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Carter County, Montana: environmental and disease records

Cancer mortality in Carter County is 185.6 deaths per 100,000 people per year against a U.S. rate of 143.2. Federal databases place 34 regulated facilities, sites and hazards inside the county, led by NPDES wastewater discharge permit (22), Brownfield property (5), Public airport (4). 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: 45.6318, -104.5118.

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 Carter County compared with the United States
Cancer	Measure	County rate	U.S. rate	Times U.S.	95% interval	Years
All cancer	Deaths	185.6	143.2	1.3x	112.2 to 299.9	2020-2024
All cancer	New cases	427.6	453.4	0.94x	293.5 to 606.2	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 Carter County
Measure	County	U.S. median	Difference	Unit
Premature death	8,629.1	9,842.6	-12%	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	153	96.9	+58%	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.

Formaldehyde9.32 per million
Carbon Tetrachloride2.72 per million
Acetaldehyde0.72 per million
Benzene0.56 per million

EPA Air Quality Index

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

Regulated facilities, sites and hazards by type

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

NPDES wastewater discharge permit22
Brownfield property5
Public airport4
Gas station (mapped facility)2
Landfill (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.

Ekalaka Wwtf, Ekalaka
NPDES wastewater discharge permit. Penalties $1,800.
EPA FRS registry ID 110009860506 (U.S. EPA ECHO) Agency record
Severity 4.5
Greg Williams Ranch Inc, Ekalaka
NPDES wastewater discharge permit.
EPA FRS registry ID 110023137210 (U.S. EPA ECHO) Agency record
Severity 4
Ekalaka Luedtke Property, Ekalaka
Brownfield property.
EPA FRS registry ID 110043425530 (U.S. EPA Brownfields (ACRES)) Agency record
Severity 3
Ekalaka Elementry School, Ekalaka
Brownfield property.
EPA FRS registry ID 110071971003 (U.S. EPA Brownfields (ACRES)) Agency record
Severity 3
Ekalaka Triangle Property, Ekalaka
Brownfield property.
EPA FRS registry ID 110071971004 (U.S. EPA Brownfields (ACRES)) Agency record
Severity 3
Carter County Hospital, Ekalaka
Brownfield property.
EPA FRS registry ID 110071981586 (U.S. EPA Brownfields (ACRES)) Agency record
Severity 3
Old Main Street Market, Ekalaka
Brownfield property.
EPA FRS registry ID 110072080385 (U.S. EPA Brownfields (ACRES)) Agency record
Severity 3
Mlv-161, Mill Iron
NPDES wastewater discharge permit.
EPA FRS registry ID 110071953571 (U.S. EPA ECHO) Agency record
Severity 2.5
Ekalaka, Ekalaka
Public airport. O.
Record ID 97M (FAA / U.S. DOT)
Severity 2
Landfill
Landfill (mapped facility). Mapped facility presence only; no compliance or exposure measurements.
Record ID way/847781721 (OpenStreetMap contributors) Agency record
Severity 2
Ekalaka Ii Pump Station, Ekalaka
NPDES wastewater discharge permit.
EPA FRS registry ID 110071670808 (U.S. EPA ECHO) Agency record
Severity 1.8
American Colloid Co - Alzada Mine, Alzada
NPDES wastewater discharge permit.
EPA FRS registry ID 110010825991 (U.S. EPA ECHO) Agency record
Severity 1.5
Bentonite Performance Minerals, Alzada
NPDES wastewater discharge permit.
EPA FRS registry ID 110011047866 (U.S. EPA ECHO) Agency record
Severity 1.5
Carter County - Whitetail Bridge, Hammond
NPDES wastewater discharge permit.
EPA FRS registry ID 110039183219 (U.S. EPA ECHO) Agency record
Severity 1.5
Carter County - Boxelder Creek Bridge Replacement Br 9006, Hammond
NPDES wastewater discharge permit.
EPA FRS registry ID 110040082781 (U.S. EPA ECHO) Agency record
Severity 1.5
Carter County - Whitetail Creek Bridge Replacement Br 277-1, Hammond
NPDES wastewater discharge permit.
EPA FRS registry ID 110040082790 (U.S. EPA ECHO) Agency record
Severity 1.5
Franz Construction - Heggen Creek 318, Ekalaka
NPDES wastewater discharge permit.
EPA FRS registry ID 110040091548 (U.S. EPA ECHO) Agency record
Severity 1.5
Franz Construction - Little Beaver Creek 318, Ekalaka
NPDES wastewater discharge permit.
EPA FRS registry ID 110040091557 (U.S. EPA ECHO) Agency record
Severity 1.5
Armstrong Operating - Hat Creek Federal 2, Ekalaka
NPDES wastewater discharge permit.
EPA FRS registry ID 110043481611 (U.S. EPA ECHO) Agency record
Severity 1.5
Ed Baxter Construction - Pilster Reservoir, Alzada
NPDES wastewater discharge permit.
EPA FRS registry ID 110044245885 (U.S. EPA ECHO) Agency record
Severity 1.5
Oneok Carter County Bakken Pipeline 318, Ekalaka
NPDES wastewater discharge permit.
EPA FRS registry ID 110045495656 (U.S. EPA ECHO) Agency record
Severity 1.5
Belle Fourche Pipeline Carter County 318, Ekalaka
NPDES wastewater discharge permit.
EPA FRS registry ID 110046332241 (U.S. EPA ECHO) Agency record
Severity 1.5
Bison Pipeline Llc Carter County Pipeline 318, Hammond
NPDES wastewater discharge permit.
EPA FRS registry ID 110064623117 (U.S. EPA ECHO) Agency record
Severity 1.5
Bison Pipeline Llc Carter County Pipeline 318, Hammond
NPDES wastewater discharge permit.
EPA FRS registry ID 110064632036 (U.S. EPA ECHO) Agency record
Severity 1.5
Hammond 1, Alzada
NPDES wastewater discharge permit.
EPA FRS registry ID 110071069345 (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 Carter 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 Carter 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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