Nps-Wolverton
PWSID: CA5410503
This system has unresolved violations related to monitoring, reporting, or procedural requirements, but none involve contaminant levels exceeding EPA health limits.
This system has more violations on record than 99% of water systems in California.
Violation trend: 1.2 per year over the last 5 years, down from 3.2 per year in the previous 5.
System Details
| Population Served | 2,940 |
| Service Connections | 125 |
| Water Source | Surface Water |
| System Type | Community Water System |
| Owner | Federal |
| Status | Active |
| City | Three Rivers |
| EPA ZIP on File | 93271 |
Lead & Copper Testing
| Contaminant | Level | EPA Action Level | Status |
|---|---|---|---|
| Copper (90th percentile) | 1.5600 mg/L | 1.300 mg/L | Exceeds Action Level |
| Lead (90th percentile) | 0.0620 mg/L | 0.015 mg/L | Exceeds Action Level |
| Lead (90th percentile) | 0.0295 mg/L | 0.015 mg/L | Exceeds Action Level |
| Lead (90th percentile) | 0.0220 mg/L | 0.015 mg/L | Exceeds Action Level |
| Lead (90th percentile) | 0.0128 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0120 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0027 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0010 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0000 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0000 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0000 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0000 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0000 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0000 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0000 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0000 mg/L | 0.015 mg/L | Below Action Level |
2 Active Violations
| Contaminant | Violation | Date | Health-Based | Status |
|---|---|---|---|---|
| 5200 | RPT | 2025-07-02 | Open | |
| 5000 | MR | 2018-07-01 | Open |
Violation History (117 total)
| Contaminant | Violation | Date | Health-Based | Status |
|---|---|---|---|---|
| 8000 | MON | 2024-04-01 | Returned to Compliance | |
| 8000 | MON | 2024-04-01 | Acknowledged | |
| 8000 | MON | 2024-04-01 | Returned to Compliance | |
| 7000 | Other | 2022-07-01 | Returned to Compliance | |
| 7000 | Other | 2022-07-01 | Returned to Compliance | |
| 2456 | MCL Measured: 0.0650 MG/L (limit: 0.0600 MG/L) | 2020-07-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.0660 MG/L (limit: 0.0600 MG/L) | 2020-04-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.0690 MG/L (limit: 0.0600 MG/L) | 2020-01-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.0680 MG/L (limit: 0.0600 MG/L) | 2018-04-01 | Yes | Returned to Compliance |
| 2950 | MCL Measured: 0.0850 MG/L (limit: 0.0800 MG/L) | 2018-01-01 | Yes | Returned to Compliance |
| 2456 | MCL Measured: 0.0900 MG/L (limit: 0.0600 MG/L) | 2018-01-01 | Yes | Returned to Compliance |
| 2950 | MCL Measured: 0.0920 MG/L (limit: 0.0800 MG/L) | 2017-10-01 | Yes | Returned to Compliance |
| 2456 | MCL Measured: 0.1160 MG/L (limit: 0.0600 MG/L) | 2017-10-01 | Yes | Returned to Compliance |
| 2950 | MCL Measured: 0.0860 MG/L (limit: 0.0800 MG/L) | 2017-07-01 | Yes | Returned to Compliance |
| 2456 | MCL Measured: 0.1210 MG/L (limit: 0.0600 MG/L) | 2017-07-01 | Yes | Returned to Compliance |
| 2456 | MCL Measured: 0.0870 MG/L (limit: 0.0600 MG/L) | 2017-04-01 | Yes | Returned to Compliance |
| 2456 | MCL Measured: 0.0920 MG/L (limit: 0.0600 MG/L) | 2017-01-01 | Yes | Returned to Compliance |
| 2950 | MCL Measured: 0.0820 MG/L (limit: 0.0800 MG/L) | 2017-01-01 | Yes | Returned to Compliance |
