King County, WA
The federal environmental record for King County (population 2,271,380): what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.
10
Superfund NPL sites
25
federal cleanup sites
9
PFAS-detecting water systems
61
TRI facilities
1,041
open tank releases
Superfund NPL sites
| Site | City | Status | Listed |
|---|---|---|---|
| Harbor Island (Lead) | Seattle | on the NPL | 09/08/1983 |
| Lockheed West Seattle | Seattle | on the NPL | 03/07/2007 |
| Lower Duwamish Waterway | Seattle | on the NPL | 09/13/2001 |
| Midway Landfill | Kent | on the NPL | 06/10/1986 |
| Pacific Car & Foundry Co. | Renton | on the NPL | 02/21/1990 |
| Pacific Sound Resources | Seattle | on the NPL | 05/31/1994 |
| Queen City Farms | Maple Valley | on the NPL | 09/21/1984 |
| Quendall Terminals | Renton | on the NPL | 04/19/2006 |
| Seattle Municipal Landfill (Kent Highlands) | Kent | on the NPL | 08/30/1990 |
| Western Processing Co., Inc. | Kent | on the NPL | 09/08/1983 |
Drinking water: PFAS testing
Public water systems serving King with at least one PFAS detection under UCMR5. The federal limit for PFOA and PFOS is 4 ng/L; EPA proposed in May 2026 to rescind the limits for the other compounds, which are shown for information.
| System | Highest results | Reading |
|---|---|---|
| SAMMAMISH PLATEAU WATER & SEWER WA5340900 | PFHxS: 16.5 ng/L PFOS: 11.1 ng/L PFBS: 8.8 ng/L | above final limit |
| COVINGTON WATER DISTRICT WA5341650 | PFBS: 14 ng/L PFOS: 8.6 ng/L PFHxS: 7.5 ng/L | above final limit |
| LAKEHAVEN WATER AND SEWER DISTRICT WA5341997 | PFPeA: 13.7 ng/L PFHxA: 7.6 ng/L PFHxS: 5.8 ng/L | above final limit |
| REDMOND WATER SYSTEM CITY OF WA5371650 | PFBS: 5 ng/L PFOS: 5 ng/L | above final limit |
| Auburn City of WA5303350 | PFBS: 4.1 ng/L | detected |
| KENT WATER DEPARTMENT WA5338150 | PFBS: 3.5 ng/L | detected |
| CEDAR RIVER WATER & SEWER DISTRICT WA5341800 | PFBA: 12.2 ng/L | detected |
| PACIFIC, CITY OF WA5365300 | PFBS: 8.3 ng/L | detected |
| RENTON CITY OF WA5371850 | PFBS: 3 ng/L | detected |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
61 facilities in King filed TRI reports for 2024, totalling 771k lb released. The 25 largest by volume:
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| NUCOR STEEL SEATTLE INC | SEATTLE | Manganese And Manganese Compounds, Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region) | 281k lb |
| WESTERN PNEUMATIC TUBE CO LLC | KIRKLAND | 1-Bromopropane, Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 150k lb |
| BOEING COMMERCIAL AIRPLANES - AUBURN | AUBURN | Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region), Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 46k lb |
| BOEING COMMERCIAL AIRPLANE GROUP - RENTON | RENTON | Toluene, Methyl isobutyl ketone | 43k lb |
| PUGET SOUND COATINGS | SEATTLE | Xylene (mixed isomers), Toluene | 35k lb |
| DARIGOLD - ISSAQUAH | ISSAQUAH | Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 30k lb |
| GROUP 14 TECHNOLOGIES INC | WOODINVILLE | Trade Secret | 17k lb |
| UNIVAR SOLUTIONS USA | KENT | Tetrachloroethylene, Methanol | 16k lb |
| SKILLS INC | AUBURN | Chromium compounds (except for chromite ore mined in the Transvaal Region), Nitric acid | 16k lb |
