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Harding County, South Dakota: environmental and disease records

Federal databases place 13 regulated facilities, sites and hazards inside the county, led by NPDES wastewater discharge permit (5), Public airport (4), Gas station (mapped facility) (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: 45.6065, -103.4963.

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 Harding County compared with the United States
Cancer	Measure	County rate	U.S. rate	Times U.S.	95% interval	Years
All cancer	New cases	348.8	453.4	0.77x	227.9 to 514.3	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 Harding 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: 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.

Formaldehyde8.9 per million
Carbon Tetrachloride2.76 per million
Acetaldehyde0.62 per million
Benzene0.42 per million

EPA Air Quality Index

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

Regulated facilities, sites and hazards by type

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

NPDES wastewater discharge permit5
Public airport4
Gas station (mapped facility)2
Major air pollution source1
Air permit holder (minor source)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.

Continental Resources Inc, Buffalo
Major air pollution source.
EPA FRS registry ID 110033141981 (U.S. EPA ECHO) Agency record
Severity 4
Harding County, Buffalo
Public airport. O.
Record ID 9D2 (FAA / U.S. DOT)
Severity 2
Buffalo, