Madera Co Md1-Hidden Lake Estates
PWSID: CA2000544
This system has no unresolved violations. The most recent violation on record was 2025-07-01.
This system has more violations on record than 98% of water systems in California.
Violation trend: 10.8 per year over the last 5 years, up from 8.0 per year in the previous 5.
System Details
| Population Served | 162 |
| Service Connections | 49 |
| 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) | 0.0024 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0024 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0012 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0008 mg/L | 0.015 mg/L | Below Action Level |
Violation History (99 total)
| Contaminant | Violation | Date | Health-Based | Status |
|---|---|---|---|---|
| 2456 | MCL Measured: 0.0965 MG/L (limit: 0.0600 MG/L) | 2025-07-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1400 MG/L (limit: 0.0800 MG/L) | 2025-07-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.1425 MG/L (limit: 0.0600 MG/L) | 2025-04-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.0962 MG/L (limit: 0.0600 MG/L) | 2025-04-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.0817 MG/L (limit: 0.0600 MG/L) | 2025-01-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1175 MG/L (limit: 0.0800 MG/L) | 2025-01-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1125 MG/L (limit: 0.0800 MG/L) | 2024-10-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.0988 MG/L (limit: 0.0600 MG/L) | 2024-10-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1320 MG/L (limit: 0.0800 MG/L) | 2024-07-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1320 MG/L (limit: 0.0800 MG/L) | 2024-07-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.1170 MG/L (limit: 0.0600 MG/L) | 2024-07-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.1170 MG/L (limit: 0.0600 MG/L) | 2024-07-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1230 MG/L (limit: 0.0800 MG/L) | 2024-04-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1230 MG/L (limit: 0.0800 MG/L) | 2024-04-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.0950 MG/L (limit: 0.0600 MG/L) | 2024-04-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.0950 MG/L (limit: 0.0600 MG/L) | 2024-04-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1350 MG/L (limit: 0.0800 MG/L) | 2024-01-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1350 MG/L (limit: 0.0800 MG/L) | 2024-01-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.1300 MG/L (limit: 0.0600 MG/L) | 2024-01-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.1300 MG/L (limit: 0.0600 MG/L) | 2024-01-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1550 MG/L (limit: 0.0800 MG/L) | 2023-10-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.1110 MG/L (limit: 0.0600 MG/L) | 2023-10-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1440 MG/L (limit: 0.0800 MG/L) | 2023-07-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.1090 MG/L (limit: 0.0600 MG/L) | 2023-07-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1490 MG/L (limit: 0.0800 MG/L) | 2023-04-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.1010 MG/L (limit: 0.006000 MG/L) | 2023-04-01 | Yes | Acknowledged |
| 0200 | TT | 2023-03-01 | Yes | Acknowledged |
| 0200 | TT | 2023-03-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.2200 MG/L (limit: 0.0800 MG/L) | 2023-01-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.2200 MG/L (limit: 0.0800 MG/L) | 2023-01-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.2200 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: 0.1500 MG/L (limit: 0.0600 MG/L) | 2023-01-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1200 UG/L (limit: 0.0800 UG/L) | 2022-10-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1200 UG/L (limit: 0.0800 UG/L) | 2022-10-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 0.1200 UG/L (limit: 0.0800 UG/L) | 2022-10-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.0930 UG/L (limit: 0.0600 UG/L) | 2022-10-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.0930 UG/L (limit: 0.0600 UG/L) | 2022-10-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 0.0930 UG/L (limit: 0.0600 UG/L) | 2022-10-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 93.30 UG/L (limit: 60.00 UG/L) | 2022-07-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 93.30 UG/L (limit: 60.00 UG/L) | 2022-07-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 123.00 UG/L (limit: 80.00 UG/L) | 2022-07-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 123.00 UG/L (limit: 80.00 UG/L) | 2022-07-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 140.00 UG/L (limit: 80.00 UG/L) | 2022-04-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 140.00 UG/L (limit: 80.00 UG/L) | 2022-04-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 87.30 UG/L (limit: 80.00 UG/L) | 2022-04-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 87.30 UG/L (limit: 80.00 UG/L) | 2022-04-01 | Yes | Acknowledged |
| 2950 | MCL Measured: 153.00 UG/L (limit: 80.00 UG/L) | 2022-01-01 | Yes | Acknowledged |
| 2456 | MCL Measured: 94.00 UG/L (limit: 80.00 UG/L) | 2022-01-01 | Yes | Acknowledged |
Showing 50 of 99 historical violations.
Understanding This Water System's Record
Madera Co Md1-Hidden Lake Estates is a community water system water system that draws from surface water sources and serves a population of 162 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.