State | City | Title | Type of Site |
|---|
 Washington | Bainbridge Island | Wyckoff Eagle Harbor | NPL |
| Washington | Bellevue | BP Tank Truck Accident - Bellevue | Oil |
| Washington | Bellingham | Oeser Company | NPL |
| Washington | Benton County | Alexander Farms, Benton County, WA | Removal |
| Washington | Bothell | Horse Creek Mystery Spill | Removal |
| Washington | Bremerton | Jackson Park Housing Complex (USNAVY) | NPL |
| Washington | Bremerton | Puget Sound Naval Shipyard Complex | NPL |
| Washington | Brush Prairie | Toftdahl Drums | Deleted NPL |
| Washington | Centralia | Centralia Municipal Landfill | NPL |
| Washington | Chehalis | American Crossarm & Conduit Co. | NPL |
| Washington | Chehalis | Hamilton-LaBree Roads GW Contamination | NPL |
| Washington | Chehalis | Coal Creek - Ross Electric | NPL Equivalent |
| Washington | Chelan | Holden Mine | Mining |
| Washington | Colbert | Colbert Landfill | NPL |
| Washington | Colville | Bonanza Mill | Site Assessment |
| Washington | Colville | Colville Post and Poles, Inc. | Removal |
| Washington | Enumclaw | Koopman Dairy | Removal |
| Washington | Everson | Nortwest Transformer (South Harkness Street) | Deleted NPL |
| Washington | Everson | Northwest Transformer (Mission Pole) | Deleted NPL |
| Washington | Fidalgo Island | PM Northwest Removal Site | Removal |
| Washington | Fort Lewis | Fort Lewis Logistics Center | NPL |
| Washington | Fort Lewis | Fort Lewis (Landfill No. 5) | Deleted NPL |
| Washington | Issaquah | Issaquah Mini-Storage Response | Response |
| Washington | Kent | Western Processing Company, Inc. | NPL |
| Washington | Kent | Midway Landfill | NPL |
| Washington | Kent | Seattle Municipal Landfill (Kent Highlands) | NPL |
| Washington | Kent | Japanese Auto Wrecking | Removal |
| Washington | Keyport | Naval Undersea Warfare Center (4 Areas) | NPL |
| Washington | Lake Tapps | Lake Tapps Abandoned Drums | Response |
| Washington | Lakewood | Lakewood Site | NPL |
| Washington | Leadpoint | Anderson-Calhoun Mine and Mill | Removal |
| Washington | Longview | Weyerhaeuser Oil Tank | Oil |
| Washington | Loomis | Silver Mountain Mine | Deleted NPL |
| Washington | Manchester | Old Navy Dump/Manchester Lab (USEPA/NOAA) | NPL |
| Washington | Maple Valley | Queen City Farms | NPL |
| Washington | Marysville | Tulalip Landfill | Deleted NPL |
| Washington | Mead | Kaiser Aluminum Mead Works | NPL |
| Washington | Mica | Mica Landfill | NPL |
| Washington | Moses Lake | Moses Lake Wellfield Contamination | NPL |
| Washington | Nighthawk | Kaaba-Texas Mine Removal, Nighthawk, WA | Removal |
| Washington | North Bonneville | Hamilton Island Landfill (USA/COE) | Deleted NPL |
| Washington | Northport | Le Roi Smelter | Removal |
| Washington | Oak Harbor | USNAVY Naval Air Station, Whidbey Island (Ault) | NPL |
| Washington | Oak Harbor | USNAVY Naval Air Station, Whidbey Island (Seaplane) | Deleted NPL |
| Washington | Pasco | Pasco Sanitary Landfill | NPL |
| Washington | Port Hadlock | USNAVY Port Hadlock Detachment Naval Ordnance Ctr Pac Div | NPL |
| Washington | Puyallup | Hidden Valley Landfill (Thun Field) | NPL |
| Washington | Reardan | Euclid Road Groundwater Site | Removal |
| Washington | Renton | Pacific Car and Foundry (PACCAR) | NPL |
| Washington | Renton | Olympic Pipeline Sample Line Gasoline Spill | Oil |
| Washington | Renton | Quendall Terminals | Site Assessment |
| Washington | Richland | Hanford - Washington | NPL |
| Washington | Richland | Hanford 1100-Area (USDOE) | Deleted NPL |
| Washington | Richland | Hanford 300-Area (USDOE) | NPL |
| Washington | Richland | Hanford 200-Area (USDOE) | NPL |
| Washington | Richland | Hanford 100-Area (USDOE) | NPL |
| Washington | SeaTac | SeaTac Oilspill | Oil |
| Washington | Seattle | Harbor Island (Lead) | NPL |
