Envyrofax
Scan an Address

SD / county FIPS 46041 / county research

Dewey County, South Dakota: environmental and disease records

Cancer mortality in Dewey County is 287.8 deaths per 100,000 people per year against a U.S. rate of 143.2, a statistically significant excess. Federal databases place 53 regulated facilities, sites and hazards inside the county, led by NPDES wastewater discharge permit (25), Brownfield property (21), Gas station (mapped facility) (4). 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: 45.0951, -100.9062.

How this county ranks in South Dakota

View on the heat mapScan an address in this county

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 Dewey County compared with the United States
CancerMeasureCounty rateU.S. rateTimes U.S.95% intervalYears
Lung & bronchusNew cases111.151.82.14xSignificant68.8 to 168.82019-2023
All cancerDeaths287.8143.22.01xSignificant212.5 to 379.62020-2024
All cancerNew cases713.7453.41.57xSignificant599.1 to 8432019-2023

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 Dewey County
MeasureCountyU.S. medianDifferenceUnit
Premature death41,916.39,842.6+326%years of life lost before age 75 per 100,000
Life expectancy56.775.3-25%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 deaths200.296.9+107%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.

  • Formaldehyde10.07 per million
  • Carbon Tetrachloride2.84 per million
  • Acetaldehyde0.67 per million
  • Benzene0.46 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.

  • NPDES wastewater discharge permit25
  • Brownfield property21
  • Gas station (mapped facility)4
  • Public airport3

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. Eagle Butte Wwtf, Eagle Butte

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110028184373 (U.S. EPA ECHO) Agency record

    Severity 3.5

  2. Old School Building (White Horse), Unk

    Brownfield property.

    EPA FRS registry ID 110038721354 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  3. Rodeo Dump -Cheyenne River Sioux Tribe, Eagle Butte

    Brownfield property.

    EPA FRS registry ID 110038741528 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  4. Holloway Garage Building, Eagle Butte

    Brownfield property.

    EPA FRS registry ID 110038747531 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  5. Swiftbird Day School, Swiftbird

    Brownfield property.

    EPA FRS registry ID 110071969471 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  6. Abandone Eagle Butte Homes, Eagle Butte

    Brownfield property.

    EPA FRS registry ID 110071969511 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  7. Toby D Used Furniture Building, Eagle Butte

    Brownfield property.

    EPA FRS registry ID 110071971468 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  8. Property 1 - South Side Of Jefferson St., Eagle Butte

    Brownfield property.

    EPA FRS registry ID 110071973121 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  9. Property 2 - South Side Of Center St., Eagle Butte

    Brownfield property.

    EPA FRS registry ID 110071973122 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  10. Property 3 - Nw Corner Of 2nd St And Dupree St., Eagle Butte

    Brownfield property.

    EPA FRS registry ID 110071973123 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  11. Property 4 - South Side Of 2nd St, Eagle Butte

    Brownfield property.

    EPA FRS registry ID 110071973124 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  12. Property 5 - Se Corner Washington St & Dupree St., Eagle Butte

    Brownfield property.

    EPA FRS registry ID 110071973125 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  13. Property 6 - West Side Of Washington St., Eagle Butte

    Brownfield property.

    EPA FRS registry ID 110071973126 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  14. Prop 7 - West Side Washington St & 2nd N Of A St., Eagle Butte

    Brownfield property.

    EPA FRS registry ID 110071973127 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  15. Property 8 - East Corner Washington St & A St., Eagle Butte

    Brownfield property.

    EPA FRS registry ID 110071973128 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  16. Prop 9 - 2nd S Of 3rd St On West Side Lincoln St., Eagle Butte

    Brownfield property.

    EPA FRS registry ID 110071973129 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  17. Crst Old Ihs Apartments, Eagle Butte

    Brownfield property.

    EPA FRS registry ID 110071973679 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  18. Property 10 - Sw Corner Center St. And Seseme St., Eagle Butte

    Brownfield property.

    EPA FRS registry ID 110071974114 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  19. Property 11 - N Of Spruce St End And E Frontier St, Eagle Butte

    Brownfield property.

    EPA FRS registry ID 110071974115 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  20. Crst Administration Building, Eagle Butte

    Brownfield property.

    EPA FRS registry ID 110071976885 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  21. Crst Habitat For Humanity Building, Eagle Butte

    Brownfield property.

    EPA FRS registry ID 110071976886 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  22. Former Conoco Gas Station And 212 Liquor Store, Eagle Butte

    Brownfield property.

    EPA FRS registry ID 110071986887 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  23. Timber Lake Wastewater Treatment Facility, Timber Lake

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110022910812 (U.S. EPA ECHO) Agency record

    Severity 3

  24. Grand River Casino And Resort, Mobridge

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110020142656 (U.S. EPA ECHO) Agency record

    Severity 2.8

  25. Nh-8 0212(184)143, Dewey County, Pcn 04xg, Lantry

    NPDES wastewater discharge permit. Penalties $2,100.

    EPA FRS registry ID 110071320763 (U.S. EPA ECHO) Agency record

    Severity 2.5

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 Dewey 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 Dewey 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.

Scan an address in Dewey CountyView on the heat mapAll South Dakota counties