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Campbell County, Wyoming: environmental and disease records

Cancer mortality in Campbell County is 137.7 deaths per 100,000 people per year against a U.S. rate of 143.2. The strongest disease signals are Esophagus deaths at 1.9 times the U.S. rate. Federal databases place 516 regulated facilities, sites and hazards inside the county, led by NPDES wastewater discharge permit (154), Air permit holder (minor source) (80), Rail grade crossing (77). 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: 44.2471, -105.5504.

How this county ranks in Wyoming

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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 Campbell County compared with the United States
Cancer	Measure	County rate	U.S. rate	Times U.S.	95% interval	Years
Esophagus	Deaths	7.2	3.7	1.95xSignificant	3.9 to 12.2	2020-2024
Esophagus	New cases	7.5	4.6	1.63x	4.3 to 12.1	2019-2023
Thyroid	New cases	14.3	13	1.1x	9.7 to 20.3	2019-2023
Bladder	New cases	19.7	18.7	1.05x	13.9 to 27	2019-2023
Brain & nervous system	New cases	6.2	6.2	1x	3.5 to 10.3	2019-2023
All cancer	Deaths	137.7	143.2	0.96x	121.6 to 155.4	2020-2024
Kidney & renal pelvis	New cases	17.1	17.9	0.96x	12 to 23.6	2019-2023
Lung & bronchus	Deaths	28.3	30.2	0.94x	21.4 to 36.6	2020-2024
Pancreas	Deaths	10.2	11.3	0.9x	6.1 to 15.9	2020-2024
All cancer	New cases	402.6	453.4	0.89x	375.9 to 430.7	2019-2023
Leukemia	New cases	12.3	14.5	0.85x	8 to 18	2019-2023
Lung & bronchus	New cases	41.3	51.8	0.8x	33 to 51.1	2019-2023
Pancreas	New cases	10.7	13.9	0.77x	6.6 to 16.2	2019-2023
Non-Hodgkin lymphoma	New cases	12.8	18.5	0.69x	8.3 to 18.9	2019-2023
Melanoma of the skin	New cases	13	23.8	0.55x	8.6 to 18.8	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 Campbell County
Measure	County	U.S. median	Difference	Unit
Premature death	8,294.3	9,842.6	-16%	years of life lost before age 75 per 100,000
Life expectancy	76.5	75.3	+2%	years
Child mortality	56.9	59.8	-5%	deaths under age 18 per 100,000
Infant mortality	5.1	6.2	-19%	deaths under age 1 per 1,000 live births
Injury deaths	89.4	96.9	-8%	deaths per 100,000
Drug overdose deaths	15	28.6	-48%	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.

Formaldehyde10.1 per million
Carbon Tetrachloride2.6 per million
Acetaldehyde0.82 per million
Benzene0.72 per million

EPA Air Quality Index 2025

Monitored on 365 days: 271 good, 2 unhealthy for sensitive groups or worse. Median AQI 44, peak 156.

Regulated facilities, sites and hazards by type

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

NPDES wastewater discharge permit154
Air permit holder (minor source)80
Rail grade crossing77
EPA air quality monitor47
Gas station (mapped facility)36
Auto repair or body shop (mapped facility)31
Major air pollution source19
Hazardous waste transporter14
Small hazardous waste generator11
TRI reporting facility8
Toxic chemical release facility (TRI)8
Public airport6
Large greenhouse gas emitter6
Coal power plant6
Gas power plant3
Scrapyard (mapped facility)3
Landfill (mapped facility)2
Commercial airport1
Brownfield property1
Dry cleaner (mapped facility)1
Large hazardous waste generator1
Heliport1