| Washington | Seattle | Pacific Sound Resources | NPL |
| Washington | Seattle | Malarkey Asphalt Company | Removal |
| Washington | Seattle | West Waterway Tributyltin (TBT) | Part of NPL site |
| Washington | Seattle | Lower Duwamish Waterway Site | NPL |
| Washington | Seattle | Rhone-Poulenc Incorporated | RCRA CA |
| Washington | Seattle | Lake Washington Dry Docks | Response |
| Washington | Seattle | Lockheed West Seattle | NPL |
| Washington | Seattle | Boeing Electronics Manufacturing Facility (EMF) Superfund Site | Removal |
| Washington | Seattle | Basin Oil | Removal Assessment |
| Washington | Seattle, Washington | Jorgensen Forge Superfund Site | Part of NPL site |
| Washington | Silverdale | Bangor Naval Submarine Base | NPL |
| Washington | Silverdale | Bangor Ordnance Disposal (USNAVY) | NPL |
| Washington | Skyway | Junior's Trucking Tire Fire | Response |
| Washington | Spokane | Spokane Junkyard and Associated Properties | Deleted NPL |
| Washington | Spokane | Fairchild Air Force Base (4 Waste Areas) | NPL |
| Washington | Spokane | Old Inland Pit | NPL |
| Washington | Spokane | Greenacres Landfill | NPL |
| Washington | Spokane | General Electric Co. (Spokane Shop) | NPL |
| Washington | Spokane | Northside Landfill | NPL |
| Washington | Spokane | North Market Street | NPL |
| Washington | Spokane | Vermiculite Northwest - Spokane WA | Site Assessment |
| Washington | Tacoma | CleanCare Removal Site | Removal |
| Washington | Tacoma | Tacoma Tarpits | Part of NPL site |
| Washington | Tacoma | Commencement Bay-South Tacoma Channel | NPL |
| Washington | Tacoma | Commencement Bay-Nearshore Tideflats | NPL |
| Washington | Tacoma | USAF McChord AFB American Lake Gardens | NPL |
| Washington | Tacoma | USAF McChord Air Force Base (Wash Rack Treatment Area) | Deleted NPL |
| Washington | Tacoma | Asarco Smelter - Ruston | Part of NPL site |
| Washington | Tacoma | Hylebos Waterway | Part of NPL site |
| Washington | Tacoma | Thea Foss, Wheeler-Osgood Waterway | Part of NPL site |
| Washington | Tacoma | US Oil Jet Fuel Spill | Oil |
| Washington | Tacoma | Thea Foss Abandoned Drums | Removal |
| Washington | Tacoma | Olympic View Removal Action and Monitoring | Part of NPL site |
| Washington | Tacoma WA | Middle Waterway | Part of NPL site |
| Washington | Tumwater | Palermo Well Field Groundwater Contamination | NPL |
| Washington | Twisp | Alder Gold and Copper Mill | Removal |
| Washington | Vancouver | Vancouver Water Station #1 Contamination | NPL |
| Washington | Vancouver | USDOE BPA Ross Complex | Deleted NPL |
| Washington | Vancouver | Boomsnub-AIRCO | NPL |
| Washington | Vancouver | Alcoa Smelter | Deleted NPL |
| Washington | Vancouver | Frontier Hard Chrome, Inc. | NPL |
| Washington | Vancouver | Vancouver Water Station #4 Contamination | NPL |
| Washington | Vancouver | Boomsnub 2001 Removal | Removal |
| Washington | Vancouver | Camp Bonneville | BRAC |
| Washington | Vancouver | Dorothy Avenue Mercury Site | Response |
| Washington | Wellpinit | Midnite Mine | NPL |
| Washington | Whatcom County | Swift Creek Asbestos Site | Site Assessment |
| Washington | Whatcom County | Sumas Mountain Asbestos Documents | Site Assessment |
| Washington | Yakima | FMC Corp. (Yakima Pit) | NPL |
| Washington | Yakima | Yakima Plating Company | Deleted NPL |
| Washington | Yakima | Pesticide Lab (Yakima) | Deleted NPL |
| Washington | Yakima | Yakima Reservation Pesticide Dump | Response |
| Washington | Yakima | Yakima Residential Mercury Release | Response |
| Washington | | Brownfields and Washington state | Brownfields |
| Washington | | Upper Columbia River | Remedial |
| Washington | | RCRA Corrective Action Sites in Washington | RCRA CA |
| Washington | | Grandview Pesticide Fire | Removal |