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Ravalli County, Montana: environmental and disease records

Cancer mortality in Ravalli County is 143.1 deaths per 100,000 people per year against a U.S. rate of 143.2. The strongest disease signals are Pancreas deaths at 1.3 times the U.S. rate. Federal databases place 323 regulated facilities, sites and hazards inside the county, led by NPDES wastewater discharge permit (118), Rail grade crossing (116), Auto repair or body shop (mapped facility) (24). EPA AirToxScreen estimates a lifetime cancer risk from outdoor air toxics of 20 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: 46.0596, -114.1333.

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 Ravalli County compared with the United States
Cancer	Measure	County rate	U.S. rate	Times U.S.	95% interval	Years
Bladder	Deaths	5.7	4.1	1.39x	3.5 to 9.1	2020-2024
Pancreas	Deaths	15.2	11.3	1.35xSignificant	11.5 to 20	2020-2024
Esophagus	New cases	5.6	4.6	1.22x	3.4 to 9.2	2019-2023
Esophagus	Deaths	4.4	3.7	1.19x	2.6 to 7.4	2020-2024
Pancreas	New cases	16.1	13.9	1.16x	12.3 to 21	2019-2023
Brain & nervous system	Deaths	4.6	4.4	1.05x	2.7 to 7.7	2020-2024
Bladder	New cases	19.2	18.7	1.03x	15 to 24.5	2019-2023
Leukemia	Deaths	5.8	5.7	1.02x	3.7 to 9	2020-2024
All cancer	Deaths	143.1	143.2	1x	131.3 to 155.8	2020-2024
Leukemia	New cases	14.1	14.5	0.97x	10.5 to 18.9	2019-2023
All cancer	New cases	430.2	453.4	0.95x	407.7 to 453.8	2019-2023
Liver & bile duct	Deaths	6.2	6.6	0.94x	3.9 to 9.7	2020-2024
Melanoma of the skin	New cases	22.1	23.8	0.93x	17 to 28.6	2019-2023
Thyroid	New cases	11.8	13	0.91x	7.8 to 17.3	2019-2023
Brain & nervous system	New cases	5.3	6.2	0.85x	3.1 to 8.8	2019-2023
Kidney & renal pelvis	New cases	15.2	17.9	0.85x	11.2 to 20.4	2019-2023
Lung & bronchus	New cases	43.9	51.8	0.85x	37.7 to 51	2019-2023
Non-Hodgkin lymphoma	New cases	15.5	18.5	0.84x	11.4 to 20.8	2019-2023
Lung & bronchus	Deaths	22.7	30.2	0.75x	18.5 to 28	2020-2024
Liver & bile duct	New cases	4.8	8.7	0.55x	3 to 7.8	2019-2023

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 Ravalli County
Measure	County	U.S. median	Difference	Unit
Premature death	6,194.5	9,842.6	-37%	years of life lost before age 75 per 100,000
Life expectancy	78.9	75.3	+5%	years
Child mortality	61.6	59.8	+3%	deaths under age 18 per 100,000
Infant mortality	n/a	6.2	n/a	deaths under age 1 per 1,000 live births
Injury deaths	115	96.9	+19%	deaths per 100,000
Drug overdose deaths	13	28.6	-54%	deaths per 100,000

Air toxics and air quality

EPA AirToxScreen 2020

Lifetime cancer risk from outdoor air toxics: 20 in a million. EPA treats 100 in a million as the upper end of acceptable risk and 1 in a million as the goal.

Formaldehyde10.87 per million
Carbon Tetrachloride2.62 per million
Acetaldehyde1.54 per million
Naphthalene1.26 per million

EPA Air Quality Index 2025

Monitored on 361 days: 286 good, 1 unhealthy for sensitive groups or worse. Median AQI 21, peak 123.

Regulated facilities, sites and hazards by type

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

NPDES wastewater discharge permit118
Rail grade crossing116
Auto repair or body shop (mapped facility)24
Gas station (mapped facility)20
Public airport11
Brownfield property9
Small hazardous waste generator5
Heliport5
Scrapyard (mapped facility)3
Major air pollution source2
EPA air quality monitor2
TRI reporting facility2
Toxic chemical release facility (TRI)2
Airfield1
Commercial airport1
Crematorium (mapped facility)1
Large hazardous waste generator1

