Water report · not indexed
What is in the water at 92705
5 public water systems serve this ZIP code in the federal records. Everything below comes from EPA monitoring data, and everything missing is named.
CITY OF ORANGE
PWSID CA3010027 · CA · serves 120,770 people
PFAS and lithium
8 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 70 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| lithium | 36 µg/L | 16 | 9/13/2023 |
| PFPeA | 0.018 µg/L | 15 | 9/12/2023 |
| PFOS | 0.017 µg/L | 5 | 9/10/2024 |
| PFBA | 0.013 µg/L | 11 | 9/12/2023 |
| PFHxS | 0.01 µg/L | 4 | 9/10/2024 |
| PFHxA | 0.01 µg/L | 12 | 9/10/2024 |
| PFOA | 0.0093 µg/L | 4 | 9/10/2024 |
| PFBS | 0.0033 µg/L | 3 | 9/10/2024 |
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.
CITY OF SANTA ANA
PWSID CA3010038 · CA · serves 310,539 people
PFAS and lithium
6 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 42 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| lithium | 42 µg/L | 9 | 9/13/2023 |
| PFOS | 0.014 µg/L | 7 | 9/24/2024 |
| PFOA | 0.0089 µg/L | 8 | 9/24/2024 |
| PFHxS | 0.0084 µg/L | 9 | 9/24/2024 |
| PFPeA | 0.0059 µg/L | 5 | 8/15/2024 |
| PFHxA | 0.004 µg/L | 4 | 8/15/2024 |
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
Median hardness 245 mg/L as CaCO₃, measured at 5 stations serving this system across 7 results, 2016-07-27 to 2020-07-30. Measured in the water source and distribution area, not at a tap, and not in your home.
CITY OF TUSTIN
PWSID CA3010046 · CA · serves 66,600 people
PFAS and lithium
4 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 13 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| lithium | 38 µg/L | 9 | 9/13/2023 |
| PFOS | 0.0042 µg/L | 1 | 4/22/2025 |
| PFPeA | 0.0037 µg/L | 1 | 11/20/2025 |
| PFHxS | 0.0035 µg/L | 2 | 4/22/2025 |
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.
GOLDEN STATE WC - COWAN HEIGHTS
PWSID CA3010047 · CA · serves 7,006 people
PFAS and lithium
3 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 11 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| lithium | 59 µg/L | 6 | 7/7/2025 |
| PFPeA | 0.007 µg/L | 2 | 10/27/2025 |
| PFBA | 0.0069 µg/L | 3 | 4/8/2025 |
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.
IRVINE RANCH WATER DISTRICT
PWSID CA3010092 · CA · serves 444,800 people
PFAS and lithium
3 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 21 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| lithium | 67 µg/L | 18 | 9/13/2023 |
| PFBA | 0.0079 µg/L | 2 | 7/15/2025 |
| PFPeA | 0.0038 µg/L | 1 | 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
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.