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Niobrara County, Wyoming: environmental and disease records

Cancer mortality in Niobrara County is 85.7 deaths per 100,000 people per year against a U.S. rate of 143.2. Federal databases place 107 regulated facilities, sites and hazards inside the county, led by NPDES wastewater discharge permit (35), Rail grade crossing (34), Air permit holder (minor source) (26). One correctional facility operates in the county, at least one with health-based drinking water violations on record. 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: 43.0723, -104.4759.

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 Niobrara County compared with the United States
Cancer	Measure	County rate	U.S. rate	Times U.S.	95% interval	Years
All cancer	Deaths	85.7	143.2	0.6x	49.8 to 143.9	2020-2024
All cancer	New cases	245.5	453.4	0.54x	177.4 to 335.3	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 Niobrara County
Measure	County	U.S. median	Difference	Unit
Premature death	5,958.2	9,842.6	-39%	years of life lost before age 75 per 100,000
Life expectancy	78.3	75.3	+4%	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	135.2	96.9	+39%	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.

Formaldehyde9.19 per million
Carbon Tetrachloride2.56 per million
Acetaldehyde0.57 per million
Pahpom0.48 per million

EPA Air Quality Index

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

Regulated facilities, sites and hazards by type

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

NPDES wastewater discharge permit35
Rail grade crossing34
Air permit holder (minor source)26
Brownfield property4
Gas station (mapped facility)2
Public airport1
Commercial airport1
Auto repair or body shop (mapped facility)1
Correctional facility (prison or jail)1
Scrapyard (mapped facility)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.

Boner Bros. Pit, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110055168946 (U.S. EPA ECHO) Agency record
Severity 4.5
Wilson Pit, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110055190047 (U.S. EPA ECHO) Agency record
Severity 4.5
District 3 Maintenance Facilities, (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110055191073 (U.S. EPA ECHO) Agency record
Severity 4.5
Christenson Pit, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110055196728 (U.S. EPA ECHO) Agency record
Severity 4.5
Timberline Manville Quarry (Lqd Sp0712), (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110055205816 (U.S. EPA ECHO) Agency record
Severity 4.5
Vermilion East Finn Oil Field Project (Field Permit), Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110066890476 (U.S. EPA ECHO) Agency record
Severity 4.5
Trailhead 3, Phase 7, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110055202631 (U.S. EPA ECHO) Agency record
Severity 4.3
Hensen Livestock 13-29, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110070818665 (U.S. EPA ECHO) Agency record
Severity 4.3
Lance Creek Apex 1&4 Consolidated, (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110055175572 (U.S. EPA ECHO) Agency record
Severity 4
Lance Creek Field, Bell Edgemont Facility, (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110055203079 (U.S. EPA ECHO) Agency record
Severity 3.8
Pgc Llc 35-1, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110055177650 (U.S. EPA ECHO) Agency record
Severity 3.5
Stagecoach Museum Property, Lusk
Brownfield property.
EPA FRS registry ID 110071970664 (U.S. EPA Brownfields (ACRES)) Agency record
Severity 3
Former Lusk Jailhouse, Lusk
Brownfield property.
EPA FRS registry ID 110071975876 (U.S. EPA Brownfields (ACRES)) Agency record
Severity 3
Oberst Building, Lusk
Brownfield property.
EPA FRS registry ID 110071985232 (U.S. EPA Brownfields (ACRES)) Agency record
Severity 3
Mahnke Building, Lusk
Brownfield property.
EPA FRS registry ID 110071985233 (U.S. EPA Brownfields (ACRES)) Agency record
Severity 3
East Lance Creek Unit A Battery, (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110055175518 (U.S. EPA ECHO) Agency record
Severity 3
Bell Pasture Roads, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110055169981 (U.S. EPA ECHO) Agency record
Severity 2.8
Tupper Federal Tank Battery, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110055164352 (U.S. EPA ECHO) Agency record
Severity 2.5
Lance Creek Apex 2 Battery, (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110055175545 (U.S. EPA ECHO) Agency record
Severity 2.5
Lance Creek Field, O'Rohlff Battery (Lance Creek Sheep Central Tank Battery), (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110055199583 (U.S. EPA ECHO) Agency record
Severity 2.3
Greasewood Field, Unknown
NPDES wastewater discharge permit.
EPA FRS registry ID 110055200474 (U.S. EPA ECHO) Agency record
Severity 2
Lusk Muni, Lusk
Commercial airport. O.
Record ID LSK (FAA / U.S. DOT)
Severity 2
Lusk Sewage Treatment Plant
Wastewater plant (mapped facility). Mapped facility presence only; no compliance or exposure measurements.
Record ID way/1461834020 (OpenStreetMap contributors) Agency record
Severity 2
Leimser Lease Battery, (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110055169829 (U.S. EPA ECHO) Agency record
Severity 1.8
Finley State 1-36 & 2-36, (Unknown City)
NPDES wastewater discharge permit.
EPA FRS registry ID 110055181832 (U.S. EPA ECHO) Agency record
Severity 1.8

Correctional facilities

Prisons, jails and corrections operations with an EPA facility record, and the drinking water and wastewater compliance attached to them.

Lusk, Town Of-Chlorinator (Prison Well House), Lusk
EPA FRS registry ID
110012360596
Water system
WY5600032
Health-based violations
12 all time, 0 in 5 years
All violations
118
Contaminants cited
Coliform (TCR), Gross Alpha, Excl. Radon and U
Wastewater permit
None on record
EPA detailed facility report

Discovery / public records

Records to request for Niobrara 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 Niobrara 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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