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Snohomish County, Washington: environmental and disease records

Cancer mortality in Snohomish County is 148.2 deaths per 100,000 people per year against a U.S. rate of 143.2, a statistically significant excess. The strongest disease signals are Bladder deaths at 1.2 times the U.S. rate and Liver & bile duct deaths at 1.1 times the U.S. rate. Federal databases place 1,805 regulated facilities, sites and hazards inside the county, led by NPDES wastewater discharge permit (846), Gas station (mapped facility) (237), Auto repair or body shop (mapped facility) (160). 2 correctional facilities operate in the county. EPA AirToxScreen estimates a lifetime cancer risk from outdoor air toxics of 30 in a million, driven mainly by formaldehyde.

Rates are age-adjusted per 100,000 people. A cancer signal is marked significant when the lower bound of its 95 percent confidence interval is above the U.S. rate. Facility counts use active federal records located inside the county boundary. Approximate county center: 48.0382, -121.7034.

How this county ranks in Washington

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Cancer deaths and new cases versus the United States

Source: NCI and CDC State Cancer Profiles, both sexes, all ages. Sorted by the ratio of the county rate to the U.S. rate.

Cancer rates for Snohomish County compared with the United States
CancerMeasureCounty rateU.S. rateTimes U.S.95% intervalYears
Melanoma of the skinNew cases31.923.81.34xSignificant30.2 to 33.62019-2023
Childhood cancer (under 15)Deaths2.31.91.21x1.4 to 3.72020-2024
ThyroidDeaths0.60.51.2x0.4 to 0.92020-2024
BladderDeaths4.94.11.2xSignificant4.2 to 5.62020-2024
LeukemiaNew cases17.214.51.19xSignificant15.9 to 18.52019-2023
Non-Hodgkin lymphomaDeaths5.54.81.15x4.8 to 6.22020-2024
BladderNew cases21.318.71.14xSignificant19.9 to 22.72019-2023
Liver & bile ductDeaths7.46.61.12xSignificant6.7 to 8.32020-2024
StomachNew cases7.36.61.11x6.5 to 8.12019-2023
Liver & bile ductNew cases9.68.71.1xSignificant8.8 to 10.62019-2023
Melanoma of the skinDeaths2.221.1x1.8 to 2.72020-2024
Brain & nervous systemNew cases6.86.21.1x6 to 7.62019-2023
ThyroidNew cases14.1131.08x13 to 15.32019-2023
Non-Hodgkin lymphomaNew cases19.818.51.07xSignificant18.6 to 21.22019-2023
Brain & nervous systemDeaths4.74.41.07x4.1 to 5.32020-2024
All cancerNew cases478.2453.41.05xSignificant471.8 to 484.72019-2023
EsophagusDeaths3.93.71.05x3.3 to 4.52020-2024
LeukemiaDeaths65.71.05x5.3 to 6.82020-2024
EsophagusNew cases4.84.61.04x4.2 to 5.52019-2023
All cancerDeaths148.2143.21.03xSignificant144.6 to 151.82020-2024
Lung & bronchusNew cases51.251.80.99x49.1 to 53.42019-2023
PancreasNew cases13.713.90.99x12.7 to 14.92019-2023
Childhood cancer (under 15)New cases16.116.40.98x13.4 to 19.22019-2023
StomachDeaths2.62.70.96x2.2 to 3.22020-2024
Lung & bronchusDeaths2930.20.96x27.5 to 30.72020-2024
PancreasDeaths10.711.30.95x9.7 to 11.72020-2024
Kidney & renal pelvisDeaths33.40.88x2.5 to 3.52020-2024
Kidney & renal pelvisNew cases14.617.90.82x13.5 to 15.72019-2023

Mortality measures versus the U.S. county median

Source: County Health Rankings, built from CDC National Vital Statistics System death records. The comparison value is the median of all U.S. counties.

Mortality measures for Snohomish County
MeasureCountyU.S. medianDifferenceUnit
Premature death6,059.29,842.6-38%years of life lost before age 75 per 100,000
Life expectancy79.375.3+5%years
Child mortality35.559.8-41%deaths under age 18 per 100,000
Infant mortality3.66.2-42%deaths under age 1 per 1,000 live births
Injury deaths75.996.9-22%deaths per 100,000
Drug overdose deaths29.428.6+3%deaths per 100,000

Air toxics and air quality

EPA AirToxScreen 2020

Lifetime cancer risk from outdoor air toxics: 30 in a million. EPA treats 100 in a million as the upper end of acceptable risk and 1 in a million as the goal.

