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Johnson County, Wyoming: environmental and disease records

Cancer mortality in Johnson County is 115.2 deaths per 100,000 people per year against a U.S. rate of 143.2. Federal databases place 128 regulated facilities, sites and hazards inside the county, led by NPDES wastewater discharge permit (73), Air permit holder (minor source) (33), Gas station (mapped facility) (9). 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: 43.9665, -106.5691.

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 Johnson County compared with the United States
Cancer	Measure	County rate	U.S. rate	Times U.S.	95% interval	Years
Melanoma of the skin	New cases	29.2	23.8	1.23x	16.5 to 48.9	2019-2023
All cancer	New cases	368.6	453.4	0.81x	321.9 to 421.2	2019-2023
All cancer	Deaths	115.2	143.2	0.8x	92.2 to 143.7	2020-2024
Lung & bronchus	New cases	33.2	51.8	0.64x	21 to 51.7	2019-2023
Lung & bronchus	Deaths	19	30.2	0.63x	11 to 33	2020-2024

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 Johnson County
Measure	County	U.S. median	Difference	Unit
Premature death	7,176.2	9,842.6	-27%	years of life lost before age 75 per 100,000
Life expectancy	79.3	75.3	+5%	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	100.4	96.9	+4%	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.

Formaldehyde8.08 per million
Carbon Tetrachloride2.54 per million
Acetaldehyde0.66 per million
Pahpom0.58 per million

EPA Air Quality Index 2025

Monitored on 363 days: 337 good, 0 unhealthy for sensitive groups or worse. Median AQI 41, peak 84.

Regulated facilities, sites and hazards by type

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

NPDES wastewater discharge permit73
Air permit holder (minor source)33
Gas station (mapped facility)9
EPA air quality monitor2
Hazardous waste transporter2
Scrapyard (mapped facility)2
Major air pollution source1
Public airport1
Commercial airport1
Auto repair or body shop (mapped facility)1
Small hazardous waste generator1
Landfill (mapped facility)1
Rail grade crossing1

Highest-severity records

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

Mr. R'S Auto Salvage, Buffalo
NPDES wastewater discharge permit.
EPA FRS registry ID 110042150720 (U.S. EPA ECHO) Agency record
Severity 4.5
Taylor, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110055176278 (U.S. EPA ECHO) Agency record
Severity 4.5
Buffalo City Yard, Buffalo
NPDES wastewater discharge permit.
EPA FRS registry ID 110055183242 (U.S. EPA ECHO) Agency record
Severity 4.5
Hanson Place Gravel Storage Area & Asphalt Plant, Buffalo
NPDES wastewater discharge permit.
EPA FRS registry ID 110055190305 (U.S. EPA ECHO) Agency record
Severity 4.5
Shell Creek Pit (Lqd Pt0798), Buffalo
NPDES wastewater discharge permit.
EPA FRS registry ID 110055196489 (U.S. EPA ECHO) Agency record
Severity 4.5
Pine Ridge One Pit (Ararat Rock) (Lqd Sp0799), Kaycee
NPDES wastewater discharge permit.
EPA FRS registry ID 110055196700 (U.S. EPA ECHO) Agency record
Severity 4.5
Cross H. Ranch, Inc. Gravel Pit, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110055201598 (U.S. EPA ECHO) Agency record
Severity 4.5
Wedin Pit (Lqd Pt0720, Prev. Sussex Sand & Gravel), (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110070502227 (U.S. EPA ECHO) Agency record
Severity 4.5
Powder River Rest Area I-90, Buffalo
NPDES wastewater discharge permit.
EPA FRS registry ID 110055177712 (U.S. EPA ECHO) Agency record
Severity 4.3
Oil Canyon, (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110062654961 (U.S. EPA ECHO) Agency record
Severity 4.3
Mr. R'S Auto Salvage, Buffalo
Air permit holder (minor source).
EPA FRS registry ID 110042150720 (U.S. EPA ECHO) Agency record
Severity 4
East Tisdale Field, Morton Lease (New 2016), (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110069568783 (U.S. EPA ECHO) Agency record
Severity 4
Wgr Asset Hold Table Mountain Comp Stat, Unk
Major air pollution source.
EPA FRS registry ID 110046102150 (U.S. EPA ECHO) Agency record
Severity 3.5
Bullwhacker Creek - Dry Fork Land, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110055178953 (U.S. EPA ECHO) Agency record
Severity 3.3
Wall Creek Quarry (Lqd Et1571), (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110055204274 (U.S. EPA ECHO) Agency record
Severity 2.8
Sierra Construction Waste Water Pond #1, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110056358427 (U.S. EPA ECHO) Agency record
Severity 2.8
North Fork Cellars Oil Well, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110055170915 (U.S. EPA ECHO) Agency record
Severity 2.5
Adami - Indian Creek, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110055179621 (U.S. EPA ECHO) Agency record
Severity 2.5
North Tisdale Field, (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110055194828 (U.S. EPA ECHO) Agency record
Severity 2.3
Fourmile Creek Portion Of The Cat Creek Pod, (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110055204693 (U.S. EPA ECHO) Agency record
Severity 2.3
South Dry Fork Area, (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110062655808 (U.S. EPA ECHO) Agency record
Severity 2.3
Reno Field Section 19-45-79 (New 2016), (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110069601693 (U.S. EPA ECHO) Agency record
Severity 2.3
North Fork Field, (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110055168919 (U.S. EPA ECHO) Agency record
Severity 2
Crazy Woman Creek, (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110055176759 (U.S. EPA ECHO) Agency record
Severity 2
River Road Cbm Facility, (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110055202953 (U.S. EPA ECHO) Agency record
Severity 2

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 Johnson 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 Johnson 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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