Highest-severity records

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

Black Hills Corp - Neil Simpson Complex, Gillette
Toxic chemical release facility (TRI). Chemicals: Barium And Barium Compounds, Barium compounds (except for barium sulfate (CAS No. 7727-43-7)), Manganese, Copper and 4 more. Reports carcinogens. 8,505,421 lbs released over 5 years.
TRI facility ID 82716NLSMP13151 (U.S. EPA Toxics Release Inventory)
Severity 9.8
Basin Electric Dry Fork Station, Gillette
Toxic chemical release facility (TRI). Chemicals: Barium And Barium Compounds, Ammonia, Vanadium compounds, Manganese And Manganese Compounds and 4 more. Reports carcinogens. 6,009,033 lbs released over 5 years.
TRI facility ID 8271WBSNLC1246N (U.S. EPA Toxics Release Inventory)
Severity 9.7
Western Gas Resources Hilight Gas Plant, Gillette
Toxic chemical release facility (TRI). Chemicals: Formaldehyde, n-Hexane, Methanol, Benzene and 3 more. Reports carcinogens. 52,507 lbs released over 5 years.
TRI facility ID 8271WWSTRN1464H (U.S. EPA Toxics Release Inventory)
Severity 8.1
Pacificorp Wyodak Plant, Gillette
Toxic chemical release facility (TRI). Chemicals: Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size), Hydrogen fluoride, Zinc compounds, Barium And Barium Compounds and 4 more. Reports carcinogens. 45,358 lbs released over 5 years.
TRI facility ID 82718WYDKP48WYO (U.S. EPA Toxics Release Inventory)
Severity 8.1
50 Buttes, Gillette
Toxic chemical release facility (TRI). Chemicals: n-Hexane, Ethylene glycol, Toluene, Cyclohexane and 2 more. Reports carcinogens. 9,995 lbs released over 5 years.
TRI facility ID 8271WBTTSX3669S (U.S. EPA Toxics Release Inventory)
Severity 7.6
Black Hills Corp - Neil Simpson Complex, Gillette
TRI reporting facility.
EPA FRS registry ID 110000600341 (U.S. EPA ECHO) Agency record
Severity 6.9
Basin Electric Power Cooperative-Dry Fork Station, Gillette
TRI reporting facility.
EPA FRS registry ID 110039589585 (U.S. EPA ECHO) Agency record
Severity 6.8
Dry Fork Station, Gillette
Coal power plant.
Record ID 56609 (U.S. Energy Information Administration)
Severity 6.4
Wyodak, Gillette
Coal power plant.
Record ID 6101 (U.S. Energy Information Administration)
Severity 6.3
Neil Simpson Ii, Gillette
Coal power plant.
Record ID 7504 (U.S. Energy Information Administration)
Severity 6.1
Wygen Iii, Gillette
Coal power plant.
Record ID 56596 (U.S. Energy Information Administration)
Severity 6.1
Wygen 2, Gillette
Coal power plant.
Record ID 56319 (U.S. Energy Information Administration)
Severity 6.1
Wygen 1, Gillette
Coal power plant.
Record ID 55479 (U.S. Energy Information Administration)
Severity 6.1
Hilight Gas Plant, Gillette
TRI reporting facility.
EPA FRS registry ID 110000562702 (U.S. EPA ECHO) Agency record
Severity 5.9
Wyodak Plant, Gillette
TRI reporting facility.
EPA FRS registry ID 110007334982 (U.S. EPA ECHO) Agency record
Severity 5.8
Buckskin Mining Co Gillette Wy, Gillette
Toxic chemical release facility (TRI). Chemicals: Lead, Mercury. Reports carcinogens. 38 lbs released over 5 years.
TRI facility ID 82717TRTNC9543N (U.S. EPA Toxics Release Inventory)
Severity 5.7
50 Buttes, Gillette
TRI reporting facility.
EPA FRS registry ID 110063753656 (U.S. EPA ECHO) Agency record
Severity 5.7
Northeast Wyoming Rgnl, Gillette
Commercial airport. O.
Record ID GCC (FAA / U.S. DOT)
Severity 5
Nelson Brothers Mining Services Llc, Gillette
Toxic chemical release facility (TRI). Chemicals: Nitrate compounds (water dissociable; reportable only when in aqueous solution), Ammonia. 387 lbs released over 5 years.
TRI facility ID 82716NLSNB509T7 (U.S. EPA Toxics Release Inventory)
Severity 5
Nelson Brothers Mining Services Llc, Gillette
TRI reporting facility.
EPA FRS registry ID 110000600350 (U.S. EPA ECHO) Agency record
Severity 4.9
Caballo Mine, Gillette
NPDES wastewater discharge permit.
EPA FRS registry ID 110055164593 (U.S. EPA ECHO) Agency record
Severity 4.5
Keeline Pit-Basic Energy Services Facility, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110055182528 (U.S. EPA ECHO) Agency record
Severity 4.5
Urban Groves Pit/Pit Amendment (Lqd Sp0704), (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110055204256 (U.S. EPA ECHO) Agency record
Severity 4.5
State 36 Pit, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110055206717 (U.S. EPA ECHO) Agency record
Severity 4.5
State 36 Pit (Lqd Sp0820), (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110057201870 (U.S. EPA ECHO) Agency record
Severity 4.5

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 Campbell County

Wyoming 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 Campbell County, and their findings.
Wyoming vital statistics office
Death certificate counts by cause of death and residence tract or ZIP code, and the years behind the mortality measures above.
Wyoming health department, environmental epidemiology
Health consultations or assessments by ATSDR or the state health department covering the county, and any exposure investigations.
Wyoming 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.
Wyoming 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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