Water Health Check Report
Los Angeles, CA
Los Angeles Dept. Of Water & Power (Ladwp) · Surface water source · Metropolitan Water District of Southern California (Colorado River via CRA; Sacramento/San Joaquin Delta via State Water Project); local groundwater (San Fernando Valley Basin)
Concerning
1 above EPA limit
6 above EWG guideline
Perchlorate MCL updated 2026—compliance transition in progress
Concerning — with 7 concerns
Los Angeles Dept. Of Water & Power (Ladwp) has 1 contaminant above EPA legal limits and 6 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 Los Angeles'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
Source water—blended supply
Los Angeles Dept. Of Water & Power (Ladwp) blends surface water and local groundwater. The figures above reflect utility-wide averages across all distribution zones. Water chemistry—particularly hardness, nitrates, and naturally occurring minerals—can vary meaningfully by district and season depending on the blend ratio. If your neighbourhood draws primarily from the groundwater portion, contaminant levels for minerals and agricultural compounds may differ from the utility average shown here.
Source: Metropolitan Water District of Southern California (Colorado River via CRA; Sacramento/San Joaquin Delta via State Water Project); local groundwater (San Fernando Valley Basin)
Contaminants tested
40 total · 6 above EWG guideline| Contaminant | Level | Status |
|---|---|---|
Perchlorate CAS 14797-73-0 | 0.81 ppb | Above EPA limit |
Arsenic CAS 7440-38-2 | 3.7 ppb | Above guideline |
Total trihalomethanes (TTHMs) CAS Various | 21.5 ppb | Above guideline |
Haloacetic acids (HAA5) CAS Various | 7.3 ppb | Above guideline |
Chromium-6 (hexavalent chromium) CAS 18540-29-9 | 1.2 ppb | Above guideline |
Nitrate CAS 14797-55-8 | 1.3 ppm | Above guideline |
Manganese CAS 7439-96-5 | 144.7 ppb | Above guideline |
Uranium CAS 7440-61-1 | 0.15 ppb | Within limits |
Selenium CAS 7782-49-2 | 1.0 ppb | Within limits |
Mercury (inorganic) CAS 7439-97-6 | < 0.01 ppb | Within limits |
Fluoride CAS 16984-48-8 | 0.69 ppm | Within limits |
Barium CAS 7440-39-3 | 0.05 ppm | Within limits |
Copper CAS 7440-50-8 | 0.01 ppm | Within limits |
Lithium CAS 7439-93-2 | 58.3 ppb | Within limits |
PFPeA (perfluoropentanoic acid) CAS 2706-90-3 | ND | Not detected |
PFPeS (perfluoropentane sulfonic acid) CAS 2706-91-4 | ND | Not detected |
ND | Not detected | |
ND | Not detected | |
PFHxA (perfluorohexanoic acid) CAS 307-24-4 | ND | Not detected |
PFTrDA (perfluorotridecanoic acid) CAS 72629-94-8 | ND | Not detected |
PFTA (perfluorotetradecanoic acid) CAS 376-06-7 | ND | Not detected |
PFOA (perfluorooctanoic acid) CAS 335-67-1 | ND | Not detected |
PFHpA (perfluoroheptanoic acid) CAS 375-85-9 | ND | Not detected |
PFNA (perfluorononanoic acid) CAS 375-95-1 | ND | Not detected |
Lead CAS 7439-92-1 | ND | Not detected |
PFUnA (perfluoroundecanoic acid) CAS 2058-94-8 | ND | Not detected |
PFDA (perfluorodecanoic acid) CAS 335-76-2 | ND | Not detected |
PFOS (perfluorooctane sulfonate) CAS 1763-23-1 | ND | Not detected |
PFHpS (perfluoroheptane sulfonic acid) CAS 375-92-8 | ND | Not detected |
PFHxS (perfluorohexane sulfonic acid) CAS 355-46-4 | ND | Not detected |
PFBS (perfluorobutane sulfonic acid) CAS 375-73-5 | ND | Not detected |
ND | Not detected | |
8:2 FTS (8:2 fluorotelomer sulfonic acid) CAS 39108-34-4 | ND | Not detected |
4:2 FTS (4:2 fluorotelomer sulfonic acid) CAS 757124-72-4 | ND | Not detected |
6:2 FTS (6:2 fluorotelomer sulfonic acid) CAS 27619-97-2 | ND | Not detected |
HFPO-DA / GenX (hexafluoropropylene oxide dimer acid) CAS 13252-13-6 | ND | Not detected |
ADONA (4,8-dioxa-3H-perfluorononanoic acid) CAS 919005-14-4 | ND | Not detected |
PFBA (perfluorobutanoic acid) CAS 375-22-4 | ND | Not detected |
PFDoA (perfluorododecanoic acid) CAS 307-55-1 | ND | Not detected |
ND | Not detected |
Filter recommendation
7 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.