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Hyde County, South Dakota: environmental and disease records

Cancer mortality in Hyde County is 173.4 deaths per 100,000 people per year against a U.S. rate of 143.2. Federal databases place 31 regulated facilities, sites and hazards inside the county, led by Rail grade crossing (19), NPDES wastewater discharge permit (6), Public airport (2). 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: 44.538, -99.4821.

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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 Hyde County compared with the United States
Cancer	Measure	County rate	U.S. rate	Times U.S.	95% interval	Years
All cancer	Deaths	173.4	143.2	1.21x	99.7 to 291.1	2020-2024
All cancer	New cases	351.2	453.4	0.77x	242.2 to 502.4	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 Hyde County
Measure	County	U.S. median	Difference	Unit
Premature death	n/a	9,842.6	n/a	years of life lost before age 75 per 100,000
Life expectancy	n/a	75.3	n/a	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	n/a	96.9	n/a	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.

Formaldehyde10.86 per million
Carbon Tetrachloride2.86 per million
Acetaldehyde0.74 per million
Benzene0.45 per million

EPA Air Quality Index

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

Regulated facilities, sites and hazards by type

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

Rail grade crossing19
NPDES wastewater discharge permit6
Public airport2
Brownfield property2
Wind power plant2

Highest-severity records

The 25 records with the highest Envyrofax severity in the county, with the agency identifier to cite in a records request.

Girls Dorm, Crow Creek Tribal School, Stephan
Brownfield property.
EPA FRS registry ID 110038749539 (U.S. EPA Brownfields (ACRES)) Agency record
Severity 3
Highmore Auditorium, Highmore
Brownfield property.
EPA FRS registry ID 110071985840 (U.S. EPA Brownfields (ACRES)) Agency record
Severity 3
Highmore, City Of, Highmore
NPDES wastewater discharge permit.
EPA FRS registry ID 110009692591 (U.S. EPA ECHO) Agency record
Severity 2
Highmore Muni, Highmore
Public airport. O.
Record ID 9D0 (FAA / U.S. DOT)
Severity 2
Stephan Lagoon System, Stephan
NPDES wastewater discharge permit.
EPA FRS registry ID 110032598035 (U.S. EPA ECHO) Agency record
Severity 1.5
2nd Street Sw 2020 Street Improvements, Highmore
NPDES wastewater discharge permit.
EPA FRS registry ID 110071279617 (U.S. EPA ECHO) Agency record
Severity 1.5
Parallel Taxiway Extension, Highmore
NPDES wastewater discharge permit.
EPA FRS registry ID 110071321268 (U.S. EPA ECHO) Agency record
Severity 1.5
Track Project, Highmore
NPDES wastewater discharge permit.
EPA FRS registry ID 110071814177 (U.S. EPA ECHO) Agency record
Severity 1.5
Pratt Substation Grading, Holabird
NPDES wastewater discharge permit.
EPA FRS registry ID 110071878783 (U.S. EPA ECHO) Agency record
Severity 1.5
342nd Avenue, Highmore
Rail grade crossing.
Record ID 189773S (Federal Railroad Administration)
Severity 1.3
341st Avenue, Highmore
Rail grade crossing.
Record ID 189775F (Federal Railroad Administration)
Severity 1.3
340th Avenue, Highmore
Rail grade crossing.
Record ID 189776M (Federal Railroad Administration)
Severity 1.3
Road, Highmore
Rail grade crossing.
Record ID 189778B (Federal Railroad Administration)
Severity 1.3
338th Avenue, Highmore
Rail grade crossing.
Record ID 189780C (Federal Railroad Administration)
Severity 1.3
Commercial Avenue, Highmore
Rail grade crossing.
Record ID 189781J (Federal Railroad Administration)
Severity 1.3
Sd 47, Highmore
Rail grade crossing.
Record ID 189782R (Federal Railroad Administration)
Severity 1.3
Private Road, Highmore
Rail grade crossing.
Record ID 189783X (Federal Railroad Administration)
Severity 1.3
336th Avenue, Highmore
Rail grade crossing.
Record ID 189784E (Federal Railroad Administration)
Severity 1.3
335th Avenue, Highmore
Rail grade crossing.
Record ID 189785L (Federal Railroad Administration)
Severity 1.3
334th Avenue, Highmore
Rail grade crossing.
Record ID 189786T (Federal Railroad Administration)
Severity 1.3
333rd Avenue, Highmore
Rail grade crossing.
Record ID 189787A (Federal Railroad Administration)
Severity 1.3
331st Avenue, Highmore
Rail grade crossing.
Record ID 189788G (Federal Railroad Administration)
Severity 1.3
330th Avenue, Highmore
Rail grade crossing.
Record ID 189789N (Federal Railroad Administration)
Severity 1.3
Not On Nstri On 329th Avenue, Highmore
Rail grade crossing.
Record ID 189790H (Federal Railroad Administration)
Severity 1.3
Oak Street, Highmore
Rail grade crossing.
Record ID 189791P (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 Hyde 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 Hyde 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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