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Walworth County, South Dakota: environmental and disease records

Cancer mortality in Walworth County is 133.8 deaths per 100,000 people per year against a U.S. rate of 143.2. Federal databases place 64 regulated facilities, sites and hazards inside the county, led by Rail grade crossing (37), NPDES wastewater discharge permit (13), Gas station (mapped facility) (5). 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: 45.4204, -100.0061.

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 Walworth County compared with the United States
Cancer	Measure	County rate	U.S. rate	Times U.S.	95% interval	Years
Lung & bronchus	New cases	53.9	51.8	1.04x	35.4 to 81.6	2019-2023
All cancer	Deaths	133.8	143.2	0.93x	101 to 175.8	2020-2024
All cancer	New cases	382.1	453.4	0.84x	322.2 to 451.3	2019-2023

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 Walworth County
Measure	County	U.S. median	Difference	Unit
Premature death	9,035.2	9,842.6	-8%	years of life lost before age 75 per 100,000
Life expectancy	76.9	75.3	+2%	years
Child mortality	n/a	59.8	n/a	deaths under age 18 per 100,000
Infant mortality	n/a	6.2	n/a	deaths under age 1 per 1,000 live births
Injury deaths	93	96.9	-4%	deaths per 100,000
Drug overdose deaths	n/a	28.6	n/a	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.

Formaldehyde10.81 per million
Carbon Tetrachloride2.88 per million
Acetaldehyde0.73 per million
Benzene0.52 per million

EPA Air Quality Index

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

Regulated facilities, sites and hazards by type

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

Rail grade crossing37
NPDES wastewater discharge permit13
Gas station (mapped facility)5
Auto repair or body shop (mapped facility)2
Brownfield property2
Air permit holder (minor source)1
Public airport1
Commercial airport1
Heliport1
Scrapyard (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.

Schmidt Property, Mobridge
Brownfield property.
EPA FRS registry ID 110071977693 (U.S. EPA Brownfields (ACRES)) Agency record
Severity 3
Selby Opera House, Selby
Brownfield property.
EPA FRS registry ID 110071977761 (U.S. EPA Brownfields (ACRES)) Agency record
Severity 3
Selby, City Of, Selby
NPDES wastewater discharge permit.
EPA FRS registry ID 110009791911 (U.S. EPA ECHO) Agency record
Severity 2.3
Hoven Muni, Hoven
Public airport. O.
Record ID 9F8 (FAA / U.S. DOT)
Severity 2
Mobridge Muni, Mobridge
Commercial airport. O.
Record ID MBG (FAA / U.S. DOT)
Severity 2
Mobridge, City Of (Wtp), Mobridge
NPDES wastewater discharge permit.
EPA FRS registry ID 110006663093 (U.S. EPA ECHO) Agency record
Severity 1.5
Java, Town Of, Java
NPDES wastewater discharge permit.
EPA FRS registry ID 110006692276 (U.S. EPA ECHO) Agency record
Severity 1.5
Mobridge, City Of (Biosolids), Mobridge
NPDES wastewater discharge permit.
EPA FRS registry ID 110006802549 (U.S. EPA ECHO) Agency record
Severity 1.5
Akaska, Town Of, Akaska
NPDES wastewater discharge permit.
EPA FRS registry ID 110009791369 (U.S. EPA ECHO) Agency record
Severity 1.5
Web Water Development Association ((Wtp)), Selby
NPDES wastewater discharge permit.
EPA FRS registry ID 110010952344 (U.S. EPA ECHO) Agency record
Severity 1.5
Walworth County Landfill, Selby
NPDES wastewater discharge permit.
EPA FRS registry ID 110013963103 (U.S. EPA ECHO) Agency record
Severity 1.5
Mobridge, City Of, Mobridge
NPDES wastewater discharge permit.
EPA FRS registry ID 110039846584 (U.S. EPA ECHO) Agency record
Severity 1.5
Glenham, Town Of, Glenham
NPDES wastewater discharge permit.
EPA FRS registry ID 110067175988 (U.S. EPA ECHO) Agency record
Severity 1.5
Renovation And Addition, Mobridge
NPDES wastewater discharge permit.
EPA FRS registry ID 110071320810 (U.S. EPA ECHO) Agency record
Severity 1.5
Web Water Moratorium Area Improvements Project: Contract 2020-3a Schedules 1 & 2, Mobridge
NPDES wastewater discharge permit.
EPA FRS registry ID 110071781950 (U.S. EPA ECHO) Agency record
Severity 1.5
Indian Creek Bank Restoration, Mobridge
NPDES wastewater discharge permit.
EPA FRS registry ID 110071914584 (U.S. EPA ECHO) Agency record
Severity 1.5
Pcn 08n6, Selby
NPDES wastewater discharge permit.
EPA FRS registry ID 110071924640 (U.S. EPA ECHO) Agency record
Severity 1.5
Private, Selby
Rail grade crossing.
Record ID 101667N (Federal Railroad Administration)
Severity 1.3
322nd Avenue, Bowdle
Rail grade crossing.
Record ID 393846J (Federal Railroad Administration)
Severity 1.3
321st Avenue, Bowdle
Rail grade crossing.
Record ID 393847R (Federal Railroad Administration)
Severity 1.3
Private, Java
Rail grade crossing.
Record ID 393848X (Federal Railroad Administration)
Severity 1.3
Private, Java
Rail grade crossing.
Record ID 393849E (Federal Railroad Administration)
Severity 1.3
318th Ave, Java
Rail grade crossing.
Record ID 393851F (Federal Railroad Administration)
Severity 1.3
130th Street, Java
Rail grade crossing.
Record ID 393853U (Federal Railroad Administration)
Severity 1.3
314th Avenue, Java
Rail grade crossing.
Record ID 393860E (Federal Railroad Administration)
Severity 1.3

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 Walworth 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 Walworth 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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