Water report · not indexed
What is in the water at 90604
4 public water systems serve this ZIP code in the federal records. Everything below comes from EPA monitoring data, and everything missing is named.
SUBURBAN WATER SYSTEMS-LA MIRADA
PWSID CA1910059 · CA · serves 56,793 people
PFAS and lithium
7 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 12 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| lithium | 17 µg/L | 2 | 6/27/2025 |
| PFOS | 0.016 µg/L | 2 | 6/27/2025 |
| PFBA | 0.0095 µg/L | 2 | 6/27/2025 |
| PFOA | 0.007 µg/L | 2 | 6/27/2025 |
| PFBS | 0.0042 µg/L | 2 | 6/27/2025 |
| PFHxS | 0.0038 µg/L | 1 | 6/27/2025 |
| PFPeA | 0.0035 µg/L | 1 | 6/27/2025 |
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
No hardness measurement. Hardness is measured at environmental monitoring stations, and none fell inside this system’s service area. That is a gap in where monitoring happens, not a finding about the water.
GSWC - NORWALK
PWSID CA1910098 · CA · serves 43,176 people
PFAS and lithium
4 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 12 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| lithium | 58 µg/L | 4 | 7/25/2023 |
| PFPeA | 0.015 µg/L | 2 | 3/13/2024 |
| PFHxA | 0.013 µg/L | 2 | 3/13/2024 |
| PFBA | 0.0073 µg/L | 4 | 7/19/2023 |
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
No hardness measurement. Hardness is measured at environmental monitoring stations, and none fell inside this system’s service area. That is a gap in where monitoring happens, not a finding about the water.
ORCHARD DALE WATER DISTRICT
PWSID CA1910101 · CA · serves 25,000 people
PFAS and lithium
7 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 14 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| PFOS | 0.023 µg/L | 2 | 4/1/2025 |
| PFPeA | 0.01 µg/L | 2 | 4/1/2025 |
| PFOA | 0.0099 µg/L | 2 | 4/1/2025 |
| PFBA | 0.0088 µg/L | 2 | 4/1/2025 |
| PFBS | 0.0072 µg/L | 2 | 4/1/2025 |
| PFHxA | 0.0072 µg/L | 2 | 4/1/2025 |
| PFHxS | 0.004 µg/L | 2 | 4/1/2025 |
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
No hardness measurement. Hardness is measured at environmental monitoring stations, and none fell inside this system’s service area. That is a gap in where monitoring happens, not a finding about the water.
SUBURBAN WATER SYSTEMS-WHITTIER
PWSID CA1910174 · CA · serves 66,045 people
PFAS and lithium
6 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 12 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| PFOS | 0.013 µg/L | 2 | 4/18/2024 |
| PFBA | 0.0086 µg/L | 2 | 4/18/2024 |
| PFOA | 0.0063 µg/L | 2 | 4/18/2024 |
| PFPeA | 0.004 µg/L | 2 | 4/18/2024 |
| PFBS | 0.0039 µg/L | 2 | 4/18/2024 |
| PFHxA | 0.003 µg/L | 2 | 4/18/2024 |
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
No hardness measurement. Hardness is measured at environmental monitoring stations, and none fell inside this system’s service area. That is a gap in where monitoring happens, not a finding about the 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.