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Natrona County, Wyoming: environmental and disease records

Cancer mortality in Natrona County is 146.6 deaths per 100,000 people per year against a U.S. rate of 143.2. Federal databases place 442 regulated facilities, sites and hazards inside the county, led by NPDES wastewater discharge permit (150), Rail grade crossing (58), Air permit holder (minor source) (45). 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: 43.0005, -106.7883.

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 Natrona County compared with the United States
CancerMeasureCounty rateU.S. rateTimes U.S.95% intervalYears
BladderDeaths64.11.46x3.9 to 8.72020-2024
BladderNew cases24.918.71.33xSignificant20.5 to 302019-2023
ThyroidNew cases17.3131.33xSignificant13.5 to 21.92019-2023
Kidney & renal pelvisDeaths4.33.41.26x2.6 to 6.72020-2024
Melanoma of the skinNew cases30.123.81.26xSignificant25.2 to 35.72019-2023
Childhood cancer (under 15)New cases20.516.41.25x11.7 to 33.42019-2023
PancreasDeaths13.511.31.19x10.4 to 17.32020-2024
All cancerDeaths146.6143.21.02x135.8 to 1582020-2024
Liver & bile ductDeaths6.56.60.98x4.5 to 9.12020-2024
LeukemiaDeaths5.65.70.98x3.6 to 8.22020-2024
Brain & nervous systemDeaths4.24.40.95x2.6 to 6.62020-2024
Kidney & renal pelvisNew cases1717.90.95x13.4 to 21.32019-2023
PancreasNew cases13.213.90.95x10.1 to 172019-2023
Lung & bronchusDeaths28.330.20.94x23.8 to 33.42020-2024
All cancerNew cases422.3453.40.93x403.5 to 441.72019-2023
Brain & nervous systemNew cases5.76.20.92x3.6 to 8.42019-2023
Non-Hodgkin lymphomaDeaths4.44.80.92x2.8 to 6.82020-2024
EsophagusNew cases3.94.60.85x2.2 to 6.32019-2023
StomachNew cases5.56.60.83x3.6 to 8.22019-2023
Lung & bronchusNew cases42.251.80.81x36.6 to 48.52019-2023
LeukemiaNew cases11.514.50.79x8.5 to 15.22019-2023
Liver & bile ductNew cases6.58.70.75x4.4 to 9.12019-2023
Non-Hodgkin lymphomaNew cases13.618.50.74x10.5 to 17.42019-2023

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 Natrona County
MeasureCountyU.S. medianDifferenceUnit
Premature death9,915.29,842.6+1%years of life lost before age 75 per 100,000
Life expectancy74.975.3-1%years
Child mortality71.959.8+20%deaths under age 18 per 100,000
Infant mortality86.2+29%deaths under age 1 per 1,000 live births
Injury deaths105.596.9+9%deaths per 100,000
Drug overdose deaths19.228.6-33%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.

  • Formaldehyde9.64 per million
  • Carbon Tetrachloride2.52 per million
  • Acetaldehyde0.75 per million
  • Benzene0.73 per million

EPA Air Quality Index 2025

Monitored on 365 days: 315 good, 0 unhealthy for sensitive groups or worse. Median AQI 42, peak 76.

Regulated facilities, sites and hazards by type

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

  • NPDES wastewater discharge permit150
  • Rail grade crossing58
  • Air permit holder (minor source)45
  • Small hazardous waste generator42
  • Gas station (mapped facility)29
  • Brownfield property27
  • Hazardous waste transporter27
  • Toxic chemical release facility (TRI)12
  • Scrapyard (mapped facility)9
  • TRI reporting facility9
  • Large hazardous waste generator8
  • Auto repair or body shop (mapped facility)6
  • Major air pollution source4
  • Heliport3
  • EPA air quality monitor2
  • Public airport2
  • Commercial airport2
  • Large greenhouse gas emitter2
  • Hydroelectric plant2
  • Landfill (mapped facility)1
  • Wind power plant1
  • 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.

  1. Sinclair Oil Corp. - Casper, Wyoming Refinery, Casper

    TRI reporting facility.

    EPA FRS registry ID 110011942719 (U.S. EPA ECHO) Agency record

    Severity 9

  2. Hf Sinclair Casper Refining Llc, Casper

    Toxic chemical release facility (TRI). Chemicals: n-Hexane, Xylene (mixed isomers), Toluene, Benzene and 4 more. Reports carcinogens. 95,887 lbs released over 5 years.

    TRI facility ID 82609LTTLM5700E (U.S. EPA Toxics Release Inventory)

    Severity 8.3

  3. Championx-Evansville Plant 108, Evansville

    Toxic chemical release facility (TRI). Chemicals: Methanol, Toluene, Naphthalene, Ethylene glycol and 4 more. Reports carcinogens. 72,612 lbs released over 5 years.

    TRI facility ID 82636NLCCH4900E (U.S. EPA Toxics Release Inventory)

    Severity 8.2

  4. Custom Fiberglass Inc, Casper

    Toxic chemical release facility (TRI). Chemicals: Styrene. Reports carcinogens. 28,099 lbs released over 5 years.

