Snohomish County, WA
The federal environmental record for Snohomish County (population 844,761): what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.
1
Superfund NPL sites
9
federal cleanup sites
2
PFAS-detecting water systems
24
TRI facilities
236
open tank releases
Superfund NPL sites
| Site | City | Status | Listed |
|---|---|---|---|
| Tulalip Landfill | Marysville | deleted | 04/25/1995 |
Drinking water: PFAS testing
Public water systems serving Snohomish 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 |
|---|---|---|
| ARLINGTON WATER DEPT WA5302950 | PFHxS: 4.9 ng/L | detected |
| CROSS VALLEY WATER DISTRICT WA5316270 | PFBS: 9.4 ng/L PFHxA: 6.4 ng/L PFPeA: 4.9 ng/L | detected |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
24 facilities in Snohomish filed TRI reports for 2024, totalling 252k lb released.
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| CEPHEID - BOTHELL | BOTHELL | Acetonitrile, Dichloromethane | 99k lb |
| BOEING COMMERCIAL AIRPLANES - EVERETT | EVERETT | Methyl isobutyl ketone, Certain glycol ethers | 78k lb |
| FLUID MOTION LLC | ARLINGTON | Styrene | 33k lb |
| C&D ZODIAC INC | MARYSVILLE | Phenol, Methanol | 19k lb |
| ABW TECHNOLOGIES | ARLINGTON | n-Butyl alcohol, Xylene (mixed isomers) | 9k lb |
| FLUID MOTION LLC | MONROE | Styrene | 5k lb |
| SR SMITH LLC | ARLINGTON | Styrene | 4k lb |
| US NAVAL STATION EVERETT | EVERETT | Lead, Perfluorooctanoic acid | 3k lb |
| ACHILLES USA INC | EVERETT | Antimony compounds, Di(2-ethylhexyl) phthalate | 1k lb |
| MOREL INDUSTRIES INC. | ARLINGTON | Copper And Copper Compounds | 750 lb |
| GRANITE CONSTRUCTION CO | EVERETT | Polycyclic aromatic compounds, Benzo[g,h,i]perylene | 547 lb |
| ROMAC INDUSTRIES | SULTAN | Nickel, Lead | 440 lb |
| UNIVERSITY SWAGING CORP | WOODINVILLE | Chromium | 152 lb |
| ELDEC AEROSPACE CORP | LYNNWOOD | Lead | 51 lb |
| BLUE ORIGIN LLC (BLUE CASTINGS) | ARLINGTON | Chromium, Nickel | 30 lb |
| SEACAST MARYSVILLE | MARYSVILLE | Chromium compounds (except for chromite ore mined in the Transvaal Region), Nickel compounds | 10 lb |
| ROMAC INDUSTRIES INC | BOTHELL | Chromium, Nickel | 6 lb |
| SEATTLE GALVANIZING CO INC | ARLINGTON | Zinc compounds | 5 lb |
| AEROSPACE MANUFACTURING TECHNOLOGIES | ARLINGTON | - | 0 lb |
| AVTECHTYEE | EVERETT | - | 0 lb |
| CPC MATERIALS INC. ARLINGTON | ARLINGTON | - | 0 lb |
| AD SYSTEMS | EVERETT | - | 0 lb |
| STELLA-JONES CORP | ARLINGTON | Polycyclic aromatic compounds | 0 lb |
| RANGER TUGS MONROE R | MONROE | - | 0 lb |
Underground fuel tanks
EPA's UST Finder records 1,163 tank facilities in Snohomish: 805 tanks in service and 2,767 closed. 251 fuel releases are on record, of which 236 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps Snohomish 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 Snohomish, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- AMOUR FIBERSULTAN
- BOEING COMPANY TULALIP TEST SITEMARYSVILLE
- EVERETT SMELTEREVERETT
- SISCO LANDFILLARLINGTON
- TULALIP LANDFILLMARYSVILLE
- USDA FS MT BAKER-SNOQUALMI NF: KROMONA MINE & MILLSULTAN
- USDA FS MT BAKER-SNOQUALMIE NF: SUNSET MINE & MILL SITEINDEX
- USDOD DLA MUKILTEO DEFENSE FUEL SUPPORTMUKILTEO
- WA AIR NATIONAL GUARD PAINE FLD N PARCELEVERETT