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

Hanford 200-Area (Usdoe)

This site is currently on the EPA Superfund National Priorities List and remains under federal cleanup oversight. Most-cited contaminant of concern: Technetium-99.

200 Area, Benton County, Washington · ZIP 99352 · EPA ID WA1890090078

See Benton 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
Technetium-99Groundwater4
UraniumHealth riskIARC Group 1 carcinogen; chemical kidney toxicity exceeds the radiological risk at most environmental levels. EPA MCL 30 µg/L total uranium. (IARC, EPA)Groundwater4
Carbon TetrachlorideHealth riskIARC Group 2B possible carcinogen; liver toxic. EPA MCL 5 µg/L. Banned for most uses since 1986. (IARC, EPA)Groundwater3
Americium-241Health riskIARC Group 1 carcinogen (alpha emitter, half-life ~432 yr for Am-241); produced in nuclear reactors and weapons. (IARC, EPA)Debris2
Cesium-137Health riskBeta/gamma emitter (half-life ~30 yr); whole-body irradiator; legacy of nuclear weapons fallout and reactor accidents. (EPA)Debris2
ChromiumHealth riskHexavalent chromium (Cr-VI) is an IARC Group 1 carcinogen via inhalation, causing lung cancer; trivalent chromium is far less toxic. (IARC, EPA)Groundwater2
Chromium(Vi)Health riskHexavalent chromium (Cr-VI) is an IARC Group 1 carcinogen via inhalation, causing lung cancer; trivalent chromium is far less toxic. (IARC, EPA)Groundwater2
Iodine-129Groundwater2
NitrateHealth riskDrinking-water nitrate causes methemoglobinemia ('blue-baby syndrome') in infants; EPA MCL is 10 mg/L as N. (EPA)Groundwater2
Plutonium-239/240Debris2
Strontium-90Health riskBeta emitter (half-life ~29 yr); bone-seeking — chemically mimics calcium; legacy of nuclear weapons fallout. (EPA, ATSDR)Debris2
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)Groundwater2
TritiumHealth riskHydrogen-3 (beta emitter, half-life ~12.3 yr); travels with water and is hard to remove from groundwater. EPA MCL 20,000 pCi/L. (EPA)Groundwater2
AcetoneHealth riskLow chronic toxicity; high acute exposure causes CNS depression and respiratory irritation. (EPA, NIOSH)Leachate1
AluminumHealth riskInhaled aluminum fumes can cause lung scarring (aluminosis); high cumulative exposure has been linked to neurological effects. (NIOSH)Leachate1
Americium-241Health riskIARC Group 1 carcinogen (alpha emitter, half-life ~432 yr for Am-241); produced in nuclear reactors and weapons. (IARC, EPA)Sludge1
Americium-241Health riskIARC Group 1 carcinogen (alpha emitter, half-life ~432 yr for Am-241); produced in nuclear reactors and weapons. (IARC, EPA)Soil1
AmmoniaHealth riskSevere respiratory and eye irritant; high concentrations cause chemical burns to lung tissue. (EPA)Leachate1
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)Leachate1
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)Leachate1
BerylliumLeachate1
Bis(2-Ethylhexyl)PhthalateLeachate1
BoronDebris1
BoronSoil1
Butyl Benzyl PhthalateLeachate1
Carbon TetrachlorideHealth riskIARC Group 2B possible carcinogen; liver toxic. EPA MCL 5 µg/L. Banned for most uses since 1986. (IARC, EPA)Debris1
Carbon TetrachlorideHealth riskIARC Group 2B possible carcinogen; liver toxic. EPA MCL 5 µg/L. Banned for most uses since 1986. (IARC, EPA)Soil1
Cesium-137Health riskBeta/gamma emitter (half-life ~30 yr); whole-body irradiator; legacy of nuclear weapons fallout and reactor accidents. (EPA)Soil1
ChlorideLeachate1
ChloroformGroundwater1

Showing the top 30 pairs by SEMS citation count. 26 additional (contaminant, pathway) pairs are recorded for this site.

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

Benton County, Washington (no Census block groups within 1 mile and no host city — falling back to containing county): a population of 207,560. Why we surface this →

POPULATION SHARE
10.5%

Low-income

POPULATION SHARE
32.6%

People of color

POPULATION SHARE
8.0%

Under age 5

POPULATION SHARE
15.4%

Over age 64

Source: Census ACS 2018-2022 (5-year) + USEPA-clone EJ blockgroup stats (raw indicators + EJ disparity mirror). 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.