    TRI facility ID 82604CSTMF6750Z (U.S. EPA Toxics Release Inventory)

    Severity 7.9

  5. Tallgrass Midstream Llc - Casper Gas Plant & Compressor Stat, Casper

    Toxic chemical release facility (TRI). Chemicals: n-Hexane, Benzene, Methanol, Toluene and 1 more. Reports carcinogens. 7,460 lbs released over 5 years.

    TRI facility ID 8260WTLLGR575EY (U.S. EPA Toxics Release Inventory)

    Severity 7.5

  6. Nalco Co - Evansville Plant 108, Evansville

    TRI reporting facility.

    EPA FRS registry ID 110000468182 (U.S. EPA ECHO) Agency record

    Severity 6.9

  7. Sinclair Oil Corp. - Casper, Wyoming Refinery, Casper

    Major air pollution source.

    EPA FRS registry ID 110011942719 (U.S. EPA ECHO) Agency record

    Severity 6.5

  8. Dura-Line, Evansville

    Toxic chemical release facility (TRI). Chemicals: Lead And Lead Compounds, Mixture. 24,348 lbs released over 5 years.

    TRI facility ID 8263WDRLNX679SA (U.S. EPA Toxics Release Inventory)

    Severity 6.4

  9. Knife River Casper, Casper

    Toxic chemical release facility (TRI). Chemicals: Nitrate compounds (water dissociable; reportable only when in aqueous solution), Polycyclic aromatic compounds, Lead And Lead Compounds, Lead compounds and 2 more. Reports carcinogens. 125 lbs released over 5 years.

    TRI facility ID 82601KNFRV1461B (U.S. EPA Toxics Release Inventory)

    Severity 6.1

  10. Truenorth Steel-Casper, Casper

    Toxic chemical release facility (TRI). Chemicals: Polycyclic aromatic compounds, Benzo[g,h,i]perylene. Reports carcinogens. 107 lbs released over 5 years.

    TRI facility ID 82604CLVRT7242W (U.S. EPA Toxics Release Inventory)

    Severity 6.1

  11. Sinclair Oil Corp. - Casper, Wyoming Refinery, Casper

    Large hazardous waste generator.

    EPA FRS registry ID 110011942719 (U.S. EPA ECHO) Agency record

    Severity 6

  12. Sinclair Oil Corp. - Casper, Wyoming Refinery, Casper

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110011942719 (U.S. EPA ECHO) Agency record

    Severity 6

  13. Excal Inc., Mills

    Toxic chemical release facility (TRI). Chemicals: Nickel, Zinc (fume or dust), Lead, Copper. Reports carcinogens. 75 lbs released over 5 years.

    TRI facility ID 82644XCLNCONEEX (U.S. EPA Toxics Release Inventory)

    Severity 5.9

  14. Casper Brass Foundry, Mills

    TRI reporting facility.

    EPA FRS registry ID 110000468217 (U.S. EPA ECHO) Agency record

    Severity 5.9

  15. Custom Fiberglass Shop, Casper

    TRI reporting facility.

    EPA FRS registry ID 110000468173 (U.S. EPA ECHO) Agency record

    Severity 5.7

  16. Tallgrass Midstream Llc - Casper Gas Plant & Compressor Station, Casper

    TRI reporting facility.

    EPA FRS registry ID 110070645073 (U.S. EPA ECHO) Agency record

    Severity 5.6

  17. Hospital Waste Incinerator, Casper

    NPDES wastewater discharge permit. Penalties $20,000.

    EPA FRS registry ID 110005578151 (U.S. EPA ECHO) Agency record

    Severity 5.5

  18. Sinclair Oil Corp. - Casper, Wyoming Refinery, Casper

    Large greenhouse gas emitter.

    EPA FRS registry ID 110011942719 (U.S. EPA ECHO) Agency record

    Severity 5.5

  19. Hospital Waste Incinerator, Casper

    Air permit holder (minor source). Penalties $20,000.

    EPA FRS registry ID 110005578151 (U.S. EPA ECHO) Agency record

    Severity 5

  20. Casper/Natrona County Intl, Casper

    Commercial airport. O.

    Record ID CPR (FAA / U.S. DOT)

    Severity 5

  21. Casper Solid Waste Management Facility, Casper

    Major air pollution source.

    EPA FRS registry ID 110071087665 (U.S. EPA ECHO) Agency record

    Severity 4.8

  22. Knife River Casper, Casper

    TRI reporting facility.

    EPA FRS registry ID 110037148119 (U.S. EPA ECHO) Agency record

    Severity 4.5

  23. Baggs Man Camp-Nabors Drilling Usa Inc., Casper

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110038917081 (U.S. EPA ECHO) Agency record

    Severity 4.5

  24. Casper Facility - North Park, Casper

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110055164691 (U.S. EPA ECHO) Agency record

    Severity 4.5

  25. Casper Yard, Casper

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110055164959 (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 Natrona 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 Natrona 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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