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Park County, Wyoming: environmental and disease records

Cancer mortality in Park County is 132 deaths per 100,000 people per year against a U.S. rate of 143.2. Federal databases place 249 regulated facilities, sites and hazards inside the county, led by NPDES wastewater discharge permit (90), Rail grade crossing (62), Gas station (mapped facility) (22). 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: 44.4026, -109.4142.

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 Park County compared with the United States
Cancer	Measure	County rate	U.S. rate	Times U.S.	95% interval	Years
Esophagus	Deaths	5.9	3.7	1.59x	3.3 to 10.2	2020-2024
Thyroid	New cases	18.4	13	1.42x	12 to 27	2019-2023
Non-Hodgkin lymphoma	Deaths	6.3	4.8	1.31x	3.5 to 10.9	2020-2024
Melanoma of the skin	New cases	30.9	23.8	1.3x	23.4 to 40.3	2019-2023
Leukemia	Deaths	7.1	5.7	1.25x	4.2 to 11.8	2020-2024
Bladder	New cases	19.1	18.7	1.02x	14.1 to 25.8	2019-2023
Pancreas	Deaths	11.2	11.3	0.99x	7.4 to 16.7	2020-2024
All cancer	New cases	424.9	453.4	0.94x	396.6 to 454.8	2019-2023
All cancer	Deaths	132	143.2	0.92x	117.6 to 147.9	2020-2024
Pancreas	New cases	11.6	13.9	0.83x	7.6 to 17.2	2019-2023
Leukemia	New cases	12	14.5	0.83x	7.7 to 18.1	2019-2023
Non-Hodgkin lymphoma	New cases	14.7	18.5	0.79x	9.5 to 21.9	2019-2023
Kidney & renal pelvis	New cases	12.6	17.9	0.7x	8.3 to 18.7	2019-2023
Lung & bronchus	Deaths	21.2	30.2	0.7x	15.9 to 28.2	2020-2024
Lung & bronchus	New cases	35	51.8	0.68x	28.1 to 43.5	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 Park County
Measure	County	U.S. median	Difference	Unit
Premature death	7,530.1	9,842.6	-23%	years of life lost before age 75 per 100,000
Life expectancy	78.1	75.3	+4%	years
Child mortality	48.1	59.8	-20%	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	90.9	96.9	-6%	deaths per 100,000
Drug overdose deaths	16.7	28.6	-42%	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.

Formaldehyde7.95 per million
Carbon Tetrachloride2.55 per million
Acetaldehyde0.74 per million
Pahpom0.63 per million

EPA Air Quality Index 2025

Monitored on 355 days: 348 good, 0 unhealthy for sensitive groups or worse. Median AQI 13, peak 73.

Regulated facilities, sites and hazards by type

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

NPDES wastewater discharge permit90
Rail grade crossing62
Gas station (mapped facility)22
Air permit holder (minor source)17
Hazardous waste transporter9
Auto repair or body shop (mapped facility)8
Major air pollution source6
Small hazardous waste generator5
Hydroelectric plant5
Public airport4
Industrial wastewater discharge4
Large hazardous waste generator3
EPA air quality monitor2
Commercial airport2
Heliport2
TRI reporting facility2
Toxic chemical release facility (TRI)2
Large greenhouse gas emitter1
Landfill (mapped facility)1
Other power plant1
Wastewater plant (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.

Yellowstone Rgnl, Cody
Commercial airport. O.
Record ID COD (FAA / U.S. DOT)
Severity 5
Elk Basin Gas Plant, Powell
Major air pollution source. Penalties $4,000.
EPA FRS registry ID 110001933551 (U.S. EPA ECHO) Agency record
Severity 4.8
Elk Basin Water Flood Station 8, (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110055169393 (U.S. EPA ECHO) Agency record
Severity 4.5
North Danker Battery (Previously N. Danker 9-4 Battery), (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110055172575 (U.S. EPA ECHO) Agency record
Severity 4.5
Elk Basin Gas Plant, (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110055176376 (U.S. EPA ECHO) Agency record
Severity 4.5
Big Horn Co-Op Service And Fertilizer Plant, Powell
NPDES wastewater discharge permit.
EPA FRS registry ID 110055183796 (U.S. EPA ECHO) Agency record
Severity 4.5
Cody Lumber Pit (Lqd Pt0818), (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110055204041 (U.S. EPA ECHO) Agency record
Severity 4.5
Y-Tex Corp, Cody
Toxic chemical release facility (TRI). Chemicals: Diazinon, Piperonyl butoxide, Mixture. Reports carcinogens.
TRI facility ID 82414YTXCR1825B (U.S. EPA Toxics Release Inventory)
Severity 4.5
Polecat Facility, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110055167723 (U.S. EPA ECHO) Agency record
Severity 4.3
Atwood Lease, (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110055172389 (U.S. EPA ECHO) Agency record
Severity 4.3
Y Tex Corp, Cody
TRI reporting facility.
EPA FRS registry ID 110011685140 (U.S. EPA ECHO) Agency record
Severity 4
Wayne Div Dakota Coal Frannie Lime Plant, Frannie
TRI reporting facility.
EPA FRS registry ID 110040969734 (U.S. EPA ECHO) Agency record
Severity 4
Hunt Field Airport, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110055194622 (U.S. EPA ECHO) Agency record
Severity 4
Rawhide Oil Field, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110055203060 (U.S. EPA ECHO) Agency record
Severity 3.8
Elk Basin Compressor Station (Colorado Interstate Gas), Powell
Major air pollution source.
EPA FRS registry ID 110002321531 (U.S. EPA ECHO) Agency record
Severity 3.5
Williston Basin Ipc_Lovell Compr Station, Powell
Major air pollution source.
EPA FRS registry ID 110010412730 (U.S. EPA ECHO) Agency record
Severity 3.5
Merit Energy-Halfmoon Station, Unk
Major air pollution source.
EPA FRS registry ID 110010413007 (U.S. EPA ECHO) Agency record
Severity 3.5
Sheldon Dome Field, Cody
NPDES wastewater discharge permit.
EPA FRS registry ID 110013314485 (U.S. EPA ECHO) Agency record
Severity 3.5
Oregon Basin Gas Plant, Cody
Major air pollution source.
EPA FRS registry ID 110022470707 (U.S. EPA ECHO) Agency record
Severity 3.5
Powell, City Of, Powell
NPDES wastewater discharge permit.
EPA FRS registry ID 110055197424 (U.S. EPA ECHO) Agency record
Severity 3.5
Oregon Basin Field Generation, Park County
Major air pollution source.
EPA FRS registry ID 110071037869 (U.S. EPA ECHO) Agency record
Severity 3.5
Former Yellowstone-Cody Refinery (The Refinery), (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110055243366 (U.S. EPA ECHO) Agency record
Severity 3.3
Wyoming Lime Producers, Frannie
Toxic chemical release facility (TRI). Chemicals: Lead compounds, Lead And Lead Compounds.
TRI facility ID 82423WYMNG30HWY (U.S. EPA Toxics Release Inventory)
Severity 3.1
Northwest College, Powell
Large hazardous waste generator.
EPA FRS registry ID 110070643386 (U.S. EPA ECHO) Agency record
Severity 3
Cascade Campground (2 Mi North Of Fishing Bridge) Yellowstone National Park, Yellowstone National Park
Large hazardous waste generator.
EPA FRS registry ID 110070863490 (U.S. EPA ECHO) 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 Park 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 Park 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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