| REXAM BEVERAGE CAN CO RE: KENT WA FACILITY | KENT | Certain glycol ethers | 14k lb |
| ASKO PROCESSING INC | SEATTLE | 1-Bromopropane, Lead And Lead Compounds | 13k lb |
| BOEING COMMERCIAL AIRPLANE GROUP NORTH BOEING FIELD | SEATTLE | Methyl isobutyl ketone, Diethanolamine | 12k lb |
| VIGOR SHIPYARDS INC-SEATTLE | SEATTLE | Xylene (mixed isomers) | 12k lb |
| RANGER TUGS KENT | KENT | Styrene | 9k lb |
| GLACIER NORTHWEST INC EAST MARGINAL WAY PLANT | SEATTLE | Nitrate compounds (water dissociable; reportable only when in aqueous solution), Lead And Lead Compounds | 8k lb |
| FLUID MOTION LLC | AUBURN | Styrene | 7k lb |
| SOUND PROPELLER SERVICES INC | SEATTLE | Chromium, Nickel | 7k lb |
| TEREX WASHINGTON SOUTH CAMPUS | REDMOND | Manganese, Certain glycol ethers | 6k lb |
| DAVIS WIRE CORP | KENT | Lead And Lead Compounds | 6k lb |
| EMERALD SERVICES INC | SEATTLE | Ethylene glycol, Polycyclic aromatic compounds | 5k lb |
| HYTEK FINISHES CO | KENT | Lead, Nitric acid | 5k lb |
| NORTHWEST BUILDING TECH INC | SEATTLE | Ethylbenzene, Methanol | 5k lb |
| SHELL SEATTLE DISTRIBUTION TERMINAL | SEATTLE | Ethylene, Toluene | 4k lb |
| DARIGOLD-RAINIER | SEATTLE | Nitrate compounds (water dissociable; reportable only when in aqueous solution), Peracetic acid | 4k lb |
| NORTH STAR CASTEEL PRODUCTS INC | SEATTLE | Manganese compounds, Chromium compounds (except for chromite ore mined in the Transvaal Region) | 3k lb |
Underground fuel tanks
EPA's UST Finder records 3,932 tank facilities in King: 2,118 tanks in service and 10,413 closed. 1,088 fuel releases are on record, of which 1,041 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps King as Zone 3, the lowest predicted indoor radon (under 2 pCi/L average). Radon and air quality are covered in depth on lung.com.
The record for one specific address
County figures blur what matters: distance. The Address Environmental Report runs these same federal datasets against one address and reports every site, tank, polluter and water result around it, with distances, in about a minute.
Get the report - $39All federal cleanup sites on file
The wider Superfund enterprise inventory (SEMS) for King, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- EAST RENTON DRUM SITERENTON
- GUNSHY MANORREDMOND
- HARBOR ISLAND (LEAD)SEATTLE
- LOCKHEED SHIPBUILDINGSEATTLE
- LOCKHEED WEST SEATTLESEATTLE
- LOWER DUWAMISH WATERWAYSEATTLE
- MAY CREEK LANDFILLRENTON
- MIDWAY LANDFILLKENT
- QUEEN ANNE LEAD PAINT SITESEATTLE
- QUEEN CITY FARMSMAPLE VALLEY
- QUENDALL TERMINALSRENTON
- SEAFAB METALSSEATTLE
- SUPERVALU AMMONIA RESPONSETACOMA
- USARMY NGB KENTKENT
- USCG ALKI POINT LIGHTHOUSESEATTLE
- USDA FS MT. BAKER-SNOQUALMIE NF: CASHMAN MILL/APEX MILL SIBARING
- USDA FS MT. BAKER-SNOQUALMIE NF: RAINY MINE & MILL SITENORTH BEND
- USDOHS TSA SEATAC AIRPORTSEATTLE
- USPS FEDERAL WAY FACILITYFEDERAL WAY
- VALUE PLATING AND METAL POLISHSEATTLE
- VILLA BONITA APARTMENTS MERCURYKIRKLAND
- WA ARMY NATIONAL GUARD REDREDMOND
- WASHINGTON NATURAL GAS - SEATTLE PLANTSEATTLE
- WEYERHAEUSER SEATTLE LAB-UNDEV PROP ADJASEATTLE
- WEYERHAEUSER SNOQUALIMIE MILL SITESNOQUALMIE