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

Union Pacific Railroad Co.

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: 1,1,2,2-Tetrachloroethane.

300 S Harrison, Pocatello, Idaho · ZIP 83201 · EPA ID IDD055030852

See Bannock 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
1,1,2,2-TetrachloroethaneSludge1
1,1-DichloroethaneHealth riskSuspected carcinogen (EPA C/likely); CNS depressant. Common at solvent-contaminated sites as a degradation intermediate. (EPA, ATSDR)Groundwater1
1,1-DichloroethaneHealth riskSuspected carcinogen (EPA C/likely); CNS depressant. Common at solvent-contaminated sites as a degradation intermediate. (EPA, ATSDR)Sludge1
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
1,3-DichlorobenzeneHealth riskLimited human-health data; treated as a probable hepatotoxin. (EPA)Groundwater1
1,4-DichlorobenzeneHealth riskIARC Group 2B possible carcinogen; common in mothballs and air fresheners. EPA MCL 75 µg/L. (IARC, EPA)Sludge1
2,6-DinitrotolueneSludge1
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)Groundwater1
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)Sludge1
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)Groundwater1
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)Sludge1
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)Soil1
BenzeneHealth riskIARC Group 1 carcinogen. Long-term inhalation causes leukemia and bone-marrow disorders. (IARC, EPA)Groundwater1
Benzo(B)FluorantheneGroundwater1
Benzo(K)FluorantheneSoil1
Benzo[A]AnthraceneHealth riskPAH; IARC Group 2B possible carcinogen; common combustion byproduct and creosote constituent. (IARC)Groundwater1
Benzo[A]AnthraceneHealth riskPAH; IARC Group 2B possible carcinogen; common combustion byproduct and creosote constituent. (IARC)Soil1
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)Soil1
BerylliumGroundwater1
BerylliumSoil1
Bis(2-Ethylhexyl)PhthalateGroundwater1
CadmiumSludge1
CadmiumSoil1
ChloroformGroundwater1
ChloromethaneSludge1
ChromiumHealth riskHexavalent chromium (Cr-VI) is an IARC Group 1 carcinogen via inhalation, causing lung cancer; trivalent chromium is far less toxic. (IARC, EPA)Groundwater1
ChromiumHealth riskHexavalent chromium (Cr-VI) is an IARC Group 1 carcinogen via inhalation, causing lung cancer; trivalent chromium is far less toxic. (IARC, EPA)Sludge1
ChromiumHealth riskHexavalent chromium (Cr-VI) is an IARC Group 1 carcinogen via inhalation, causing lung cancer; trivalent chromium is far less toxic. (IARC, EPA)Soil1
ChryseneGroundwater1
ChryseneSoil1

Showing the top 30 pairs by SEMS citation count. 17 additional (contaminant, pathway) pairs are recorded for this site.

Drinking-water linkage · SDWIS

Groundwater Systems Serving Communities Within 3 Miles

The 18 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
Big Sky N. Subdivision PrivatePocatello2.0 mi300GROUNDWATERIn compliance
Pleasant Acres Mobile Home Park PrivatePocatello2.0 mi85GROUNDWATERUNRESOLVED
Caribou Acres PrivatePocatello2.0 mi150GROUNDWATERUNRESOLVED
D And M Water Assn PrivatePocatello2.0 mi142GROUNDWATERUNRESOLVED
Twin Pines Mobile Park PrivatePocatello2.0 mi86GROUNDWATERIn compliance
Mink Creek Mountain Estates PrivatePocatello2.0 mi27GROUNDWATERUNRESOLVED
Pocatello City Of MunicipalPocatello2.0 mi58,231GROUNDWATERUNRESOLVED
Tyhee And S And N Estates Water Assn PrivatePocatello2.0 mi300GROUNDWATERUNRESOLVED
Smith Road Water Users Assn PrivatePocatello2.0 mi58GROUNDWATERUNRESOLVED
Space Acres Water Users Assn PrivatePocatello2.0 mi29GROUNDWATERUNRESOLVED
Valley View Estates PrivatePocatello2.0 mi74GROUNDWATERUNRESOLVED
Whitewater Subd PrivatePocatello2.0 mi106GROUNDWATERUNRESOLVED
Equestrian Estates PrivatePocatello2.0 mi88GROUNDWATERIn compliance
Wildhorse Ridge Subd PrivatePocatello2.0 mi85GROUNDWATERUNRESOLVED
Sedero Subd PrivatePocatello2.0 mi30GROUNDWATERIn compliance
Chubbuck City Of MunicipalChubbuck2.5 mi15,842GROUNDWATERIn compliance
Laceys Vista Acres Water Corp PrivateChubbuck2.5 mi200GROUNDWATERIn compliance
Moreland Country Court PrivateChubbuck2.5 mi60GROUNDWATERUNRESOLVED

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 (5 Census block groups, population-weighted demographics): a population of 5,937. Why we surface this →

POPULATION SHARE
40.0%

Low-income

POPULATION SHARE
11.2%

People of color

POPULATION SHARE
7.6%

Under age 5

POPULATION SHARE
10.4%

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.