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Crook County, Wyoming: environmental and disease records

Cancer mortality in Crook County is 155.9 deaths per 100,000 people per year against a U.S. rate of 143.2. Federal databases place 113 regulated facilities, sites and hazards inside the county, led by NPDES wastewater discharge permit (66), Rail grade crossing (19), Air permit holder (minor source) (8). 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: 44.6022, -104.5707.

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 Crook County compared with the United States
Cancer	Measure	County rate	U.S. rate	Times U.S.	95% interval	Years
Bladder	New cases	29.3	18.7	1.57x	16.2 to 50.4	2019-2023
All cancer	Deaths	155.9	143.2	1.09x	123.6 to 195.2	2020-2024
Lung & bronchus	Deaths	29.5	30.2	0.98x	17.4 to 48.8	2020-2024
All cancer	New cases	434.6	453.4	0.96x	377.3 to 499	2019-2023
Lung & bronchus	New cases	41.4	51.8	0.8x	26.9 to 63.1	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 Crook County
Measure	County	U.S. median	Difference	Unit
Premature death	7,578.4	9,842.6	-23%	years of life lost before age 75 per 100,000
Life expectancy	76.8	75.3	+2%	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	107	96.9	+10%	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: 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.

Formaldehyde10.37 per million
Carbon Tetrachloride2.62 per million
Acetaldehyde0.8 per million
Pahpom0.52 per million

EPA Air Quality Index

No EPA air quality monitor reports daily AQI for this county.

Regulated facilities, sites and hazards by type

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

NPDES wastewater discharge permit66
Rail grade crossing19
Air permit holder (minor source)8
Public airport7
Gas station (mapped facility)7
Major air pollution source3
Brownfield property1
Hazardous waste transporter1
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.

Robinson Ranch Unit, (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110055168955 (U.S. EPA ECHO) Agency record
Severity 4.5
Wood 395-2 Federal 768, (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110055176571 (U.S. EPA ECHO) Agency record
Severity 4.5
Bush Pit, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110055190145 (U.S. EPA ECHO) Agency record
Severity 4.5
Maupin Pit (Lqd Sp0512), (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110055203872 (U.S. EPA ECHO) Agency record
Severity 4.5
Reisland Pit (Lqd Sp0512), (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110070355200 (U.S. EPA ECHO) Agency record
Severity 4.5
Barton Field, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110055198398 (U.S. EPA ECHO) Agency record
Severity 3.8
Hulett Mill, Crook
Major air pollution source.
EPA FRS registry ID 110006152509 (U.S. EPA ECHO) Agency record
Severity 3.5
Bentonite Performance Minerals Plant, Aladdin
Major air pollution source.
EPA FRS registry ID 110010411624 (U.S. EPA ECHO) Agency record
Severity 3.5
Colony East And West Plants (American Colloid Company), Sundance
Major air pollution source.
EPA FRS registry ID 110010411633 (U.S. EPA ECHO) Agency record
Severity 3.5
Davis-Meyer-Muddy Batteries, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110055194855 (U.S. EPA ECHO) Agency record
Severity 3.5
Moorcroft Wastewater Lagoon, Moorcroft
NPDES wastewater discharge permit.
EPA FRS registry ID 110055197601 (U.S. EPA ECHO) Agency record
Severity 3.5
Pine Haven Wwtp, Pine Haven
NPDES wastewater discharge permit.
EPA FRS registry ID 110055200367 (U.S. EPA ECHO) Agency record
Severity 3.5
Lease #Wyw66387 Wildfire A, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110064421709 (U.S. EPA ECHO) Agency record
Severity 3.5
Acc Pit, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110070256925 (U.S. EPA ECHO) Agency record
Severity 3.5
Crook County School District 1, Sundance
Brownfield property.
EPA FRS registry ID 110012371502 (U.S. EPA Brownfields (ACRES)) Agency record
Severity 3
Barton Lease Tank #4554, (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110055198209 (U.S. EPA ECHO) Agency record
Severity 2.8
Colony (Lqd Pt0620 And Pt0622), (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110055207930 (U.S. EPA ECHO) Agency record
Severity 2.8
Zim Fed 5-11, (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110064867087 (U.S. EPA ECHO) Agency record
Severity 2.8
Ross Isr Project Mine Unit 4 Pump Tests, Oshoto
NPDES wastewater discharge permit.
EPA FRS registry ID 110071952806 (U.S. EPA ECHO) Agency record
Severity 2.8
T Federal #10-16, Producting Oil Well With Assoc, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110055204363 (U.S. EPA ECHO) Agency record
Severity 2.5
Gillette-Madison Pipeline Project M13, M14, And M15 Pumps And Equipment Contract, Moorcroft
NPDES wastewater discharge permit.
EPA FRS registry ID 110071963491 (U.S. EPA ECHO) Agency record
Severity 2.5
South Fork Road, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110055169099 (U.S. EPA ECHO) Agency record
Severity 2.3
Wood 395-3, Wells 1 And 2, (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110055176562 (U.S. EPA ECHO) Agency record
Severity 2.3
Fowler Lease, (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110071785108 (U.S. EPA ECHO) Agency record
Severity 2.3
Twiford Forney 1,3,4 And The Baum 2-17 Lease., (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110055163923 (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 Crook 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 Crook 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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