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Ziebach County, South Dakota: environmental and disease records

Cancer mortality in Ziebach County is 165.1 deaths per 100,000 people per year against a U.S. rate of 143.2. Federal databases place 20 regulated facilities, sites and hazards inside the county, led by NPDES wastewater discharge permit (9), Brownfield property (6), Public airport (2). 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: 44.9721, -101.5682.

How this county ranks in South 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 Ziebach County compared with the United States
CancerMeasureCounty rateU.S. rateTimes U.S.95% intervalYears
All cancerDeaths165.1143.21.15x94.2 to 266.92020-2024
All cancerNew cases256.4453.40.57x172.9 to 366.82019-2023

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 Ziebach County
MeasureCountyU.S. medianDifferenceUnit
Premature death25,117.99,842.6+155%years of life lost before age 75 per 100,000
Life expectancy65.875.3-13%years
Child mortality326.759.8+447%deaths under age 18 per 100,000
Infant mortalityn/a6.2n/adeaths under age 1 per 1,000 live births
Injury deaths123.896.9+28%deaths per 100,000
Drug overdose deathsn/a28.6n/adeaths 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.

  • Formaldehyde9.64 per million
  • Carbon Tetrachloride2.83 per million
  • Acetaldehyde0.66 per million
  • Benzene0.44 per million

EPA Air Quality Index

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

Regulated facilities, sites and hazards by type

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

  • NPDES wastewater discharge permit9
  • Brownfield property6
  • Public airport2
  • Gas station (mapped facility)2
  • 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. Cherry Creek Wastewater Treatment Facility, Eagle Butte

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110020148892 (U.S. EPA ECHO) Agency record

    Severity 4.3

  2. Iron Lightning Day School, Dupree

    Brownfield property.

    EPA FRS registry ID 110071971451 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  3. St. Brotherhood Church, Dupree

    Brownfield property.

    EPA FRS registry ID 110071971452 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  4. Old Head Start Building - Cherry Creek, Cherry Creek

    Brownfield property.

    EPA FRS registry ID 110071972018 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  5. Old Community Building - Red Scaffold, Red Scaffold

    Brownfield property.

    EPA FRS registry ID 110071972019 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  6. Old Community Building - Dupree, Dupree

    Brownfield property.

    EPA FRS registry ID 110071972020 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  7. Old Gas Station - Red Scaffold, Red Scaffold

    Brownfield property.

    EPA FRS registry ID 110071973042 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  8. Cheyenne Eagle Butte, Eagle Butte

    Public airport. O.

    Record ID 84D (FAA / U.S. DOT)

    Severity 2

  9. Dupree, Dupree

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110010692553 (U.S. EPA ECHO) Agency record

    Severity 1.5

  10. Habitat For Humanity, Eagle Butte

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110020143691 (U.S. EPA ECHO) Agency record

    Severity 1.5

  11. Iron Lightning Wastewater Facility, Eagle Butte

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110020143717 (U.S. EPA ECHO) Agency record

    Severity 1.5

  12. Thunder Butte Wastewater Treatment Facility, Eagle Butte

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110020143726 (U.S. EPA ECHO) Agency record

    Severity 1.5

  13. Bridger Wastewater Treatment Facility, Eagle Butte

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110020148883 (U.S. EPA ECHO) Agency record

    Severity 1.5

  14. Red Scaffold Wastewater Facility, Eagle Butte

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110020148927 (U.S. EPA ECHO) Agency record

    Severity 1.5

  15. Dupree School Classroom Addition, Dupree

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110071337452 (U.S. EPA ECHO) Agency record

    Severity 1.5

  16. Wastewater System Improvements Phase 3 - Collection System Improvements, Dupree

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110072189410 (U.S. EPA ECHO) Agency record

    Severity 1.5

  17. Lakota Thrifty Mart

    Gas station (mapped facility). Mapped facility presence only; no compliance or exposure measurements.

    Record ID way/1349599508 (OpenStreetMap contributors) Agency record

    Severity 1

  18. Cenex

    Gas station (mapped facility). Mapped facility presence only; no compliance or exposure measurements.

    Record ID way/258564640 (OpenStreetMap contributors) Agency record

    Severity 1

  19. Cheyenne River Health Center, Eagle Butte

    Heliport. O.

    Record ID 04SD (FAA / U.S. DOT)

    Severity 0.5

  20. Dorsey Ranch, Glad Valley

    Public airport. O.

    Record ID 1SD0 (FAA / U.S. DOT)

    Severity 0.5

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 Ziebach County

  • South 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 Ziebach County, and their findings.

  • South 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.

  • South Dakota health department, environmental epidemiology

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

  • South 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.

  • South 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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