  • Formaldehyde17.01 per million
  • Naphthalene4.17 per million
  • Carbon Tetrachloride3.01 per million
  • Acetaldehyde2.88 per million

EPA Air Quality Index 2025

Monitored on 365 days: 248 good, 1 unhealthy for sensitive groups or worse. Median AQI 41, peak 125.

Regulated facilities, sites and hazards by type

1,805 active records inside the county from EPA ECHO, TRI, Superfund, Brownfields, NPDES, EIA, FAA, FRA and corrections data.

  • NPDES wastewater discharge permit846
  • Gas station (mapped facility)237
  • Auto repair or body shop (mapped facility)160
  • Rail grade crossing137
  • Small hazardous waste generator90
  • Air permit holder (minor source)89
  • Large hazardous waste generator60
  • Dry cleaner (mapped facility)30
  • Toxic chemical release facility (TRI)30
  • Brownfield property25
  • TRI reporting facility25
  • Heliport11
  • Wastewater plant (mapped facility)11
  • Public airport9
  • Major air pollution source8
  • Hazardous waste transporter8
  • Scrapyard (mapped facility)8
  • EPA air quality monitor4
  • Large greenhouse gas emitter4
  • Landfill (mapped facility)4
  • Commercial airport2
  • Correctional facility (prison or jail)2
  • Hydroelectric plant2
  • Battery storage plant1
  • Biomass power plant1
  • Solar power plant1

Highest-severity records

The 25 records with the highest Envyrofax severity in the county, with the agency identifier to cite in a records request.

  1. Boeing Everett, Everett

    TRI reporting facility. Penalties $8,575.

    EPA FRS registry ID 110017406788 (U.S. EPA ECHO) Agency record

    Severity 10

  2. C And D Zodiac Corp Marysville, Marysville

    TRI reporting facility.

    EPA FRS registry ID 110000490184 (U.S. EPA ECHO) Agency record

    Severity 9

  3. Us Naval Station Everett, Everett

    Toxic chemical release facility (TRI). Chemicals: Lead, Perfluorooctanoic acid. Reports carcinogens. Reports PFAS. 4,736 lbs released over 5 years.

    TRI facility ID 9820WSNVLS2WMAR (U.S. EPA Toxics Release Inventory)

    Severity 8.8

  4. Boeing Commercial Airplanes - Everett, Everett

    Toxic chemical release facility (TRI). Chemicals: Methyl isobutyl ketone, Toluene, Certain glycol ethers, N-Methyl-2-pyrrolidone and 4 more. Reports carcinogens. 327,257 lbs released over 5 years.

    TRI facility ID 98203BNGCM3003W (U.S. EPA Toxics Release Inventory)

    Severity 8.7

  5. Cpp Casting Line, Everett

    TRI reporting facility.

    EPA FRS registry ID 110000489891 (U.S. EPA ECHO) Agency record

    Severity 8.4

  6. Fluid Motion Llc, Arlington

    Toxic chemical release facility (TRI). Chemicals: Styrene. Reports carcinogens. 111,966 lbs released over 5 years.

    TRI facility ID 9822WFLDMT17939 (U.S. EPA Toxics Release Inventory)

    Severity 8.4

  7. C&D Zodiac Inc, Marysville

    Toxic chemical release facility (TRI). Chemicals: Phenol, Methanol, Formaldehyde, Tetrabromobisphenol A. Reports carcinogens. 85,603 lbs released over 5 years.

    TRI facility ID 98270RCLLN12806 (U.S. EPA Toxics Release Inventory)

    Severity 8.3

  8. Romac Industries, Sultan

    TRI reporting facility.

    EPA FRS registry ID 110042260665 (U.S. EPA ECHO) Agency record

    Severity 8.1

  9. Fluid Motion Llc, Monroe

    Toxic chemical release facility (TRI). Chemicals: Styrene. Reports carcinogens. 32,948 lbs released over 5 years.

    TRI facility ID 98272GLCRB17341 (U.S. EPA Toxics Release Inventory)

    Severity 8

  10. Ranger Tugs Monroe R, Monroe

    Toxic chemical release facility (TRI). Chemicals: Styrene. Reports carcinogens. 31,458 lbs released over 5 years.

    TRI facility ID 98272LYMPCPOBOX (U.S. EPA Toxics Release Inventory)

    Severity 8

  11. Sr Smith Llc, Arlington

    Toxic chemical release facility (TRI). Chemicals: Styrene. Reports carcinogens. 26,772 lbs released over 5 years.

    TRI facility ID 98223CMPST24569 (U.S. EPA Toxics Release Inventory)

    Severity 7.9

  12. Abw Technologies, Arlington

    Toxic chemical release facility (TRI). Chemicals: Xylene (mixed isomers), n-Butyl alcohol, Ethylbenzene. Reports carcinogens. 19,048 lbs released over 5 years.

