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Missoula County, Montana: environmental and disease records

Cancer mortality in Missoula County is 129.9 deaths per 100,000 people per year against a U.S. rate of 143.2. Federal databases place 605 regulated facilities, sites and hazards inside the county, led by NPDES wastewater discharge permit (262), Rail grade crossing (106), Brownfield property (65). 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: 47.1136, -113.9448.

How this county ranks in Montana

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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 Missoula County compared with the United States
CancerMeasureCounty rateU.S. rateTimes U.S.95% intervalYears
Brain & nervous systemNew cases8.86.21.42xSignificant6.6 to 11.52019-2023
Brain & nervous systemDeaths54.41.14x3.5 to 6.92020-2024
LeukemiaDeaths6.45.71.12x4.6 to 8.72020-2024
EsophagusNew cases5.14.61.11x3.5 to 7.22019-2023
Melanoma of the skinDeaths2.221.1x1.3 to 3.72020-2024
BladderNew cases20.218.71.08x16.9 to 23.92019-2023
BladderDeaths4.34.11.05x2.9 to 6.22020-2024
LeukemiaNew cases14.414.50.99x11.6 to 17.72019-2023
All cancerNew cases442.6453.40.98x426.7 to 4592019-2023
Non-Hodgkin lymphomaNew cases17.718.50.96x14.6 to 21.22019-2023
PancreasNew cases1313.90.94x10.4 to 16.12019-2023
ThyroidNew cases12.1130.93x9.4 to 15.32019-2023
EsophagusDeaths3.43.70.92x2.2 to 5.22020-2024
All cancerDeaths129.9143.20.91x121.4 to 138.82020-2024
Melanoma of the skinNew cases20.323.80.85x16.9 to 24.12019-2023
Liver & bile ductNew cases7.28.70.83x5.3 to 9.52019-2023
Liver & bile ductDeaths5.46.60.82x3.9 to 7.52020-2024
PancreasDeaths9.211.30.81x7.1 to 11.82020-2024
Lung & bronchusDeaths24.530.20.81x20.9 to 28.52020-2024
Lung & bronchusNew cases40.451.80.78x35.9 to 45.52019-2023
Kidney & renal pelvisNew cases13.117.90.73x10.5 to 16.22019-2023
Non-Hodgkin lymphomaDeaths3.44.80.71x2.2 to 5.22020-2024
Kidney & renal pelvisDeaths2.43.40.71x1.4 to 42020-2024
StomachNew cases4.56.60.68x3 to 6.52019-2023

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 Missoula County
MeasureCountyU.S. medianDifferenceUnit
Premature death6,796.29,842.6-31%years of life lost before age 75 per 100,000
Life expectancy78.675.3+4%years
Child mortality44.859.8-25%deaths under age 18 per 100,000
Infant mortality4.56.2-27%deaths under age 1 per 1,000 live births
Injury deaths83.496.9-14%deaths per 100,000
Drug overdose deaths16.828.6-41%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.

  • Formaldehyde14.6 per million
  • Naphthalene2.82 per million
  • Carbon Tetrachloride2.65 per million
  • Acetaldehyde2.23 per million

EPA Air Quality Index 2025

Monitored on 365 days: 298 good, 0 unhealthy for sensitive groups or worse. Median AQI 38, peak 98.

Regulated facilities, sites and hazards by type

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

  • NPDES wastewater discharge permit262
  • Rail grade crossing106
  • Brownfield property65
  • Gas station (mapped facility)61
  • Auto repair or body shop (mapped facility)34
  • Air permit holder (minor source)16
  • Small hazardous waste generator13
  • Scrapyard (mapped facility)8
  • Public airport5
  • Hazardous waste transporter5
  • Major air pollution source4
  • Heliport4
  • TRI reporting facility4
  • Toxic chemical release facility (TRI)4
  • EPA air quality monitor3
  • Dry cleaner (mapped facility)2
  • Large hazardous waste generator2
  • Airfield1
  • Commercial airport1
  • Large greenhouse gas emitter1
  • Landfill (mapped facility)1
  • Superfund (NPL) site1
  • Proposed Superfund site1
  • Wastewater plant (mapped facility)1

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. Milltown Reservoir Sediments, Milltown

    Superfund (NPL) site. Hazard Ranking System score 43.8. NPL Site.

    EPA site ID MTD980717565 (U.S. EPA Superfund (SEMS/NPL)) Agency record

    Severity 10

  2. Roseburg Forest Products Co. - Missoula Particleboard, Missoula

    Toxic chemical release facility (TRI). Chemicals: Formaldehyde, Methanol, Acetaldehyde, Lead. Reports carcinogens. 389,118 lbs released over 5 years.

