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Superfund / NPL site · EPA Superfund SEMS through latest publishNPL DeletedFEDERAL FACILITY

Materials Technology Laboratory (Usarmy)

This site has been deleted from the EPA Superfund National Priorities List — EPA's classification means construction-complete cleanup objectives were achieved, though monitoring may continue. Most-cited contaminant of concern: Benzo(B)Fluoranthene.

Off Of Us Hwy 20/N Beacon St, Watertown Town, Massachusetts · ZIP 02172 · EPA ID MA0213820939

See Middlesex 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
Benzo(B)FluorantheneSoil3
Benzo[A]AnthraceneHealth riskPAH; IARC Group 2B possible carcinogen; common combustion byproduct and creosote constituent. (IARC)Soil3
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)Soil3
Indeno(1,2,3-Cd)PyreneSoil3
Benzo(K)FluorantheneSoil2
ChlordaneHealth riskIARC Group 2B possible carcinogen; neurotoxin; banned for most uses in 1988 but residues persist. (IARC, EPA)Soil2
Dibenzo(A,H)AnthraceneSoil2
DieldrinHealth riskIARC Group 3 (inadequate evidence) but EPA classifies as 'probable human carcinogen'; neurotoxin and persistent organic pollutant. (EPA, ATSDR)Soil2
P,P'-DddHealth riskIARC Group 2A probable carcinogen; persistent bioaccumulator; banned in the US in 1972 but residues persist in soil and sediment. (IARC, EPA)Soil2
P,P'-DdeHealth riskIARC Group 2A probable carcinogen; persistent bioaccumulator; banned in the US in 1972 but residues persist in soil and sediment. (IARC, EPA)Soil2
P,P'-DdtHealth riskIARC Group 2A probable carcinogen; persistent bioaccumulator; banned in the US in 1972 but residues persist in soil and sediment. (IARC, EPA)Soil2
Aroclor 1260Health 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)Soil1
ChryseneSoil1
Heptachlor EpoxideHealth riskIARC Group 2B possible carcinogen; metabolizes to heptachlor epoxide. (IARC, EPA)Soil1
Drinking-water linkage · SDWIS

No Groundwater PWSes Serving Communities Within 3 Miles

No SDWIS public water systems drawing groundwater (or mixed sources) serve a community whose centroid sits within 3 miles of this site. Empty results are not a guarantee of non-impact — distance is computed to served-place centroids, and SDWIS does not expose individual wellhead locations.

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 (26 Census block groups, population-weighted demographics): a population of 26,693. Why we surface this →

POPULATION SHARE
20.1%

Low-income

POPULATION SHARE
35.0%

People of color

POPULATION SHARE
5.0%

Under age 5

POPULATION SHARE
13.8%

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.