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Superfund / NPL site · EPA Superfund SEMS through latest publishNPL Final

San Gabriel Valley (Area 2)

This site is currently on the EPA Superfund National Priorities List and remains under federal cleanup oversight. Most-cited contaminant of concern: 1,1-Dichloroethene.

Sunset & San Bernardino Freeway, West Covina, California · ZIP 91706 · EPA ID CAD980818512

See Los Angeles ContaminantsEquity contextHow we read Superfund data
CLEANUP TIMELINE

Listing-date and cleanup-phase enrichment from EPA's per-site SEMS profile is queued for a follow-up ingest pass. Until then, this section will populate from EPA's published timeline data.

Anomaly engine

Notable Signals

No notable signals at this Superfund site for the current ingest. Cleanup-phase and SEMS-action flags are deferred to a follow-up engineering pass.

Contaminants of concern · per EPA SEMS

What's In This Site

Each row pairs a contaminant with the medium it was found in (the exposure pathway). Hover any named contaminant for an agency-cited health-risk summary. Cited count = number of SEMS decision records (RODs and related) that name the pair.

ContaminantPathwayCited
1,1-DichloroetheneHealth riskVinylidene chloride; IARC Group 3 (inadequate evidence in humans) but liver toxic in animal studies; common TCE/PCE biodegradation product. (IARC, EPA)Groundwater1
1,2-DichloroethaneHealth riskIARC Group 2B possible carcinogen; liver and kidney toxic. EPA MCL 5 µg/L. (IARC, EPA)Groundwater1
BenzeneHealth riskIARC Group 1 carcinogen. Long-term inhalation causes leukemia and bone-marrow disorders. (IARC, EPA)Groundwater1
Carbon DisulfideGroundwater1
Carbon TetrachlorideHealth riskIARC Group 2B possible carcinogen; liver toxic. EPA MCL 5 µg/L. Banned for most uses since 1986. (IARC, EPA)Groundwater1
ChloroformGroundwater1
Cis-1,2-DichloroetheneHealth riskTCE biodegradation intermediate. EPA MCL 70 µg/L; lower toxicity than parent solvents but commonly co-occurs in groundwater plumes. (EPA)Groundwater1
Dichloromethane (Methylene Chloride)Health riskIARC Group 2A probable carcinogen; central-nervous-system depressant; banned for most consumer paint-stripper uses. (IARC, EPA)Groundwater1
EthylbenzeneHealth riskIARC Group 2B possible carcinogen; eye and respiratory irritant. (IARC)Groundwater1
TetrachloroetheneHealth riskPCE / 'perc'. IARC Group 2A probable carcinogen; central-nervous-system effects; common dry-cleaning solvent and DNAPL plume contaminant. EPA MCL 5 µg/L. (IARC, EPA)Groundwater1
TolueneHealth riskCentral-nervous-system depressant. Chronic high exposure causes hearing loss and developmental effects. (EPA, ATSDR)Groundwater1
Trans-1,2-DichloroetheneHealth riskTCE biodegradation intermediate. EPA MCL 100 µg/L; lower toxicity than parent solvents but commonly co-occurs in groundwater plumes. (EPA)Groundwater1
TrichloroetheneHealth riskTCE. IARC Group 1 carcinogen — kidney cancer; suspected liver cancer and non-Hodgkin lymphoma. EPA MCL 5 µg/L; common DNAPL groundwater plume contaminant. (IARC, EPA, ATSDR)Groundwater1
Xylene (Mixed Isomers)Health riskEye, skin, and respiratory irritant; central-nervous-system effects from chronic exposure. (EPA)Groundwater1
Drinking-water linkage · SDWIS

Groundwater Systems Serving Communities Within 3 Miles

The 11 systems below draw on groundwater (or mixed sources) and serve communities whose centroid sits within 3 miles of this site. Distance is to the served-city centroid — SDWIS does not expose individual wellhead locations, so this is a proximity screen, not a wellhead-impact assessment.

Water systemServesDistancePopulation servedSourceStatus
Mecks Whispering Pines Ii Llc PrivateWest Covina1.9 mi598GROUNDWATERIn compliance
Gun River Mobile Estates PrivateWest Covina1.9 mi415GROUNDWATERIn compliance
Gun River Estates West PrivateWest Covina1.9 mi152GROUNDWATERIn compliance
Arbor Village PrivateWest Covina1.9 mi670GROUNDWATERIn compliance
Sherwood Forest Mhp Pws PrivateWest Covina1.9 mi578GROUNDWATERIn compliance
Swanton Meadows PrivateWest Covina1.9 mi180GROUNDWATERIn compliance
Arrowhead Lake Mhp PrivateWest Covina1.9 mi327GROUNDWATERIn compliance
Brady Hills Ml PrivateWest Covina1.9 mi400GROUNDWATERIn compliance
Recreacres Mhc Llc PrivateWest Covina1.9 mi320GROUNDWATERIn compliance
Valley County Water Dist. MunicipalBaldwin Park2.1 mi68,871GROUNDWATERIn compliance
Valley View Mutual Water Co. PrivateBaldwin Park2.1 mi4,613GROUNDWATERUNRESOLVED

Methodology: served-city centroid (TIGER 2020) is used as the PWS coordinate. Source-water classification from SDWIS primary_source_code; only groundwater and mixed-source systems are queried. Click any system above for its full SDWIS profile.

Equity context · ACS 2018-2022 block-group demographics

Who Lives Near This Site

Within 1 mile of this site (15 Census block groups, population-weighted demographics): a population of 22,169. Why we surface this →

POPULATION SHARE
27.6%

Low-income

POPULATION SHARE
86.4%

People of color

POPULATION SHARE
5.6%

Under age 5

POPULATION SHARE
15.3%

Over age 64

Source: Census ACS 2018-2022 block-group demographics, population-weighted across the 1-mile buffer around this site (from USEPA-clone/EJAM-open blockgroupstats). NPL site proximity contributes to the national EJ pattern; indicator-level percentile and disparity scores are surfaced on the county page and the state page.

Source. EPA Superfund Enterprise Management System (SEMS) · retrieved 2026-05-07. SEMS is a federal public-domain dataset under 17 USC §105.

What this is not. We report EPA's published Superfund record — site listing, status, and contaminants of concern as named in EPA's decision documents. We do not perform site visits, independent air or water sampling, or current-state health-risk assessment. NPL listing reflects EPA's Hazard Ranking Score at a point in time; it does not by itself describe present-day exposure.