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Fremont County, Wyoming: environmental and disease records

Cancer mortality in Fremont County is 164.7 deaths per 100,000 people per year against a U.S. rate of 143.2, a statistically significant excess. Federal databases place 285 regulated facilities, sites and hazards inside the county, led by NPDES wastewater discharge permit (176), Gas station (mapped facility) (20), Rail grade crossing (19). 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: 43.1347, -108.5705.

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 Fremont County compared with the United States
Cancer	Measure	County rate	U.S. rate	Times U.S.	95% interval	Years
Bladder	Deaths	6.5	4.1	1.59x	3.8 to 10.6	2020-2024
Brain & nervous system	Deaths	6.6	4.4	1.5x	3.9 to 10.8	2020-2024
All cancer	Deaths	164.7	143.2	1.15xSignificant	149.2 to 181.5	2020-2024
Lung & bronchus	Deaths	30.5	30.2	1.01x	24.3 to 38.1	2020-2024
Melanoma of the skin	New cases	23.3	23.8	0.98x	17.4 to 30.5	2019-2023
Kidney & renal pelvis	New cases	16.3	17.9	0.91x	11.6 to 22.4	2019-2023
Pancreas	Deaths	10.1	11.3	0.89x	6.8 to 14.7	2020-2024
Leukemia	New cases	12.9	14.5	0.89x	8.6 to 18.7	2019-2023
Bladder	New cases	16	18.7	0.86x	11.5 to 21.8	2019-2023
All cancer	New cases	384.9	453.4	0.85x	360.5 to 410.7	2019-2023
Non-Hodgkin lymphoma	New cases	14.4	18.5	0.78x	9.8 to 20.4	2019-2023
Lung & bronchus	New cases	38.2	51.8	0.74x	31.3 to 46.4	2019-2023
Pancreas	New cases	10.1	13.9	0.73x	6.7 to 14.8	2019-2023
Thyroid	New cases	8.7	13	0.67x	4.9 to 14.3	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 Fremont County
Measure	County	U.S. median	Difference	Unit
Premature death	16,822.7	9,842.6	+71%	years of life lost before age 75 per 100,000
Life expectancy	70.5	75.3	-6%	years
Child mortality	87.6	59.8	+47%	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	157.4	96.9	+62%	deaths per 100,000
Drug overdose deaths	33.9	28.6	+18%	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.

Formaldehyde8.58 per million
Carbon Tetrachloride2.52 per million
Acetaldehyde0.76 per million
Naphthalene0.55 per million

EPA Air Quality Index 2025

Monitored on 365 days: 254 good, 0 unhealthy for sensitive groups or worse. Median AQI 47, peak 100.

Regulated facilities, sites and hazards by type

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

NPDES wastewater discharge permit176
Gas station (mapped facility)20
Rail grade crossing19
Air permit holder (minor source)13
Brownfield property13
Small hazardous waste generator8
Major air pollution source6
EPA air quality monitor6
Commercial airport3
Hazardous waste transporter3
Public airport2
Large greenhouse gas emitter2
Large hazardous waste generator2
Heliport2
Hydroelectric plant2
Gas power plant2
Scrapyard (mapped facility)2
Landfill (mapped facility)1
TRI reporting facility1
Toxic chemical release facility (TRI)1
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.

