Water report · not indexed
What is in the water at 92154
4 public water systems serve this ZIP code in the federal records. Everything below comes from EPA monitoring data, and everything missing is named.
CAL-AM WATER CORONADO
PWSID CA3710001 · CA · serves 106,000 people
PFAS and lithium
1 compound detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 4 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| lithium | 66 µg/L | 4 | 9/6/2023 |
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
Median hardness 131 mg/L as CaCO₃, measured at 5 stations serving this system across 10 results, 2017-02-07 to 2019-08-15. Measured in the water source and distribution area, not at a tap, and not in your home.
SAN DIEGO, CITY OF
PWSID CA3710020 · CA · serves 1,385,379 people
PFAS and lithium
1 compound detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 15 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| lithium | 65 µg/L | 15 | 7/20/2023 |
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
Median hardness 7695 mg/L as CaCO₃, measured at 5 stations serving this system across 14 results, 2015-09-11 to 2019-08-19. Measured in the water source and distribution area, not at a tap, and not in your home.
SWEETWATER AUTHORITY
PWSID CA3710025 · CA · serves 191,282 people
PFAS and lithium
9 compounds detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 34 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| lithium | 14 µg/L | 3 | 7/17/2025 |
| PFBA | 0.012 µg/L | 4 | 7/17/2025 |
| PFOA | 0.011 µg/L | 4 | 7/17/2025 |
| PFBS | 0.011 µg/L | 4 | 7/17/2025 |
| PFHxS | 0.0094 µg/L | 4 | 7/17/2025 |
| PFHxA | 0.0086 µg/L | 4 | 7/17/2025 |
| PFPeA | 0.0076 µg/L | 4 | 7/17/2025 |
| PFOS | 0.0057 µg/L | 3 | 7/17/2025 |
| PFHpA | 0.0047 µg/L | 4 | 7/17/2025 |
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
Median hardness 1125 mg/L as CaCO₃, measured at 23 stations serving this system across 46 results, 2015-09-01 to 2019-08-13. Measured in the water source and distribution area, not at a tap, and not in your home.
OTAY WATER DISTRICT
PWSID CA3710034 · CA · serves 238,008 people
PFAS and lithium
1 compound detected at or above the reporting limit under EPA’s UCMR 5 monitoring, across 6 samples.
| Compound | Highest detected | Samples | Most recent |
|---|---|---|---|
| lithium | 29 µg/L | 6 | 7/10/2023 |
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
Too few readings to state a hardness. 1 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.