| 2456 | MCL Measured: 0.0760 MG/L (limit: 0.0600 MG/L) | 2016-10-01 | Yes | Returned to Compliance |
| 2456 | MCL Measured: 0.0700 MG/L (limit: 0.0600 MG/L) | 2016-07-01 | Yes | Returned to Compliance |
| 2950 | MCL Measured: 0.0910 MG/L (limit: 0.0800 MG/L) | 2016-04-01 | Yes | Returned to Compliance |
| 2456 | MCL Measured: 0.0870 MG/L (limit: 0.0600 MG/L) | 2016-04-01 | Yes | Returned to Compliance |
| 2950 | MCL Measured: 0.0860 MG/L (limit: 0.0800 MG/L) | 2016-01-01 | Yes | Returned to Compliance |
| 2456 | MCL Measured: 0.0890 MG/L (limit: 0.0600 MG/L) | 2016-01-01 | Yes | Returned to Compliance |
| 2950 | MCL Measured: 0.0910 MG/L (limit: 0.0800 MG/L) | 2015-10-01 | Yes | Returned to Compliance |
| 2456 | MCL Measured: 0.0840 MG/L (limit: 0.0600 MG/L) | 2015-10-01 | Yes | Returned to Compliance |
| 2950 | MCL Measured: 0.0960 MG/L (limit: 0.0800 MG/L) | 2015-07-01 | Yes | Returned to Compliance |
| 2456 | MCL Measured: 0.0860 MG/L (limit: 0.0600 MG/L) | 2015-07-01 | Yes | Returned to Compliance |
| 2950 | MCL Measured: 0.0930 MG/L (limit: 0.0800 MG/L) | 2015-04-01 | Yes | Returned to Compliance |
| 2456 | MCL Measured: 0.0960 MG/L (limit: 0.0600 MG/L) | 2015-04-01 | Yes | Returned to Compliance |
| 2950 | MCL Measured: 0.1130 MG/L (limit: 0.0800 MG/L) | 2015-01-01 | Yes | Returned to Compliance |
| 2456 | MCL Measured: 0.1610 MG/L (limit: 0.0600 MG/L) | 2015-01-01 | Yes | Returned to Compliance |
| 2950 | MCL Measured: 0.1030 MG/L (limit: 0.0800 MG/L) | 2014-10-01 | Yes | Returned to Compliance |
| 2456 | MCL Measured: 0.1530 MG/L (limit: 0.0600 MG/L) | 2014-10-01 | Yes | Returned to Compliance |
| 2950 | MCL Measured: 0.0960 MG/L (limit: 0.0800 MG/L) | 2014-07-01 | Yes | Returned to Compliance |
| 2456 | MCL Measured: 0.1520 MG/L (limit: 0.0600 MG/L) | 2014-07-01 | Yes | Returned to Compliance |
| 0200 | TT | 2014-04-01 | Yes | Returned to Compliance |
| 2456 | MCL Measured: 0.0760 MG/L (limit: 0.0600 MG/L) | 2013-07-01 | Yes | Returned to Compliance |
| 2456 | MCL Measured: 0.0760 MG/L (limit: 0.0600 MG/L) | 2013-07-01 | Yes | Returned to Compliance |
| 2950 | MCL Measured: 0.0900 MG/L (limit: 0.0800 MG/L) | 2013-07-01 | Yes | Returned to Compliance |
| 2950 | MCL Measured: 0.0900 MG/L (limit: 0.0800 MG/L) | 2013-07-01 | Yes | Returned to Compliance |
| 2950 | MCL Measured: 0.0838 MG/L (limit: 0.0800 MG/L) | 2013-04-01 | Yes | Returned to Compliance |
| 2950 | MCL Measured: 0.0838 MG/L (limit: 0.0800 MG/L) | 2013-04-01 | Yes | Returned to Compliance |
| 2456 | MCL Measured: 0.0988 MG/L (limit: 0.0600 MG/L) | 2013-04-01 | Yes | Returned to Compliance |
| 2456 | MCL Measured: 0.0988 MG/L (limit: 0.0600 MG/L) | 2013-04-01 | Yes | Returned to Compliance |
| 2950 | MCL Measured: 0.0860 MG/L (limit: 0.0800 MG/L) | 2013-01-01 | Yes | Returned to Compliance |
| 2950 | MCL Measured: 0.0860 MG/L (limit: 0.0800 MG/L) | 2013-01-01 | Yes | Returned to Compliance |
| 2456 | MCL Measured: 0.1010 MG/L (limit: 0.0600 MG/L) | 2013-01-01 | Yes | Returned to Compliance |
| 2456 | MCL Measured: 0.1010 MG/L (limit: 0.0600 MG/L) | 2013-01-01 | Yes | Returned to Compliance |
| 2950 | MCL Measured: 0.0810 MG/L (limit: 0.0800 MG/L) | 2012-10-01 | Yes | Returned to Compliance |
Showing 50 of 115 historical violations.
Understanding This Water System's Record
Nps-Wolverton is a community water system water system that draws from surface water sources and serves a population of 2,940 in Three Rivers, 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.