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

New London Submarine Base

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

Route 12 Crystal Lake Rd, Conning Towers-Nautilus Park, Connecticut · ZIP 06349 · EPA ID CTD980906515

See New London 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
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)Soil8
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)Soil6
LeadHealth riskNeurotoxin. Even low childhood exposure impairs cognitive development; chronic adult exposure damages kidneys and the cardiovascular system. (EPA, ATSDR)Soil6
Benzo(B)FluorantheneSoil5
Benzo[A]AnthraceneHealth riskPAH; IARC Group 2B possible carcinogen; common combustion byproduct and creosote constituent. (IARC)Soil5
BerylliumSoil5
CadmiumSoil5
1,4-DichlorobenzeneHealth riskIARC Group 2B possible carcinogen; common in mothballs and air fresheners. EPA MCL 75 µg/L. (IARC, EPA)Groundwater4
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)Soil4
BerylliumGroundwater4
Chloroethene (Vinyl Chloride)Health riskIARC Group 1 carcinogen — angiosarcoma of the liver. Final TCE/PCE biodegradation product; commonly found in groundwater plumes. EPA MCL 2 µg/L. (IARC, EPA)Groundwater4
Dibenzo(A,H)AnthraceneSoil4
Indeno(1,2,3-Cd)PyreneSoil4
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)Soil4
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)Groundwater4
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)Groundwater3
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)Groundwater3
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)Sediment3
BariumHealth riskSoluble barium compounds are toxic if ingested, affecting the heart, kidneys, and nervous system. Insoluble forms (e.g. barium sulfate) are far less toxic. (EPA)Groundwater3
BariumHealth riskSoluble barium compounds are toxic if ingested, affecting the heart, kidneys, and nervous system. Insoluble forms (e.g. barium sulfate) are far less toxic. (EPA)Soil3
Benzo(K)FluorantheneSoil3
Bis(2-Ethylhexyl)PhthalateGroundwater3
CadmiumGroundwater3
CadmiumSediment3
ChromiumHealth riskHexavalent chromium (Cr-VI) is an IARC Group 1 carcinogen via inhalation, causing lung cancer; trivalent chromium is far less toxic. (IARC, EPA)Groundwater3
ChromiumHealth riskHexavalent chromium (Cr-VI) is an IARC Group 1 carcinogen via inhalation, causing lung cancer; trivalent chromium is far less toxic. (IARC, EPA)Sediment3
DieldrinHealth riskIARC Group 3 (inadequate evidence) but EPA classifies as 'probable human carcinogen'; neurotoxin and persistent organic pollutant. (EPA, ATSDR)Soil3
Indeno(1,2,3-Cd)PyreneGroundwater3
ManganeseHealth riskExcess inhalation can cause manganism, a Parkinson-like neurological disorder. (ATSDR)Groundwater3
ManganeseHealth riskExcess inhalation can cause manganism, a Parkinson-like neurological disorder. (ATSDR)Sediment3

Showing the top 30 pairs by SEMS citation count. 94 additional (contaminant, pathway) pairs are recorded for this site.

Drinking-water linkage · SDWIS

Groundwater Systems Serving Communities Within 3 Miles

The 16 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
Scwa, Barrett Division (Bar) MunicipalGales Ferry1.5 mi300GROUNDWATERIn compliance
Scwa, Tower-Ferry View Division MunicipalGales Ferry1.5 mi2,567GROUNDWATER2 HEALTH-BASED · 5YR
Scwa, Ledyard Center Division MunicipalGales Ferry1.5 mi652GROUNDWATERIn compliance
Scwa, Chriswood Division (Cwd) MunicipalGales Ferry1.5 mi164GROUNDWATERIn compliance
Scwa, Montville Division (Mtv) MunicipalGales Ferry1.5 mi2,570GROUNDWATERIn compliance
Scwa, Mohegan Division MunicipalGales Ferry1.5 mi1,428GROUNDWATERIn compliance
Scwa, Oakdale Heights Division PrivateGales Ferry1.5 mi876GROUNDWATERUNRESOLVED
Scwa, Chesterfield Division MunicipalGales Ferry1.5 mi524GROUNDWATERIn compliance
Scwa, Robin Hill Division (Rbn) MunicipalGales Ferry1.5 mi388GROUNDWATERIn compliance
Scwa, Birchwood Division (Bwd) MunicipalGales Ferry1.5 mi108GROUNDWATERIn compliance
Scwa, Seven Oaks (Oak) MunicipalGales Ferry1.5 mi26GROUNDWATERIn compliance
Scwa, Cedar Ridge Division MunicipalGales Ferry1.5 mi370GROUNDWATERIn compliance
Scwa, North Stonington Division (Nst) MunicipalGales Ferry1.5 mi1,860GROUNDWATERUNRESOLVED
Sunny Waters Mobile Home Park PrivateGales Ferry1.5 mi303GROUNDWATERIn compliance
Lincoln Park Elderly Housing MunicipalGales Ferry1.5 mi80GROUNDWATERUNRESOLVED
Green Village Ii PrivateGales Ferry1.5 mi96GROUNDWATERIn 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

Around this site Population Characteristics

EQUITY INGEST PENDING FOR THIS GEOGRAPHY

Connecticut state-level (no place or county match).

Demographic shares, national-percentile rankings (PM2.5, ozone, NO₂, diesel particulate, lead-paint risk, NPL/RMP/TSDF/NPDES proximity, drinking-water non-compliance), and EJ disparity scores will render here once the EJScreen-clone ingest completes for this geography. Why this section matters →

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.