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Navajo County, Arizona: environmental and disease records

Cancer mortality in Navajo County is 138 deaths per 100,000 people per year against a U.S. rate of 143.2. Federal databases place 891 regulated facilities, sites and hazards inside the county, led by Industrial wastewater discharge (346), NPDES wastewater discharge permit (195), Brownfield property (122). 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: 35.2753, -110.2973.

How this county ranks in Arizona

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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 Navajo County compared with the United States
CancerMeasureCounty rateU.S. rateTimes U.S.95% intervalYears
Kidney & renal pelvisDeaths4.63.41.35x3.1 to 6.62020-2024
Non-Hodgkin lymphomaDeaths5.94.81.23x4.2 to 82020-2024
StomachDeaths32.71.11x1.9 to 4.72020-2024
Liver & bile ductDeaths7.16.61.08x5.3 to 9.32020-2024
Brain & nervous systemNew cases6.66.21.06x4.6 to 9.22019-2023
LeukemiaNew cases1514.51.03x12 to 18.52019-2023
ThyroidNew cases13131x10 to 16.52019-2023
Liver & bile ductNew cases8.58.70.98x6.5 to 112019-2023
All cancerDeaths138143.20.96x129.3 to 147.22020-2024
StomachNew cases6.16.60.92x4.3 to 8.42019-2023
EsophagusDeaths3.43.70.92x2.2 to 52020-2024
BladderDeaths3.74.10.9x2.4 to 5.52020-2024
LeukemiaDeaths4.95.70.86x3.4 to 72020-2024
Kidney & renal pelvisNew cases15.317.90.85x12.4 to 18.72019-2023
EsophagusNew cases3.94.60.85x2.6 to 5.72019-2023
BladderNew cases15.718.70.84x12.9 to 192019-2023
Non-Hodgkin lymphomaNew cases15.418.50.83x12.6 to 18.82019-2023
PancreasDeaths9.411.30.83x7.2 to 122020-2024
All cancerNew cases363453.40.8x348.4 to 378.12019-2023
Brain & nervous systemDeaths3.44.40.77x2.1 to 5.22020-2024
Melanoma of the skinNew cases17.423.80.73x14.4 to 20.92019-2023
Lung & bronchusDeaths19.730.20.65x16.7 to 23.22020-2024
PancreasNew cases8.413.90.6x6.4 to 10.92019-2023
Lung & bronchusNew cases29.551.80.57x25.7 to 33.72019-2023

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 Navajo County
MeasureCountyU.S. medianDifferenceUnit
Premature death21,728.29,842.6+121%years of life lost before age 75 per 100,000
Life expectancy67.175.3-11%years
Child mortality82.559.8+38%deaths under age 18 per 100,000
Infant mortality8.46.2+36%deaths under age 1 per 1,000 live births
Injury deaths187.596.9+93%deaths per 100,000
Drug overdose deaths4228.6+47%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.

  • Formaldehyde10.55 per million
  • Carbon Tetrachloride2.43 per million
  • Acetaldehyde0.64 per million
  • Pahpom0.33 per million

EPA Air Quality Index 2025

Monitored on 365 days: 363 good, 0 unhealthy for sensitive groups or worse. Median AQI 13, peak 54.

Regulated facilities, sites and hazards by type

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

  • Industrial wastewater discharge346
  • NPDES wastewater discharge permit195
  • Brownfield property122
  • Gas station (mapped facility)63
  • Rail grade crossing50
  • Auto repair or body shop (mapped facility)27
  • Wastewater plant (mapped facility)22
  • Air permit holder (minor source)12
  • Small hazardous waste generator11
  • Public airport8
  • Scrapyard (mapped facility)7
  • Major air pollution source5
  • Commercial airport3
  • Heliport3
  • EPA air quality monitor2
  • Hazardous waste transporter2
  • Landfill (mapped facility)2
  • Wind power plant2
  • TRI reporting facility2
  • Toxic chemical release facility (TRI)2
  • Large greenhouse gas emitter1
  • Large hazardous waste generator1
  • Biomass power plant1
  • Coal power plant1
  • Solar 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.

  1. Cholla, Joseph City

    TRI reporting facility.

    EPA FRS registry ID 110017206192 (U.S. EPA ECHO) Agency record

    Severity 9

  2. Cholla Power Plant, Joseph City

    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, Manganese compounds and 4 more. Reports carcinogens. 518,530 lbs released over 5 years.