    TRI facility ID 9822WBWTCH67219 (U.S. EPA Toxics Release Inventory)

    Severity 7.8

  13. Achilles Usa Inc, Everett

    Toxic chemical release facility (TRI). Chemicals: Di(2-ethylhexyl) phthalate, Phenol, Antimony compounds, Lead compounds and 4 more. Reports carcinogens. 16,440 lbs released over 5 years.

    TRI facility ID 98203KHKKS14078 (U.S. EPA Toxics Release Inventory)

    Severity 7.7

  14. Cepheid - Bothell, Bothell

    Toxic chemical release facility (TRI). Chemicals: Acetonitrile, Dichloromethane, Toluene. Reports carcinogens. 9,299 lbs released over 5 years.

    TRI facility ID 9802WCPHDB16312 (U.S. EPA Toxics Release Inventory)

    Severity 7.5

  15. Lynnwood City Wastewater Treatment Plan, Edmonds

    Major air pollution source. Penalties $557,609.

    EPA FRS registry ID 110010409593 (U.S. EPA ECHO) Agency record

    Severity 7.5

  16. Boeing Everett, Everett

    Major air pollution source. Penalties $8,575.

    EPA FRS registry ID 110017406788 (U.S. EPA ECHO) Agency record

    Severity 7.5

  17. Romac Industries Bothell, Bothell

    TRI reporting facility.

    EPA FRS registry ID 110005388106 (U.S. EPA ECHO) Agency record

    Severity 7.3

  18. Granite Construction Co, Everett

    Toxic chemical release facility (TRI). Chemicals: Polycyclic aromatic compounds, Benzo[g,h,i]perylene. Reports carcinogens. 1,883 lbs released over 5 years.

    TRI facility ID 9820WGRNTC2111R (U.S. EPA Toxics Release Inventory)

    Severity 7

  19. Seacast Inc, Marysville

    TRI reporting facility.

    EPA FRS registry ID 110005343084 (U.S. EPA ECHO) Agency record

    Severity 7

  20. Lynnwood City Wastewater Treatment Plan, Edmonds

    NPDES wastewater discharge permit. Penalties $557,609.

    EPA FRS registry ID 110010409593 (U.S. EPA ECHO) Agency record

    Severity 7

  21. Boeing Everett, Everett

    Large hazardous waste generator. Penalties $8,575.

    EPA FRS registry ID 110017406788 (U.S. EPA ECHO) Agency record

    Severity 7

  22. Boeing Everett, Everett

    NPDES wastewater discharge permit. Penalties $8,575.

    EPA FRS registry ID 110017406788 (U.S. EPA ECHO) Agency record

    Severity 7

  23. Romac Industries, Sultan

    Toxic chemical release facility (TRI). Chemicals: Lead, Nickel, Diisocyanates, Manganese and 3 more. Reports carcinogens. 740 lbs released over 5 years.

    TRI facility ID 9829WRMCND125SS (U.S. EPA Toxics Release Inventory)

    Severity 6.7

  24. Edmonds Stp, Edmonds

    Major air pollution source. Penalties $750.

    EPA FRS registry ID 110000563220 (U.S. EPA ECHO) Agency record

    Severity 6.5

  25. Hampton Lumber Mill Darrington, Darrington

    Major air pollution source.

    EPA FRS registry ID 110006459616 (U.S. EPA ECHO) Agency record

    Severity 6.5

Correctional facilities

Prisons, jails and corrections operations with an EPA facility record, and the drinking water and wastewater compliance attached to them.

Discovery / public records

Records to request for Snohomish County

  • Washington state cancer registry

    Cancer incidence counts by census tract or ZIP code, by cancer type and year (de-identified). Any cancer cluster inquiries or investigations in Snohomish County, and their findings.

  • Washington vital statistics office

    Death certificate counts by cause of death and residence tract or ZIP code, and the years behind the mortality measures above.

  • Washington health department, environmental epidemiology

    Health consultations or assessments by ATSDR or the state health department covering the county, and any exposure investigations.

  • Washington environmental agency and the U.S. EPA regional office

    Compliance history, inspection reports, notices of violation, penalties and enforcement actions for each facility above, cited by EPA FRS registry ID.

  • Washington drinking water program

    Violation notices, sampling results and sanitary surveys for the public water systems serving the county, including any system serving a correctional facility.

  • Department of corrections or county sheriff

    Water testing, grievances and environmental health inspections for the correctional facilities listed above.

Each Envyrofax address report includes a printable records request worksheet with the custodian and the exact request wording per finding.

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