Water Health Check Report
San Diego, CA
City Of San Diego Water Utilities · Surface water source · San Diego County Water Authority (Colorado River via Metropolitan Water District; Sacramento-San Joaquin Delta via State Water Project); local reservoirs (Miramar, Sutherland, El Capitan, San Vicente)
Concerning
1 above EPA limit
4 above EWG guideline
Perchlorate MCL updated 2026—compliance transition in progress
Concerning — with 5 concerns
City Of San Diego Water Utilities has 1 contaminant above EPA legal limits and 4 above EWG health guidelines. No PFAS detected in UCMR5 sampling
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PFAS—25 compounds tested, none detected
EPA UCMR5 monitoring found no PFAS above the minimum reporting level in San Diego's water supply. This is a meaningful result: PFAS have been detected in roughly half of all tested US public water systems.
Source: EPA UCMR5 (2023–2025) · 25 compounds tested including all regulated PFAS
Contaminants tested
40 total · 4 above EWG guideline| Contaminant | Level | Status |
|---|---|---|
Perchlorate CAS 14797-73-0 | 0.21 ppb | Above EPA limit |
Total trihalomethanes (TTHMs) CAS Various | 33.7 ppb | Above guideline |
Arsenic CAS 7440-38-2 | 0.35 ppb | Above guideline |
Haloacetic acids (HAA5) CAS Various | 7.0 ppb | Above guideline |
Manganese CAS 7439-96-5 | 139.3 ppb | Above guideline |
Uranium CAS 7440-61-1 | 0.31 ppb | Within limits |
Chromium-6 (hexavalent chromium) CAS 18540-29-9 | < 0.01 ppb | Within limits |
Nitrate CAS 14797-55-8 | 0.04 ppm | Within limits |
Selenium CAS 7782-49-2 | 0.05 ppb | Within limits |
Lithium CAS 7439-93-2 | 36.4 ppb | Within limits |
Fluoride CAS 16984-48-8 | 0.43 ppm | Within limits |
Barium CAS 7440-39-3 | 0.02 ppm | Within limits |
Mercury (inorganic) CAS 7439-97-6 | ND | Not detected |
8:2 FTS (8:2 fluorotelomer sulfonic acid) CAS 39108-34-4 | ND | Not detected |
PFHxS (perfluorohexane sulfonic acid) CAS 355-46-4 | ND | Not detected |
4:2 FTS (4:2 fluorotelomer sulfonic acid) CAS 757124-72-4 | ND | Not detected |
ND | Not detected | |
PFUnA (perfluoroundecanoic acid) CAS 2058-94-8 | ND | Not detected |
PFTA (perfluorotetradecanoic acid) CAS 376-06-7 | ND | Not detected |
PFHpA (perfluoroheptanoic acid) CAS 375-85-9 | ND | Not detected |
PFTrDA (perfluorotridecanoic acid) CAS 72629-94-8 | ND | Not detected |
PFNA (perfluorononanoic acid) CAS 375-95-1 | ND | Not detected |
PFPeS (perfluoropentane sulfonic acid) CAS 2706-91-4 | ND | Not detected |
PFOS (perfluorooctane sulfonate) CAS 1763-23-1 | ND | Not detected |
PFOA (perfluorooctanoic acid) CAS 335-67-1 | ND | Not detected |
PFDA (perfluorodecanoic acid) CAS 335-76-2 | ND | Not detected |
PFDoA (perfluorododecanoic acid) CAS 307-55-1 | ND | Not detected |
PFHxA (perfluorohexanoic acid) CAS 307-24-4 | ND | Not detected |
PFBS (perfluorobutane sulfonic acid) CAS 375-73-5 | ND | Not detected |
Copper CAS 7440-50-8 | ND | Not detected |
Lead CAS 7439-92-1 | ND | Not detected |
PFHpS (perfluoroheptane sulfonic acid) CAS 375-92-8 | ND | Not detected |
ND | Not detected | |
ADONA (4,8-dioxa-3H-perfluorononanoic acid) CAS 919005-14-4 | ND | Not detected |
HFPO-DA / GenX (hexafluoropropylene oxide dimer acid) CAS 13252-13-6 | ND | Not detected |
ND | Not detected | |
6:2 FTS (6:2 fluorotelomer sulfonic acid) CAS 27619-97-2 | ND | Not detected |
ND | Not detected | |
PFBA (perfluorobutanoic acid) CAS 375-22-4 | ND | Not detected |
PFPeA (perfluoropentanoic acid) CAS 2706-90-3 | ND | Not detected |
Filter recommendation
5 contaminants above guidelines. Here's what removes them.
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Data sources
Status flags compare detected levels against both EPA legal limits and EWG health-based guidelines—which are stricter and science-derived, independent of political feasibility.