Highest-severity records

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

Corixa Corp D/B/A Glaxosmithkline Vaccines - Hamilton, Hamilton
Toxic chemical release facility (TRI). Chemicals: Chloroform, Methanol, Acetonitrile. Reports carcinogens. 13,409 lbs released over 5 years.
TRI facility ID 59840RBMMN553OL (U.S. EPA Toxics Release Inventory)
Severity 7.7
Lubrizol, Victor
Toxic chemical release facility (TRI). Chemicals: Xylene (mixed isomers). 119,643 lbs released over 5 years.
TRI facility ID 59875SPCLT1131N (U.S. EPA Toxics Release Inventory)
Severity 6.9
Glaxosmithkline Biologicals - Hamilton, Hamilton
TRI reporting facility.
EPA FRS registry ID 110016686898 (U.S. EPA ECHO) Agency record
Severity 6.2
Ssp-Simatrix, Victor
TRI reporting facility.
EPA FRS registry ID 110013763702 (U.S. EPA ECHO) Agency record
Severity 5.9
Ravalli County Airport, Hamilton
NPDES wastewater discharge permit.
EPA FRS registry ID 110011048357 (U.S. EPA ECHO) Agency record
Severity 4.5
Montana Fabrication Works Inc, Stevensville
NPDES wastewater discharge permit.
EPA FRS registry ID 110011048990 (U.S. EPA ECHO) Agency record
Severity 4.5
Donaldson Brothers Ready Mix Inc, Hamilton
NPDES wastewater discharge permit.
EPA FRS registry ID 110011049061 (U.S. EPA ECHO) Agency record
Severity 4.5
Grantsdale Addition, Hamilton
NPDES wastewater discharge permit.
EPA FRS registry ID 110058917285 (U.S. EPA ECHO) Agency record
Severity 4.5
Yoder Gravel Pit, Stevensville
NPDES wastewater discharge permit.
EPA FRS registry ID 110070000828 (U.S. EPA ECHO) Agency record
Severity 4.5
Frontier Wood Preserving, Stevensville
Small hazardous waste generator.
EPA FRS registry ID 110070830340 (U.S. EPA ECHO) Agency record
Severity 4.3
Frontier Wood Preserving, Stevensville
NPDES wastewater discharge permit.
EPA FRS registry ID 110070830340 (U.S. EPA ECHO) Agency record
Severity 4.3
Town Of Darby Wwtf, Darby
NPDES wastewater discharge permit.
EPA FRS registry ID 110006723260 (U.S. EPA ECHO) Agency record
Severity 4
Wildflower Subdivision, Hamilton
NPDES wastewater discharge permit.
EPA FRS registry ID 110024578287 (U.S. EPA ECHO) Agency record
Severity 4
City Of Hamilton Wastewater Treatment Plant, Hamilton
NPDES wastewater discharge permit.
EPA FRS registry ID 110070894234 (U.S. EPA ECHO) Agency record
Severity 4
HAMILTON - PS 46, Hamilton
EPA air quality monitor.
Record ID 300810007 (U.S. EPA AirData)
Severity 3.9
Rocky Mountain Laboratories Facility, Hamilton
Major air pollution source.
EPA FRS registry ID 110001474770 (U.S. EPA ECHO) Agency record
Severity 3.8
Truck Parts Unlimited, Victor
NPDES wastewater discharge permit.
EPA FRS registry ID 110006067969 (U.S. EPA ECHO) Agency record
Severity 3.8
Ssp-Simatrix, Victor
Major air pollution source.
EPA FRS registry ID 110013763702 (U.S. EPA ECHO) Agency record
Severity 3.5
Glaxosmithkline Biologicals - Hamilton, Hamilton
Large hazardous waste generator.
EPA FRS registry ID 110016686898 (U.S. EPA ECHO) Agency record
Severity 3.5
Falcon Estates Subdivision, Florence
NPDES wastewater discharge permit.
EPA FRS registry ID 110023137327 (U.S. EPA ECHO) Agency record
Severity 3.5
One Horse Estates, Florence
NPDES wastewater discharge permit.
EPA FRS registry ID 110064621100 (U.S. EPA ECHO) Agency record
Severity 3.5
Rocky Mountain Laboratories Facility, Hamilton
NPDES wastewater discharge permit.
EPA FRS registry ID 110001474770 (U.S. EPA ECHO) Agency record
Severity 3.3
Hamilton School District 3, Hamilton
Brownfield property.
EPA FRS registry ID 110015748226 (U.S. EPA Brownfields (ACRES)) Agency record
Severity 3
Hamilton Middle School, Hamilton
Brownfield property.
EPA FRS registry ID 110036932825 (U.S. EPA Brownfields (ACRES)) Agency record
Severity 3
Washington Elementary School, Hamilton
Brownfield property.
EPA FRS registry ID 110043212831 (U.S. EPA Brownfields (ACRES)) Agency record
Severity 3

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 Ravalli 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 Ravalli 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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