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Sioux County, North Dakota: environmental and disease records

Cancer mortality in Sioux County is 119.8 deaths per 100,000 people per year against a U.S. rate of 143.2. Federal databases place 53 regulated facilities, sites and hazards inside the county, led by Brownfield property (30), NPDES wastewater discharge permit (18), Gas station (mapped facility) (3). 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: 46.1856, -100.8984.

How this county ranks in North Dakota

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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 Sioux County compared with the United States
CancerMeasureCounty rateU.S. rateTimes U.S.95% intervalYears
All cancerDeaths119.8143.20.84x72.7 to 186.52020-2024
All cancerNew cases354.9453.40.78x264.7 to 464.92019-2023

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 Sioux County
MeasureCountyU.S. medianDifferenceUnit
Premature death35,129.39,842.6+257%years of life lost before age 75 per 100,000
Life expectancy59.675.3-21%years
Child mortalityn/a59.8n/adeaths under age 18 per 100,000
Infant mortalityn/a6.2n/adeaths under age 1 per 1,000 live births
Injury deaths207.896.9+114%deaths per 100,000
Drug overdose deaths8628.6+201%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.

  • Formaldehyde10.71 per million
  • Carbon Tetrachloride2.88 per million
  • Acetaldehyde0.71 per million
  • Benzene0.54 per million

EPA Air Quality Index

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

Regulated facilities, sites and hazards by type

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

  • Brownfield property30
  • NPDES wastewater discharge permit18
  • Gas station (mapped facility)3
  • Public airport1
  • 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.

  1. Prairie Knights Casino & Resort, Fort Yates

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110020152289 (U.S. EPA ECHO) Agency record

    Severity 3.5

  2. Tribal Facility 33 (Aka Bia Residence), Fort Yates

    Brownfield property.

    EPA FRS registry ID 110038741546 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  3. Old Teacher'S Quarters, Fort Yates

    Brownfield property.

    EPA FRS registry ID 110040479185 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  4. Old Stockade Building, Fort Yates

    Brownfield property.

    EPA FRS registry ID 110040479194 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  5. Long Soldier Dump Site, Fort Yates

    Brownfield property.

    EPA FRS registry ID 110040479210 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  6. Old Wishing Well Bar, Selfridge

    Brownfield property.

    EPA FRS registry ID 110043241701 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  7. Old Planning Building, Fort Yates

    Brownfield property.

    EPA FRS registry ID 110043241756 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  8. Old Church House, Porcupine

    Brownfield property.

    EPA FRS registry ID 110071963776 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  9. Old Tribal Office, Fort Yates

    Brownfield property.

    EPA FRS registry ID 110071963778 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  10. Cannon Ball Dumpsite, Cannon Ball

    Brownfield property.

    EPA FRS registry ID 110071966001 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  11. Old Elementary School, Fort Yates

    Brownfield property.

    EPA FRS registry ID 110071966006 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  12. Standing Rock Sioux Tribe Epa Building, Fort Yates

    Brownfield property.

    EPA FRS registry ID 110071966009 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  13. Old Sitting Bull College, Fort Yates

    Brownfield property.

    EPA FRS registry ID 110071966010 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  14. Old Warrior Motel, Ft. Yates

    Brownfield property.

    EPA FRS registry ID 110071967633 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  15. Standing Rock Reservation Sioux Tribe, Fort Yates

    Brownfield property.

    EPA FRS registry ID 110071985350 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  16. 5017 Redtail Hawk Street, Fort Yates, North Dakota, Fort Yates

    Brownfield property.

    EPA FRS registry ID 110071985351 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  17. 266 Hawk Street, Fort Yates, North Dakota, Fort Yates

    Brownfield property.

    EPA FRS registry ID 110071985352 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  18. 205 Walleye Street, Fort Yates, North Dakota, Fort Yates

    Brownfield property.

    EPA FRS registry ID 110071985353 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  19. 5329 Hawk Street, Fort Yates, North Dakota, Fort Yates

    Brownfield property.

    EPA FRS registry ID 110071986327 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  20. 198 Golden Eagle Avenue, Fort Yates, North Dakota, Fort Yates

    Brownfield property.

    EPA FRS registry ID 110071986328 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  21. 321 Wolf Street, Fort Yates, North Dakota, Fort Yates

    Brownfield property.

    EPA FRS registry ID 110071986329 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  22. 548 Warrior Street, Fort Yates, North Dakota, Fort Yates

    Brownfield property.

    EPA FRS registry ID 110071986330 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  23. 5322 Wolf Street, Fort Yates, North Dakota, Fort Yates

    Brownfield property.

    EPA FRS registry ID 110071986331 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  24. 6152 Chairman Street, Cannonball, North Dakota, Cannon Ball

    Brownfield property.

    EPA FRS registry ID 110071986332 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  25. 6156 Chairman Street, Cannonball, North Dakota, Cannon Ball

    Brownfield property.

    EPA FRS registry ID 110071986333 (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 Sioux County

  • North Dakota 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 Sioux County, and their findings.

  • North Dakota vital statistics office

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

  • North Dakota health department, environmental epidemiology

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

  • North Dakota 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.

  • North Dakota 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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