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Sweet Grass County, Montana: environmental and disease records

Cancer mortality in Sweet Grass County is 120.9 deaths per 100,000 people per year against a U.S. rate of 143.2. Federal databases place 66 regulated facilities, sites and hazards inside the county, led by Rail grade crossing (31), NPDES wastewater discharge permit (25), Gas station (mapped facility) (3). EPA AirToxScreen estimates a lifetime cancer risk from outdoor air toxics of 10 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: 45.6976, -109.8913.

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 Sweet Grass County compared with the United States
CancerMeasureCounty rateU.S. rateTimes U.S.95% intervalYears
All cancerNew cases409.2453.40.9x330.6 to 502.82019-2023
All cancerDeaths120.9143.20.84x83.6 to 172.62020-2024

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 Sweet Grass County
MeasureCountyU.S. medianDifferenceUnit
Premature death7,050.79,842.6-28%years of life lost before age 75 per 100,000
Life expectancy80.375.3+7%years
Child mortalityn/a59.8n/adeaths under age 18 per 100,000
Infant mortalityn/a6.2n/adeaths under age 1 per 1,000 live births
Injury deaths102.396.9+6%deaths per 100,000
Drug overdose deathsn/a28.6n/adeaths per 100,000

Air toxics and air quality

EPA AirToxScreen 2020

Lifetime cancer risk from outdoor air toxics: 10 in a million. EPA treats 100 in a million as the upper end of acceptable risk and 1 in a million as the goal.

  • Formaldehyde8.33 per million
  • Carbon Tetrachloride2.61 per million
  • Acetaldehyde0.79 per million
  • Pahpom0.63 per million

EPA Air Quality Index

No EPA air quality monitor reports daily AQI for this county.

Regulated facilities, sites and hazards by type

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

  • Rail grade crossing31
  • NPDES wastewater discharge permit25
  • Gas station (mapped facility)3
  • Brownfield property2
  • Public airport1
  • Solar power plant1
  • Wind power plant1
  • TRI reporting facility1
  • Toxic chemical release facility (TRI)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. Stillwater Mining Co East Boulder Mine, Big Timber

    Toxic chemical release facility (TRI). Chemicals: Nickel compounds, Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region), Methanol, Nickel And Nickel Compounds and 4 more. Reports carcinogens. 1,932,814 lbs released over 5 years.

    TRI facility ID 59011STLLWPOBOX (U.S. EPA Toxics Release Inventory)

    Severity 9.3

  2. Stillwater Mining Co East Boulder Mine, Big Timber

    TRI reporting facility.

    EPA FRS registry ID 110007110474 (U.S. EPA ECHO) Agency record

    Severity 6.6

  3. Stillwater Mining Co East Boulder Mine, Big Timber

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110072171931 (U.S. EPA ECHO) Agency record

    Severity 4.5

  4. Spring Creek Campground, Big Timber

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110052911122 (U.S. EPA ECHO) Agency record

    Severity 4

  5. Big Timber, Big Timber

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110009715157 (U.S. EPA ECHO) Agency record

    Severity 3.3

  6. Sweet Grass Cenex, Big Timber

    Brownfield property.

    EPA FRS registry ID 110037230546 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  7. Big Timber Old High School, Big Timber

    Brownfield property.

    EPA FRS registry ID 110071979007 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  8. Mdt Greycliff Rest Area, Greycliff

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110071781382 (U.S. EPA ECHO) Agency record

    Severity 2.5

  9. C Sharps Arms Co Inc, Big Timber

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110037422474 (U.S. EPA ECHO) Agency record

    Severity 2.3

  10. Big Timber At Howard Fld, Big Timber

    Public airport. O.

    Record ID 6S0 (FAA / U.S. DOT)

    Severity 2

  11. Yellowstone River Hatchery, Big Timber

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110011049436 (U.S. EPA ECHO) Agency record

    Severity 1.5

  12. Kingfisher Consulting Inc Big Timber Creek 318 Permit, Big Timber

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110030484250 (U.S. EPA ECHO) Agency record

    Severity 1.5

  13. Big Timber West End Sewer Main Extension, Big Timber

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110030485650 (U.S. EPA ECHO) Agency record

    Severity 1.5

  14. Edward T Copps Construction Mdt Sweetgrass Creek 318, Melville

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110039195144 (U.S. EPA ECHO) Agency record

    Severity 1.5

  15. William Heaney Little Timber Creek 318, Big Timber

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110040092495 (U.S. EPA ECHO) Agency record

    Severity 1.5

  16. Dnrc Carol Endicott Lower Deer Creek 318, Big Timber

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110042395146 (U.S. EPA ECHO) Agency record

    Severity 1.5

  17. Montana Rail Link Work Creek Rr Bridge 60 318, Reed Point

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110044270936 (U.S. EPA ECHO) Agency record

    Severity 1.5

  18. Montana Rail Link Hump Creek Rr Bridge 59 318, Reed Point

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110044270945 (U.S. EPA ECHO) Agency record

    Severity 1.5

  19. Fwp Lower Deer Creek 308, Big Timber

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110044270963 (U.S. EPA ECHO) Agency record

    Severity 1.5

  20. Conocophillips Yellowstone Pipe Line Co Sweetgrass Creek 318, Big Timber

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110044897369 (U.S. EPA ECHO) Agency record

    Severity 1.5

  21. Stillwater Excavating Boulder River Mdot Sweetgrass County 318, Big Timber

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110056149421 (U.S. EPA ECHO) Agency record

    Severity 1.5

  22. 44 Big Sky - Stablize Maintain Yellowstone Riverbank Erosion, Big Timber

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110056410236 (U.S. EPA ECHO) Agency record

    Severity 1.5

  23. Shiloh Sharps, Big Timber

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110057448622 (U.S. EPA ECHO) Agency record

    Severity 1.5

  24. Sweet Grass County Yellowstone River Riprap Removal 318, Greycliff

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110064609302 (U.S. EPA ECHO) Agency record

    Severity 1.5

  25. Sweet Grass County Yellowstone River Left Bank Erosion Mitigation, Greycliff

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110064609311 (U.S. EPA ECHO) Agency record

    Severity 1.5

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 Sweet Grass 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 Sweet Grass 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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