Water report · not indexed
What is in the water at 91754
2 public water systems serve this ZIP code in the federal records. Everything below comes from EPA monitoring data, and everything missing is named.
CALIFORNIA WATER SERVICE CO. - ELA
PWSID CA1910036 · CA · serves 152,474 people
PFAS and lithium
6 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 25 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| lithium | 47 µg/L | 6 | 7/16/2025 |
| PFPeA | 0.013 µg/L | 5 | 7/16/2025 |
| PFOS | 0.0086 µg/L | 2 | 7/22/2025 |
| PFBA | 0.008 µg/L | 5 | 7/15/2025 |
| PFHxA | 0.0076 µg/L | 4 | 7/16/2025 |
| PFBS | 0.0049 µg/L | 3 | 7/15/2025 |
A detection is a measurement, not a violation and not a health finding. EPA states that UCMR 5 results do not indicate compliance or non-compliance with any limit.
Health-based violations
No open health-based violation on record. This covers MCL, treatment technique and MRDL violations in SDWIS that have not been returned to compliance. It excludes monitoring and reporting violations, which are the large majority nationally, so this is not “no violations”, and SDWIS completeness varies by state.
Hardness
Too few readings to state a hardness. 1 station(s), 1 result(s). Below two stations and five results this page will not state a number: a median of two readings from one creek is not your water.
MONTEREY PARK-CITY, WATER DEPT.
PWSID CA1910092 · CA · serves 62,183 people
PFAS and lithium
2 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 3 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| PFBA | 0.0074 µg/L | 2 | 9/16/2024 |
| PFPeA | 0.005 µg/L | 1 | 3/14/2025 |
A detection is a measurement, not a violation and not a health finding. EPA states that UCMR 5 results do not indicate compliance or non-compliance with any limit.
Health-based violations
1 open health-based violation(s) recorded in SDWIS and not yet returned to compliance.
- TT · contaminant code 5200 · began 2024-10-17
Hardness
Too few readings to state a hardness. 2 station(s), 2 result(s). Below two stations and five results this page will not state a number: a median of two readings from one creek is not your water.
What this report cannot tell you
Every figure describes water at a sampling point: a treatment plant, an entry point to the distribution system, or a monitoring station. None of it describes water arriving at your tap. Plumbing between the two can add lead and copper, and if your home was built before 1986 a test kit tells you something no federal dataset can.
Sources: EPA UCMR 5 occurrence (final release, frozen July 2026) · EPA SDWIS health-based violations · USGS and state monitoring via the Water Quality Portal · EPA Public Water System Service Area Boundaries v3. Compiled 2026-09-01.