Madera Co Sa16 Sumner Hill
PWSID: CA2000729
This system has no unresolved violations. The most recent violation on record was 2025-07-01.
This system has more violations on record than 97% of water systems in California.
Violation trend: 8.2 per year over the last 5 years, up from 6.2 per year in the previous 5.
System Details
| Population Served | 135 |
| Service Connections | 43 |
| Water Source | Surface Water |
| System Type | Community Water System |
| Owner | Local Government |
| Status | Active |
| City | Madera |
| EPA ZIP on File | 93637 |
Lead & Copper Testing
| Contaminant | Level | EPA Action Level | Status |
|---|---|---|---|
| Lead (90th percentile) | 0.0040 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) | 0.0031 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0013 mg/L | 0.015 mg/L | Below Action Level |
Violation History (77 total)
| Contaminant | Violation | Date | Health-Based | Status |
|---|---|---|---|---|
| 2950 | MCL Measured: 0.1052 MG/L (limit: 0.0800 MG/L) | 2025-07-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.1400 MG/L (limit: 0.0600 MG/L) | 2025-07-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1030 MG/L (limit: 0.0800 MG/L) | 2025-04-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.1280 MG/L (limit: 0.0600 MG/L) | 2025-04-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1060 MG/L (limit: 0.0800 MG/L) | 2025-01-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.1340 MG/L (limit: 0.0600 MG/L) | 2025-01-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.0835 MG/L (limit: 0.0800 MG/L) | 2024-10-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.1078 MG/L (limit: 0.0600 MG/L) | 2024-10-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.1020 MG/L (limit: 0.0600 MG/L) | 2024-07-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.1020 MG/L (limit: 0.0600 MG/L) | 2024-07-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.0890 MG/L (limit: 0.0800 MG/L) | 2024-07-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.0890 MG/L (limit: 0.0800 MG/L) | 2024-07-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1020 MG/L (limit: 0.0800 MG/L) | 2024-04-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1020 MG/L (limit: 0.0800 MG/L) | 2024-04-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.1020 MG/L (limit: 0.0600 MG/L) | 2024-04-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.1020 MG/L (limit: 0.0600 MG/L) | 2024-04-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1120 MG/L (limit: 0.0800 MG/L) | 2024-01-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1120 MG/L (limit: 0.0800 MG/L) | 2024-01-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.1150 MG/L (limit: 0.0600 MG/L) | 2024-01-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.1150 MG/L (limit: 0.0600 MG/L) | 2024-01-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1210 MG/L (limit: 0.0800 MG/L) | 2023-10-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.1150 MG/L (limit: 0.0600 MG/L) | 2023-10-01 | Yes | Acknowledged |
| 0200 | TT | 2023-07-01 | Yes | Returned to Compliance |
| 0200 | TT | 2023-07-01 | Yes | Returned to Compliance |
| 2950 | MCL Measured: 0.1130 MG/L (limit: 0.0800 MG/L) | 2023-07-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.0980 MG/L (limit: 0.0600 MG/L) | 2023-07-01 | Yes | Acknowledged |
| 0200 | TT | 2023-06-01 | Yes | Returned to Compliance |
| 0200 | TT | 2023-06-01 | Yes | Returned to Compliance |
| 0200 | TT | 2023-05-01 | Yes | Returned to Compliance |
| 0200 | TT | 2023-05-01 | Yes | Returned to Compliance |
| 2950 | MCL Measured: 0.1300 MG/L (limit: 0.0800 MG/L) | 2023-01-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1300 MG/L (limit: 0.0800 MG/L) | 2023-01-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.1500 MG/L (limit: 0.0600 MG/L) | 2023-01-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.1500 MG/L (limit: 0.0600 MG/L) | 2023-01-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.0735 UG/L (limit: 0.0600 UG/L) | 2022-10-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.0735 UG/L (limit: 0.0600 UG/L) | 2022-10-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.0735 UG/L (limit: 0.0600 UG/L) | 2022-10-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 74.50 UG/L (limit: 60.00 UG/L) | 2022-07-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 74.50 UG/L (limit: 60.00 UG/L) | 2022-07-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 68.80 UG/L (limit: 60.00 UG/L) | 2022-04-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 68.80 UG/L (limit: 60.00 UG/L) | 2022-04-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.0740 MG/L (limit: 0.0600 MG/L) | 2020-04-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.0840 UG/L (limit: 0.0600 UG/L) | 2020-01-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1170 MG/L (limit: 0.0800 MG/L) | 2019-10-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.1360 MG/L (limit: 0.0600 MG/L) | 2019-10-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1310 MG/L (limit: 0.0800 MG/L) | 2019-07-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.1600 MG/L (limit: 0.0600 MG/L) | 2019-07-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1370 MG/L (limit: 0.0800 MG/L) | 2019-04-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.1620 MG/L (limit: 0.0600 MG/L) | 2019-04-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1310 MG/L (limit: 0.0800 MG/L) | 2019-01-01 | Yes | Acknowledged |
Showing 50 of 77 historical violations.
Understanding This Water System's Record
Madera Co Sa16 Sumner Hill is a community water system water system that draws from surface water sources and serves a population of 135 in Madera, 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.