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

Lockheed West Seattle

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

3443 W. Marginal Way, Seattle, Washington · ZIP 98106 · EPA ID WAN001002655

See King 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
PentachlorophenolHealth riskIARC Group 1 carcinogen; wood preservative; persistent in soil and groundwater. (IARC, EPA)Sediment2
TributylstannanyliumSediment2
1,2-DihydroacenaphthyleneSediment1
AntimonyHealth riskInhaled antimony trioxide is an IARC Group 2B possible carcinogen; respiratory and cardiovascular effects from long-term exposure. EPA MCL 6 µg/L. (IARC, EPA)Sediment1
ArsenicHealth riskIARC Group 1 carcinogen via inhalation and ingestion. EPA MCL 10 µg/L; chronic exposure causes skin, lung, bladder cancer and cardiovascular disease. (IARC, EPA, ATSDR)Sediment1
Benzo(B)FluorantheneSediment1
Benzo(Ghi)PeryleneSediment1
Benzo[A]AnthraceneHealth riskPAH; IARC Group 2B possible carcinogen; common combustion byproduct and creosote constituent. (IARC)Sediment1
Benzo[A]PyreneHealth riskPAH; IARC Group 1 carcinogen; the prototypical PAH used to benchmark PAH-mixture cancer risk. EPA MCL 0.2 µg/L. (IARC, EPA)Sediment1
Bis(2-Ethylhexyl)PhthalateSediment1
CadmiumSediment1
Carcinogenic Polycyclic Aromatic Hydrocarbons (Cpah)Health riskPAH class includes IARC Group 1 carcinogens (e.g., benzo[a]pyrene); long-term exposure raises cancer risk. (IARC, EPA)Sediment1
Chlorinated Dioxins And FuransSediment1
ChromiumHealth riskHexavalent chromium (Cr-VI) is an IARC Group 1 carcinogen via inhalation, causing lung cancer; trivalent chromium is far less toxic. (IARC, EPA)Sediment1
ChryseneSediment1
CobaltSediment1
CopperHealth riskInhaled copper fumes cause metal-fume fever; chronic ingestion above EPA's 1.3 mg/L action level damages the liver. (EPA)Sediment1
Dibenzo(A,H)AnthraceneSediment1
FluorantheneSediment1
Indeno(1,2,3-Cd)PyreneSediment1
LeadHealth riskNeurotoxin. Even low childhood exposure impairs cognitive development; chronic adult exposure damages kidneys and the cardiovascular system. (EPA, ATSDR)Sediment1
MercuryHealth riskNeurotoxin. Methylmercury bioaccumulates up the food chain and damages the developing nervous system. (EPA, ATSDR)Sediment1
NickelHealth riskNickel compounds are IARC Group 1 carcinogens; inhalation exposure raises lung and nasal cancer risk. (IARC)Sediment1
PhenanthreneSediment1
Polychlorinated Biphenyls (Pcbs)Health riskPCBs. IARC Group 1 carcinogen; immune, reproductive, and neurological effects; bioaccumulate in fish and breast milk. Banned in 1979; persist as legacy contamination. (IARC, EPA)Sediment1
Polycyclic Aromatic Hydrocarbons (Pahs)Health riskPAH class includes IARC Group 1 carcinogens (e.g., benzo[a]pyrene); long-term exposure raises cancer risk. (IARC, EPA)Sediment1
Polycyclic Aromatic Hydrocarbons, High Molecular Weight (Hpahs)Sediment1
SeleniumSediment1
VanadiumHealth riskRespiratory irritant. Chronic high exposure causes 'green tongue' and bronchitis. (NIOSH)Sediment1
ZincHealth riskGenerally low acute toxicity. Chronic high-dose exposure disrupts copper absorption and immune function. (ATSDR)Sediment1
Drinking-water linkage · SDWIS

Groundwater Systems Serving Communities Within 3 Miles

The 12 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
Hot Springs Court PrivateSeattle2.5 mi55GROUNDWATERIn compliance
Montipark Llc PrivateSeattle2.5 mi60GROUNDWATERIn compliance
Hidden Village Mhp, Llc PrivateSeattle2.5 mi66GROUNDWATERIn compliance
Country Homes Mobile Park PrivateSeattle2.5 mi90GROUNDWATERIn compliance
Valley Mobile Home Park PrivateSeattle2.5 mi120GROUNDWATERIn compliance
Pcm Aria Marion Llc PrivateSeattle2.5 mi230GROUNDWATERIn compliance
Brunswick Hills Mhp PrivateSeattle2.5 mi50GROUNDWATERIn compliance
Golf Mhp PrivateSeattle2.5 mi60GROUNDWATERIn compliance
River Village Mhp PrivateSeattle2.5 mi40GROUNDWATERIn compliance
Cherrywood Mobile Home Manor PrivateSeattle2.5 mi120GROUNDWATERUNRESOLVED
Majestic Oaks Water System PrivateSeattle2.5 mi28GROUNDWATERIn compliance
Ravenwing Ranch PrivateSeattle2.5 mi250GROUNDWATERIn compliance

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 (3 Census block groups, population-weighted demographics): a population of 4,029. Why we surface this →

POPULATION SHARE
9.2%

Low-income

POPULATION SHARE
22.3%

People of color

POPULATION SHARE
6.2%

Under age 5

POPULATION SHARE
16.3%

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.