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

Koppers Co., Inc. (Texarkana Plant) Superfund

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

West 3Rd St, Texarkana, Texas · ZIP 75501 · EPA ID TXD980623904

See Bowie 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 Contaminants Are In Koppers Co., Inc. (Texarkana Plant)

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
BenzeneHealth riskIARC Group 1 carcinogen. Long-term inhalation causes leukemia and bone-marrow disorders. (IARC, EPA)Groundwater2
PentachlorophenolHealth riskIARC Group 1 carcinogen; wood preservative; persistent in soil and groundwater. (IARC, EPA)Groundwater2
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)Groundwater2
TolueneHealth riskCentral-nervous-system depressant. Chronic high exposure causes hearing loss and developmental effects. (EPA, ATSDR)Groundwater2
1,2-DihydroacenaphthyleneGroundwater1
1,2-DihydroacenaphthyleneSediment1
1,2-DihydroacenaphthyleneSoil1
1,2-DihydroacenaphthyleneSurface Water1
2-MethylnaphthaleneGroundwater1
2-MethylnaphthaleneSediment1
2-MethylnaphthaleneSoil1
2-MethylnaphthaleneSurface Water1
9H-FluoreneGroundwater1
9H-FluoreneSediment1
9H-FluoreneSoil1
9H-FluoreneSurface Water1
AcenaphthyleneGroundwater1
AcenaphthyleneSoil1
AnthraceneGroundwater1
AnthraceneSediment1
AnthraceneSoil1
AnthraceneSurface Water1
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)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)Soil1
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)Surface Water1
BenzeneHealth riskIARC Group 1 carcinogen. Long-term inhalation causes leukemia and bone-marrow disorders. (IARC, EPA)Sediment1
Benzo(B)FluorantheneGroundwater1
Benzo(B)FluorantheneSediment1
Benzo(B)FluorantheneSoil1

Showing the top 30 pairs by SEMS citation count. 59 additional (contaminant, pathway) pairs are recorded for this site.

Drinking-water linkage · SDWIS

Groundwater Systems Serving Communities Within 3 Miles

The 5 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
Leroys Mobile Home Park PrivateTexarkana2.8 mi60GROUNDWATERUNRESOLVED
Woodland Estates PrivateTexarkana2.8 mi165GROUNDWATERUNRESOLVED
Country Paradise Mobile Home & Rv Park PrivateTexarkana2.8 mi104GROUNDWATERUNRESOLVED
Cypress Brook Estates PrivateTexarkana2.8 mi81GROUNDWATERUNRESOLVED
Lakeside Estates Subdivision PrivateTexarkana2.8 mi378GROUNDWATERUNRESOLVED

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 (4 Census block groups, population-weighted demographics): a population of 2,163. Why we surface this →

POPULATION SHARE
82.7%

Low-income

POPULATION SHARE
87.2%

People of color

POPULATION SHARE
6.2%

Under age 5

POPULATION SHARE
11.6%

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.