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Prairie County, Montana: environmental and disease records

Cancer mortality in Prairie County is 156 deaths per 100,000 people per year against a U.S. rate of 143.2. Federal databases place 59 regulated facilities, sites and hazards inside the county, led by Rail grade crossing (35), NPDES wastewater discharge permit (17), Brownfield property (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: 46.8611, -105.4454.

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 Prairie County compared with the United States
Cancer	Measure	County rate	U.S. rate	Times U.S.	95% interval	Years
All cancer	Deaths	156	143.2	1.09x	92 to 273.7	2020-2024
All cancer	New cases	389.5	453.4	0.86x	258.4 to 577	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 Prairie County
Measure	County	U.S. median	Difference	Unit
Premature death	4,336.6	9,842.6	-56%	years of life lost before age 75 per 100,000
Life expectancy	n/a	75.3	n/a	years
Child mortality	n/a	59.8	n/a	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	n/a	96.9	n/a	deaths per 100,000
Drug overdose deaths	n/a	28.6	n/a	deaths 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.

Formaldehyde8.93 per million
Carbon Tetrachloride2.81 per million
Acetaldehyde0.69 per million
Benzene0.53 per million

EPA Air Quality Index

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

Regulated facilities, sites and hazards by type

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

Rail grade crossing35
NPDES wastewater discharge permit17
Brownfield property3
Gas station (mapped facility)3
Public airport1

Highest-severity records

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

Town Of Terry Wwtf, Terry
NPDES wastewater discharge permit.
EPA FRS registry ID 110011049203 (U.S. EPA ECHO) Agency record
Severity 4.5
Gerald Schroeber, Fallon
NPDES wastewater discharge permit.
EPA FRS registry ID 110069997681 (U.S. EPA ECHO) Agency record
Severity 4.5
Homestead Cattle Co Llc, Terry
NPDES wastewater discharge permit.
EPA FRS registry ID 110064627845 (U.S. EPA ECHO) Agency record
Severity 4
Harding Land And Cattle Co Inc, Terry
NPDES wastewater discharge permit.
EPA FRS registry ID 110011385465 (U.S. EPA ECHO) Agency record
Severity 3.8
Evelyn Cameron Heritage, Inc., Terry
Brownfield property.
EPA FRS registry ID 110071968419 (U.S. EPA Brownfields (ACRES)) Agency record
Severity 3
Terry Hardware, Terry
Brownfield property.
EPA FRS registry ID 110071981594 (U.S. EPA Brownfields (ACRES)) Agency record
Severity 3
Gndc The Manor, Terry
Brownfield property.
EPA FRS registry ID 110071986715 (U.S. EPA Brownfields (ACRES)) Agency record
Severity 3
Diamond Ring Ranch, Terry
NPDES wastewater discharge permit.
EPA FRS registry ID 110012665259 (U.S. EPA ECHO) Agency record
Severity 2.3
Terry, Terry
Public airport. O.
Record ID 8U6 (FAA / U.S. DOT)
Severity 2
Fallon Wwtf, Fallon
NPDES wastewater discharge permit.
EPA FRS registry ID 110009860668 (U.S. EPA ECHO) Agency record
Severity 1.5
Martin Construction Mdot Prairie County 318, Terry
NPDES wastewater discharge permit.
EPA FRS registry ID 110041251819 (U.S. EPA ECHO) Agency record
Severity 1.5
Buffalo Rapids Irrigation Dist No 2 Yellowstone River Terry 318, Terry
NPDES wastewater discharge permit.
EPA FRS registry ID 110044897323 (U.S. EPA ECHO) Agency record
Severity 1.5
Cop Construction Cherry Creek 318 Permit, Terry
NPDES wastewater discharge permit.
EPA FRS registry ID 110064599260 (U.S. EPA ECHO) Agency record
Severity 1.5
Transcanada Keystone Pipeline Prairie County 318, Mildred
NPDES wastewater discharge permit.
EPA FRS registry ID 110064609561 (U.S. EPA ECHO) Agency record
Severity 1.5
Sletten Construction Cabin Creek 318, Mildred
NPDES wastewater discharge permit.
EPA FRS registry ID 110064630412 (U.S. EPA ECHO) Agency record
Severity 1.5
Tca Llc - Mdot Yellowstone River Bridge 1mi North Of Terry, Terry
NPDES wastewater discharge permit.
EPA FRS registry ID 110064640287 (U.S. EPA ECHO) Agency record
Severity 1.5
Sletten Construction Mcnaney Creek 318, Mildred
NPDES wastewater discharge permit.
EPA FRS registry ID 110064649144 (U.S. EPA ECHO) Agency record
Severity 1.5
Bad Route Interchange, Fallon
NPDES wastewater discharge permit.
EPA FRS registry ID 110071894750 (U.S. EPA ECHO) Agency record
Severity 1.5
Bad Route Borrow, Fallon
NPDES wastewater discharge permit.
EPA FRS registry ID 110072074055 (U.S. EPA ECHO) Agency record
Severity 1.5
Stickel Borrow Wb, Fallon
NPDES wastewater discharge permit.
EPA FRS registry ID 110072147770 (U.S. EPA ECHO) Agency record
Severity 1.5
Bad Route West Bound Support Site, Fallon
NPDES wastewater discharge permit.
EPA FRS registry ID 110072193039 (U.S. EPA ECHO) Agency record
Severity 1.5
Private, Mildred
Rail grade crossing.
Record ID 086207V (Federal Railroad Administration)
Severity 1.3
Private, Fallon
Rail grade crossing.
Record ID 092891W (Federal Railroad Administration)
Severity 1.3
Fallon E 15mi, Fallon
Rail grade crossing.
Record ID 092892D (Federal Railroad Administration)
Severity 1.3
S-340, Fallon
Rail grade crossing.
Record ID 092893K (Federal Railroad Administration)
Severity 1.3

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 Prairie 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 Prairie 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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