oakhurst |
| EPA ZIP on File | 93644 |
Lead & Copper Testing
| Contaminant | Level | EPA Action Level | Status |
|---|---|---|---|
| Lead (90th percentile) | 0.0100 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0075 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0021 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0008 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 (46 total)
| Contaminant | Violation | Date | Health-Based | Status |
|---|---|---|---|---|
| 1005 | MCL Measured: 0.0190 MG/L (limit: 0.0100 MG/L) | 2025-07-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0190 MG/L (limit: 0.0100 MG/L) | 2025-04-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0190 MG/L (limit: 0.0100 MG/L) | 2025-04-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0188 MG/L (limit: 0.0100 MG/L) | 2025-01-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0190 MG/L (limit: 0.0100 MG/L) | 2025-01-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0190 MG/L (limit: 0.0100 MG/L) | 2024-10-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 20.10 UG/L (limit: 10.00 UG/L) | 2024-10-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0186 MG/L (limit: 0.0100 MG/L) | 2024-07-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0190 MG/L (limit: 0.0100 MG/L) | 2024-07-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0190 MG/L (limit: 0.0100 MG/L) | 2024-07-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 19.00 UG/L (limit: 10.00 UG/L) | 2024-07-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0180 MG/L (limit: 0.0100 MG/L) | 2024-04-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0180 MG/L (limit: 0.0100 MG/L) | 2024-04-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 18.10 UG/L (limit: 10.00 UG/L) | 2024-04-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 18.50 UG/L (limit: 10.00 UG/L) | 2024-04-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0190 MG/L (limit: 0.0100 MG/L) | 2024-01-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 18.00 UG/L (limit: 10.00 UG/L) | 2024-01-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 18.60 UG/L (limit: 10.00 UG/L) | 2024-01-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0167 MG/L (limit: 0.0100 MG/L) | 2022-10-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0167 MG/L (limit: 0.0100 MG/L) | 2022-10-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0161 MG/L (limit: 0.0100 MG/L) | 2022-07-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0161 MG/L (limit: 0.0100 MG/L) | 2022-07-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0172 MG/L (limit: 0.0100 MG/L) | 2022-04-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0172 MG/L (limit: 0.0100 MG/L) | 2022-04-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0173 MG/L (limit: 0.0100 MG/L) | 2022-01-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0198 MG/L (limit: 0.0100 MG/L) | 2021-10-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0220 MG/L (limit: 0.0100 MG/L) | 2021-07-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0221 MG/L (limit: 0.0100 MG/L) | 2021-04-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0206 MG/L (limit: 0.0100 MG/L) | 2021-01-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0209 MG/L (limit: 0.0100 MG/L) | 2020-10-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0204 MG/L (limit: 0.0100 MG/L) | 2020-07-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0204 MG/L (limit: 0.0100 MG/L) | 2020-04-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0216 MG/L (limit: 0.0100 MG/L) | 2020-01-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0212 MG/L (limit: 0.0100 MG/L) | 2019-10-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0208 MG/L (limit: 0.0100 MG/L) | 2019-07-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0196 MG/L (limit: 0.0100 MG/L) | 2019-04-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0207 MG/L (limit: 0.0100 MG/L) | 2019-01-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0200 MG/L (limit: 0.0100 MG/L) | 2018-01-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0216 MG/L (limit: 0.0100 MG/L) | 2017-10-01 | Yes | Acknowledged |
| 1005 | MR | 2017-07-01 | Major | Returned to Compliance |
| 1005 | MR | 2017-04-01 | Major | Returned to Compliance |
| 1005 | MCL Measured: 0.0220 MG/L (limit: 0.0100 MG/L) | 2017-01-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0170 MG/L (limit: 0.0100 MG/L) | 2016-07-01 | Yes | Acknowledged |
| 1005 | MCL Measured: 0.0209 MG/L (limit: 0.0100 MG/L) | 2016-01-01 | Yes | Acknowledged |
Understanding This Water System's Record
Cedar Valley Mutual Water Co is a community water system water system that draws from groundwater sources and serves a population of 137 in Oakhurst, 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.