    TRI facility ID 59802LSNPC3300R (U.S. EPA Toxics Release Inventory)

    Severity 8.8

  3. Hexion Inc., Missoula

    Toxic chemical release facility (TRI). Chemicals: Formaldehyde, Methanol, Phenol, Formic acid. Reports carcinogens. 87,564 lbs released over 5 years.

    TRI facility ID 59802BRDNN3670G (U.S. EPA Toxics Release Inventory)

    Severity 8.3

  4. Smurfit-Stone Mill, Missoula

    Proposed Superfund site. Hazard Ranking System score 50. Proposed NPL Site.

    EPA site ID MTN000802850 (U.S. EPA Superfund (SEMS/NPL)) Agency record

    Severity 8

  5. Phillips 66 Missoula Products Terminal, Missoula

    Toxic chemical release facility (TRI). Chemicals: n-Hexane, Toluene, Benzene, Xylene (mixed isomers) and 4 more. Reports carcinogens. 19,085 lbs released over 5 years.

    TRI facility ID 59808CNCMS3330R (U.S. EPA Toxics Release Inventory)

    Severity 7.8

  6. Jtl Group Missoula (Dba Knife River-Missoula), Missoula

    Toxic chemical release facility (TRI). Chemicals: Nitrate compounds (water dissociable; reportable only when in aqueous solution), Polycyclic aromatic compounds, Lead And Lead Compounds, Benzo[g,h,i]perylene. Reports carcinogens. 575 lbs released over 5 years.

    TRI facility ID 59808JTLGR48WIL (U.S. EPA Toxics Release Inventory)

    Severity 6.6

  7. Roseburg Forest Products, Missoula

    TRI reporting facility.

    EPA FRS registry ID 110000428582 (U.S. EPA ECHO) Agency record

    Severity 6.1

  8. Hexion Inc. - Missoula, Missoula

    TRI reporting facility.

    EPA FRS registry ID 110000428573 (U.S. EPA ECHO) Agency record

    Severity 5.9

  9. Phillips 66 - Missoula Terminal, Missoula

    TRI reporting facility.

    EPA FRS registry ID 110020291922 (U.S. EPA ECHO) Agency record

    Severity 5.7

  10. Missoula Montana, Missoula

    Commercial airport. O.

    Record ID MSO (FAA / U.S. DOT)

    Severity 5

  11. Jtl Group-Wilkie Street, Missoula

    TRI reporting facility.

    EPA FRS registry ID 110015785319 (U.S. EPA ECHO) Agency record

    Severity 4.8

  12. French Town - Beckwith, Frenchtown

    EPA air quality monitor.

    Record ID 300630037 (U.S. EPA AirData)

    Severity 4.5

  13. Billingsley Placer Mine, Lolo

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110010826035 (U.S. EPA ECHO) Agency record

    Severity 4.5

  14. Woody Mountain Court, Missoula

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110013342365 (U.S. EPA ECHO) Agency record

    Severity 4.5

  15. United Parcel Service-Missoula, Missoula

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110017358517 (U.S. EPA ECHO) Agency record

    Severity 4.5

  16. Bfs Group Llc €“ Missoula Mt Truss/Mw/Panel, Missoula

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110030484857 (U.S. EPA ECHO) Agency record

    Severity 4.5

  17. L S Jensen Construction And Ready Mix Missoula International Airport, Missoula

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110032593441 (U.S. EPA ECHO) Agency record

    Severity 4.5

  18. City Of Missoula Wwtp, Missoula

    NPDES wastewater discharge permit. Penalties $1,400.

    EPA FRS registry ID 110064243661 (U.S. EPA ECHO) Agency record

    Severity 4.5

  19. Peak Health & Wellness Center Sewer System, Missoula

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110064608839 (U.S. EPA ECHO) Agency record

    Severity 4.5

  20. Missoula County, Missoula

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110064648118 (U.S. EPA ECHO) Agency record

    Severity 4.5

  21. Mill Creek Meadows Subdivision, Frenchtown

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110070134564 (U.S. EPA ECHO) Agency record

    Severity 4.5

  22. Clark Fork Site, Missoula

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110070925668 (U.S. EPA ECHO) Agency record

    Severity 4.5

  23. University Of Montana - Missoula Ms4, Missoula

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110020332353 (U.S. EPA ECHO) Agency record

    Severity 4.3

  24. Missoula County Public Schools Vo-Ag Center, Missoula County

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110069561192 (U.S. EPA ECHO) Agency record

    Severity 4.3

  25. Roseburg Forest Products, Missoula

    Major air pollution source.

    EPA FRS registry ID 110000428582 (U.S. EPA ECHO) Agency record

    Severity 3.8

Correctional facilities

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

No correctional facility with an EPA record is located in this county.

Discovery / public records

Records to request for Missoula County

  • Montana 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 Missoula County, and their findings.

  • Montana vital statistics office

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

  • Montana health department, environmental epidemiology

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

  • Montana 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.

  • Montana 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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