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

Portland Harbor

This site is currently on the EPA Superfund National Priorities List and remains under federal cleanup oversight. Most-cited contaminant of concern: 1,1-Dichloroethene.

Between Rm 1.9 And 11.8 In Portland, Portland, Oregon · ZIP 97231 · EPA ID ORSFN1002155

See Multnomah 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-DichloroetheneHealth riskVinylidene chloride; IARC Group 3 (inadequate evidence in humans) but liver toxic in animal studies; common TCE/PCE biodegradation product. (IARC, EPA)Fish Tissue1
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
1,1-DichloroetheneHealth riskVinylidene chloride; IARC Group 3 (inadequate evidence in humans) but liver toxic in animal studies; common TCE/PCE biodegradation product. (IARC, EPA)Sediment1
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)Surface Water1
1,2,3,4,7,8-Hexachlorodibenzofuran (Hxcdf)Fish Tissue1
1,2,3,4,7,8-Hexachlorodibenzofuran (Hxcdf)Groundwater1
1,2,3,4,7,8-Hexachlorodibenzofuran (Hxcdf)Sediment1
1,2,3,4,7,8-Hexachlorodibenzofuran (Hxcdf)Surface Water1
1,2,3,7,8-Pentachlorodibenzo[B,E][1,4]Dioxin (Pecdd)Fish Tissue1
1,2,3,7,8-Pentachlorodibenzo[B,E][1,4]Dioxin (Pecdd)Groundwater1
1,2,3,7,8-Pentachlorodibenzo[B,E][1,4]Dioxin (Pecdd)Sediment1
1,2,3,7,8-Pentachlorodibenzo[B,E][1,4]Dioxin (Pecdd)Surface Water1
1,2-Dichloroethene (Cis And Trans Mixture)Groundwater1
1,2-DihydroacenaphthyleneFish Tissue1
1,2-DihydroacenaphthyleneGroundwater1
1,2-DihydroacenaphthyleneSediment1
1,2-DihydroacenaphthyleneSurface Water1
2,3,4,7,8-Pentachlorodibenzofuran (Pecdf)Fish Tissue1
2,3,4,7,8-Pentachlorodibenzofuran (Pecdf)Groundwater1
2,3,4,7,8-Pentachlorodibenzofuran (Pecdf)Sediment1
2,3,4,7,8-Pentachlorodibenzofuran (Pecdf)Surface Water1
2,3,7,8-Tetrachlorodibenzo-P-Dioxin (Tcdd)Fish Tissue1
2,3,7,8-Tetrachlorodibenzo-P-Dioxin (Tcdd)Groundwater1
2,3,7,8-Tetrachlorodibenzo-P-Dioxin (Tcdd)Sediment1
2,3,7,8-Tetrachlorodibenzo-P-Dioxin (Tcdd)Surface Water1
2,3,7,8-Tetrachlorodibenzo-P-Dioxin (Tcdd) Toxicity Equivalents (Teq)Fish Tissue1
2,3,7,8-Tetrachlorodibenzo-P-Dioxin (Tcdd) Toxicity Equivalents (Teq)Groundwater1
2,3,7,8-Tetrachlorodibenzo-P-Dioxin (Tcdd) Toxicity Equivalents (Teq)Sediment1
2,3,7,8-Tetrachlorodibenzo-P-Dioxin (Tcdd) Toxicity Equivalents (Teq)Surface Water1
2,3,7,8-TetrachlorodibenzofuranFish Tissue1

Showing the top 30 pairs by SEMS citation count. 229 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

Portland, Oregon (no Census block groups within 1 mile — falling back to host city; disparity scores aggregated by centroid containment): a population of 646,101. Why we surface this →

POPULATION SHARE
12.2%

Low-income

POPULATION SHARE
31.7%

People of color

POPULATION SHARE
4.8%

Under age 5

POPULATION SHARE
14.0%

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.