    TRI facility ID 86032CHLLPOLDUS (U.S. EPA Toxics Release Inventory)

    Severity 8.9

  3. Cholla, Joseph City

    Coal power plant.

    Record ID 113 (U.S. Energy Information Administration)

    Severity 6.4

  4. Rhinehart Oil Co. Holbrook Bulk Plant, Holbrook

    Toxic chemical release facility (TRI). Chemicals: Xylene (mixed isomers), Ethylbenzene, Benzene, Toluene and 4 more. Reports carcinogens. 265 lbs released over 5 years.

    TRI facility ID 86025BRDCB107N1 (U.S. EPA Toxics Release Inventory)

    Severity 6.4

  5. Cholla, Joseph City

    Major air pollution source.

    EPA FRS registry ID 110017206192 (U.S. EPA ECHO) Agency record

    Severity 6.3

  6. Cholla, Joseph City

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110017206192 (U.S. EPA ECHO) Agency record

    Severity 5.8

  7. Show Low Rgnl, Show Low

    Commercial airport. O.

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

    Severity 5

  8. Us Fish & Wildlife Service Alchesay/Williams Creek National Fish Hatchery Comple, Whiteriver

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110006891541 (U.S. EPA ECHO) Agency record

    Severity 4.5

  9. Hon-Dah Regional Wwtf, Whiteriver

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110012810299 (U.S. EPA ECHO) Agency record

    Severity 4.3

  10. Timberline Mhp, Show Low

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110013100820 (U.S. EPA ECHO) Agency record

    Severity 4.3

  11. Whiteriver Sewage Lagoon, Whiteriver

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110024527635 (U.S. EPA ECHO) Agency record

    Severity 4.3

  12. Kayenta Wwtf, Kayenta

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110010062699 (U.S. EPA ECHO) Agency record

    Severity 4

  13. Bradco Holbrook Terminal And Cardlock, Holbrook

    TRI reporting facility.

    EPA FRS registry ID 110039497256 (U.S. EPA ECHO) Agency record

    Severity 4

  14. Bison Ranch Wwtp, Overgaard

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110070112295 (U.S. EPA ECHO) Agency record

    Severity 3.8

  15. Peabody Western Coal-Black Mesa Complex, Kayenta

    Major air pollution source.

    EPA FRS registry ID 110007977840 (U.S. EPA ECHO) Agency record

    Severity 3.5

  16. El Paso Natural Gas Co- Dilkon, Dilkon

    Major air pollution source.

    EPA FRS registry ID 110010419430 (U.S. EPA ECHO) Agency record

    Severity 3.5

  17. Painted Desert Landfill (Pen-Rob), Joseph City

    Major air pollution source.

    EPA FRS registry ID 110012625169 (U.S. EPA ECHO) Agency record

    Severity 3.5

  18. Snowflake White Mountain Power Plant, Snowflake

    Major air pollution source.

    EPA FRS registry ID 110031037759 (U.S. EPA ECHO) Agency record

    Severity 3.5

  19. Northern Arizona Academy, Winslow

    Brownfield property.

    EPA FRS registry ID 110003410050 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  20. Snowflake Tire, Snowflake

    Brownfield property.

    EPA FRS registry ID 110039306907 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  21. City Of Winslow- Former Wood Treatment Facility, Winslow

    Brownfield property.

    EPA FRS registry ID 110040132576 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  22. City Of Winslow- Clear Creek Pump Station Property, Winslow

    Brownfield property.

    EPA FRS registry ID 110042111639 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  23. Gorman Avenue Cemetery Expansion, Winslow

    Brownfield property.

    EPA FRS registry ID 110042112380 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  24. Standin' On The Corner Park, Winslow

    Brownfield property.

    EPA FRS registry ID 110042112399 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  25. Mcgee Trading Post, Pinon

    Brownfield property.

    EPA FRS registry ID 110042301103 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

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 Navajo County

  • Arizona 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 Navajo County, and their findings.

  • Arizona vital statistics office

    Death certificate counts by cause of death and residence tract or ZIP code, and the years behind the mortality measures above.

  • Arizona health department, environmental epidemiology

    Health consultations or assessments by ATSDR or the state health department covering the county, and any exposure investigations.

  • Arizona 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.

  • Arizona 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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