Lost Cabin Gas Plant, Lysite
Major air pollution source. Penalties $15,000.
EPA FRS registry ID 110000569803 (U.S. EPA ECHO) Agency record
Severity 6.8
Chemtrade Refinery Services Inc - Riverton Plant, Riverton
TRI reporting facility. Penalties $10,250.
EPA FRS registry ID 110000468146 (U.S. EPA ECHO) Agency record
Severity 6.5
Lost Cabin Gas Plant, Lysite
NPDES wastewater discharge permit. Penalties $15,000.
EPA FRS registry ID 110000569803 (U.S. EPA ECHO) Agency record
Severity 6.3
Chemtrade Refinery Services Inc, Riverton
Toxic chemical release facility (TRI). Chemicals: Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size). 8,762 lbs released over 5 years.
TRI facility ID 82501RVRTN140GO (U.S. EPA Toxics Release Inventory)
Severity 6
Lost Cabin Gas Plant, Lysite
Large greenhouse gas emitter. Penalties $15,000.
EPA FRS registry ID 110000569803 (U.S. EPA ECHO) Agency record
Severity 5.8
Lander Wastewater Lagoon, Lander
NPDES wastewater discharge permit.
EPA FRS registry ID 110064598412 (U.S. EPA ECHO) Agency record
Severity 5.5
Riverton Wwtf, Riverton
NPDES wastewater discharge permit. Penalties $1,400.
EPA FRS registry ID 110055197451 (U.S. EPA ECHO) Agency record
Severity 5
Central Wyoming Rgnl, Riverton
Commercial airport. O.
Record ID RIW (FAA / U.S. DOT)
Severity 5
Big Eagle Mine, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110055190458 (U.S. EPA ECHO) Agency record
Severity 4.8
Pinedale Anticline & Jonah Infill Oil & Gas Project Area, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110055165137 (U.S. EPA ECHO) Agency record
Severity 4.5
Wild Bill & Titus State, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110055182859 (U.S. EPA ECHO) Agency record
Severity 4.5
Schlosser Shale Pit, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110070228026 (U.S. EPA ECHO) Agency record
Severity 4.5
Big Horn Co-Op Riverton Facility, Riverton
NPDES wastewater discharge permit.
EPA FRS registry ID 110071710891 (U.S. EPA ECHO) Agency record
Severity 4.5
Ethete Water Treatment Plant, Ethete
NPDES wastewater discharge permit.
EPA FRS registry ID 110010138751 (U.S. EPA ECHO) Agency record
Severity 4.3
Frenchie Draw Permit #1, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110055199663 (U.S. EPA ECHO) Agency record
Severity 4.3
Chemtrade Refinery Services Inc - Riverton Plant, Riverton
Large hazardous waste generator. Penalties $10,250.
EPA FRS registry ID 110000468146 (U.S. EPA ECHO) Agency record
Severity 4
Riverton, City Of, Riverton
NPDES wastewater discharge permit.
EPA FRS registry ID 110006684481 (U.S. EPA ECHO) Agency record
Severity 4
Saint Stephens Indian School, Saint Stephens
NPDES wastewater discharge permit.
EPA FRS registry ID 110022836626 (U.S. EPA ECHO) Agency record
Severity 4
Big Bend Gravel Pit (Discharge Wastewater, Industrial Ops), Riverton
NPDES wastewater discharge permit.
EPA FRS registry ID 110069222558 (U.S. EPA ECHO) Agency record
Severity 4
Chief Washakie Recreation Comp, Fort Washakie
NPDES wastewater discharge permit.
EPA FRS registry ID 110010854860 (U.S. EPA ECHO) Agency record
Severity 3.8
Triangle Unit Central - Beaver Creek 2, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110055170791 (U.S. EPA ECHO) Agency record
Severity 3.8
East Cottonwood Creek, (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110055175322 (U.S. EPA ECHO) Agency record
Severity 3.8
Beaver Creek Gas Plant, Riverton
Major air pollution source.
EPA FRS registry ID 110000557095 (U.S. EPA ECHO) Agency record
Severity 3.5
Santa Fe Snyder Riverton Plant, Riverton
Major air pollution source.
EPA FRS registry ID 110010411651 (U.S. EPA ECHO) Agency record
Severity 3.5
Shoshone Utility Ft. Washakie, Fort Washakie
NPDES wastewater discharge permit.
EPA FRS registry ID 110012351132 (U.S. EPA ECHO) Agency record
Severity 3.5

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 Fremont 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 Fremont 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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