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Converse County, Wyoming: environmental and disease records

Cancer mortality in Converse County is 134.9 deaths per 100,000 people per year against a U.S. rate of 143.2. Federal databases place 248 regulated facilities, sites and hazards inside the county, led by NPDES wastewater discharge permit (85), Rail grade crossing (72), Air permit holder (minor source) (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: 42.8849, -105.4857.

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 Converse County compared with the United States
Cancer	Measure	County rate	U.S. rate	Times U.S.	95% interval	Years
Bladder	New cases	24.3	18.7	1.3x	15 to 37.7	2019-2023
Melanoma of the skin	New cases	28	23.8	1.18x	17.7 to 42.6	2019-2023
Lung & bronchus	Deaths	28.9	30.2	0.96x	18.6 to 43.3	2020-2024
All cancer	Deaths	134.9	143.2	0.94x	111.3 to 162.4	2020-2024
Lung & bronchus	New cases	46.8	51.8	0.9x	34 to 63.4	2019-2023
All cancer	New cases	385	453.4	0.85x	344.2 to 429.7	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 Converse County
Measure	County	U.S. median	Difference	Unit
Premature death	7,553.2	9,842.6	-23%	years of life lost before age 75 per 100,000
Life expectancy	77.2	75.3	+3%	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	113.5	96.9	+17%	deaths per 100,000
Drug overdose deaths	31.5	28.6	+10%	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.

Formaldehyde9.35 per million
Carbon Tetrachloride2.55 per million
Acetaldehyde0.61 per million
Pahpom0.53 per million

EPA Air Quality Index 2025

Monitored on 365 days: 351 good, 0 unhealthy for sensitive groups or worse. Median AQI 40, peak 63.

Regulated facilities, sites and hazards by type

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

NPDES wastewater discharge permit85
Rail grade crossing72
Air permit holder (minor source)19
Major air pollution source8
Gas station (mapped facility)8
Wind power plant8
Brownfield property7
Toxic chemical release facility (TRI)7
TRI reporting facility6
EPA air quality monitor5
Public airport5
Small hazardous waste generator5
Hazardous waste transporter4
Large greenhouse gas emitter3
Scrapyard (mapped facility)2
Commercial airport1
Auto repair or body shop (mapped facility)1
Large hazardous waste generator1
Coal power plant1

Highest-severity records

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

Pacificorp Dave Johnston Plant, Glenrock
Toxic chemical release facility (TRI). Chemicals: Barium And Barium Compounds, Barium compounds (except for barium sulfate (CAS No. 7727-43-7)), Manganese And Manganese Compounds, Vanadium compounds and 4 more. Reports carcinogens. 7,945,413 lbs released over 5 years.
TRI facility ID 82637PCFCR1591T (U.S. EPA Toxics Release Inventory)
Severity 9.8
Steamboat Processing Facility, Douglas
Toxic chemical release facility (TRI). Chemicals: n-Hexane, Benzene, Ethylene glycol, Cyclohexane. Reports carcinogens. 27,465 lbs released over 5 years.
TRI facility ID 8263WSTMBTNE14N (U.S. EPA Toxics Release Inventory)
Severity 7.9
Pacificorp Dave Johnston Plant, Glenrock
TRI reporting facility. Penalties $30,000.
EPA FRS registry ID 110013320245 (U.S. EPA ECHO) Agency record
Severity 7.8
Sage Creek Gas Plant, Glenrock
Toxic chemical release facility (TRI). Chemicals: Benzene, n-Hexane, Toluene, Methanol and 1 more. Reports carcinogens. 20,648 lbs released over 5 years.
TRI facility ID 8263WSGCRKSECTI (U.S. EPA Toxics Release Inventory)
Severity 7.8
Douglas Gas Plant, Douglas
Toxic chemical release facility (TRI). Chemicals: n-Hexane, Methanol, Benzene, Ethylene glycol. Reports carcinogens. 13,940 lbs released over 5 years.
TRI facility ID 8263WDGLSG252HW (U.S. EPA Toxics Release Inventory)
Severity 7.7
Pecan Pipeline (Wyoming) Jewell Gas Plant, Douglas
Toxic chemical release facility (TRI). Chemicals: n-Hexane, Cyclohexane, Benzene, Methanol and 4 more. Reports carcinogens. 13,040 lbs released over 5 years.
TRI facility ID 8263WJWLLGSECTI (U.S. EPA Toxics Release Inventory)
Severity 7.7
Bucking Horse Plant, Douglas
Toxic chemical release facility (TRI). Chemicals: n-Hexane, Benzene, Toluene, Cyclohexane and 2 more. Reports carcinogens. 10,644 lbs released over 5 years.
TRI facility ID 8263WBCKNG477CL (U.S. EPA Toxics Release Inventory)
Severity 7.6
Dave Johnston, Glen Rock
Coal power plant.
Record ID 4158 (U.S. Energy Information Administration)
Severity 6.7
Sage Creek Gas Plant, Converse
TRI reporting facility.
EPA FRS registry ID 110070508034 (U.S. EPA ECHO) Agency record
Severity 5.8
Steamboat Processing Facility, Douglas
TRI reporting facility.
EPA FRS registry ID 110070835244 (U.S. EPA ECHO) Agency record
Severity 5.8
Douglas Gas Plant, Douglas
TRI reporting facility.
EPA FRS registry ID 110071434093 (U.S. EPA ECHO) Agency record
Severity 5.7
Bucking Horse Plant, Douglas
TRI reporting facility.
EPA FRS registry ID 110055522028 (U.S. EPA ECHO) Agency record
Severity 5.6
Jewell Gas Plant, Converse
TRI reporting facility.
EPA FRS registry ID 110071017188 (U.S. EPA ECHO) Agency record
Severity 5.5
Pacificorp Dave Johnston Plant, Glenrock
Major air pollution source. Penalties $30,000.
EPA FRS registry ID 110013320245 (U.S. EPA ECHO) Agency record
Severity 4.5
Glenrock Pit, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110055163996 (U.S. EPA ECHO) Agency record
Severity 4.5
Wdeq/Lqd Permit To Mine Pt0585, (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110055174500 (U.S. EPA ECHO) Agency record
Severity 4.5
Glenrock Transfer Station, Parkerton
NPDES wastewater discharge permit.
EPA FRS registry ID 110055175652 (U.S. EPA ECHO) Agency record
Severity 4.5
Russell Quarry (October 2021), Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110055175803 (U.S. EPA ECHO) Agency record
Severity 4.5
Douglas Cng Facility, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110055204531 (U.S. EPA ECHO) Agency record
Severity 4.5
Vr Mine (Lqd Pt0684), (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110055206557 (U.S. EPA ECHO) Agency record
Severity 4.5
Former Conoco Refinery And Glenrock Station, (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110056162682 (U.S. EPA ECHO) Agency record
Severity 4.5
State 14-36 Ph & 24-36 Ph, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110064420817 (U.S. EPA ECHO) Agency record
Severity 4.5
Uprr Bill Facility, Bill
NPDES wastewater discharge permit.
EPA FRS registry ID 110064614056 (U.S. EPA ECHO) Agency record
Severity 4.5
Owl Thunder Basin Swd Wastewater Disposal Facility, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110064626917 (U.S. EPA ECHO) Agency record
Severity 4.5
Fetterman Pit (Lqd Pt0821), (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110064780045 (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 Converse 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 Converse 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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