Lower Duwamish Waterway
NPL SiteSeattle, WA
According to the EPA Superfund Enterprise Management System, Lower Duwamish Waterway in Seattle, WA is listed with NPL status NPL Site. Its Hazard Ranking System (HRS) score is 50.00. The public extract catalogs 49 contaminant records for this site. NPL listing is a cleanup-authority designation, not a measured health-risk score.
Superfund National Priorities List inclusion (status and HRS score shown above) is the EPA's formal designation that a contaminated site qualifies for long-term federal cleanup authority under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA). A federal-facility classification means the site is owned or operated by a federal agency, which routes cleanup responsibility differently than a privately owned site.
"Construction Complete" (status shown above) is an EPA milestone marking that the physical remedy work is finished, not that the site has exited EPA oversight; long-term monitoring can continue afterward. Deletion from the NPL is a separate, later step the EPA takes only once it determines every planned response action is finished.
NPL listing is a cleanup-authority designation in the EPA record, not a quantitative health-risk score. HRS scores of 28.50 or above qualify a site for the NPL under the EPA screening model (toxicity, pathways, waste quantity, and affected population factors). For current site conditions and official community notices, see the EPA Regional Superfund profile and the Washington environmental agency.
What is the cleanup status of this Superfund site?
Contaminants
| Contaminant | Media |
|---|---|
| 1,2,4-TRICHLOROBENZENE | Sediment |
| 1,2-DICHLOROBENZENE | Sediment |
| 1,2-DIHYDROACENAPHTHYLENE | Sediment |
| 1,4-DICHLOROBENZENE | Sediment |
| 2,4-DIMETHYLPHENOL | Sediment |
| 2-METHYLNAPHTHALENE | Sediment |
| 4-METHYLPHENOL (P-CRESOL) | Sediment |
| 9H-FLUORENE | Sediment |
| ANTHRACENE | Sediment |
| ARSENIC | Fish Tissue |
| ARSENIC | Sediment |
| BENZO(B)FLUORANTHENE | Sediment |
| BENZO(GHI)PERYLENE | Sediment |
| BENZO(K)FLUORANTHENE | Sediment |
| BENZO[A]ANTHRACENE | Sediment |
| BENZO[A]PYRENE | Sediment |
| BENZOIC ACID | Sediment |
| BIS(2-ETHYLHEXYL)PHTHALATE | Sediment |
| BUTYL BENZYL PHTHALATE | Sediment |
| CADMIUM | Sediment |
| CARCINOGENIC POLYCYCLIC AROMATIC HYDROCARBONS (cPAH) | Fish Tissue |
| CARCINOGENIC POLYCYCLIC AROMATIC HYDROCARBONS (cPAH) | Sediment |
| CHLORINATED DIOXINS AND FURANS | Fish Tissue |
| CHLORINATED DIOXINS AND FURANS | Sediment |
| CHROMIUM | Sediment |
| CHRYSENE | Sediment |
| COPPER | Sediment |
| DIBENZO(A,H)ANTHRACENE | Sediment |
| DIBENZOFURAN | Sediment |
| DIMETHYL PHTHALATE | Sediment |
| FLUORANTHENE | Sediment |
| HEXACHLOROBENZENE | Sediment |
| INDENO(1,2,3-CD)PYRENE | Sediment |
| LEAD | Sediment |
| MERCURY | Sediment |
| N,N-DIPHENYLNITROUS AMIDE | Sediment |
| NAPHTHALENE | Sediment |
| PENTACHLOROPHENOL | Sediment |
| PHENANTHRENE | Sediment |
| PHENOL | Sediment |
| PHENYLMETHANOL | Sediment |
| POLYCHLORINATED BIPHENYLS (PCBs) | Fish Tissue |
| POLYCHLORINATED BIPHENYLS (PCBs) | Sediment |
| POLYCYCLIC AROMATIC HYDROCARBONS, HIGH MOLECULAR WEIGHT (HPAHS) | Sediment |
| POLYCYCLIC AROMATIC HYDROCARBONS, LOW MOLECULAR WEIGHT (LPAHS) | Sediment |
| PYRENE | Sediment |
| SILVER | Sediment |
| TOTAL BENZOFLUORANTHENES | Sediment |
| ZINC | Sediment |
Location
Other Superfund Sites in Washington
| Site Name | Status | HRS Score |
|---|---|---|
| ALCOA (Vancouver Smelter) | Deleted NPL Site | 57.80 |
| American Crossarm & Conduit Co. | Deleted NPL Site | 30.44 |
| American Lake Gardens/McChord AFB | NPL Site | 28.90 |
| Bangor Naval Submarine Base | NPL Site | 55.91 |
| Bangor Ordnance Disposal (USNAVY) | NPL Site | 30.42 |
| Bonneville Power Administration Ross Complex (USDOE) | Deleted NPL Site | 53.67 |
| Boomsnub/Airco | NPL Site | 0.00 |
| Bremerton Gasworks | NPL Site | 50.00 |
| Centralia Municipal Landfill | NPL Site | 36.36 |
| Colbert Landfill | NPL Site | 41.59 |
How does this site's HRS score compare in Washington?
Of the 69 Washington Superfund sites with a scored Hazard Ranking System (HRS) evaluation, Lower Duwamish Waterway ranks #20 by score (50.00).
Either side of it: Jackson Park Housing Complex (USNAVY) (50.00), Lockheed West Seattle (50.00), Makah Reservation Warmhouse Beach Dump (50.00), Midnite Mine (50.00)
Frequently Asked Questions
What is the Lower Duwamish Waterway Superfund site? ▼
What does NPL listing mean for Lower Duwamish Waterway? ▼
What is the HRS score for Lower Duwamish Waterway? ▼
What contaminants are at the Lower Duwamish Waterway site? ▼
What is the cleanup status of Lower Duwamish Waterway? ▼
NPL listing is a cleanup-authority designation in the EPA record, not a quantitative health-risk score. See Superfund Sites Explained for how the National Priorities List, Hazard Ranking System, and cleanup phases work.
Read our methodology - how this data is sourced, computed, and verified.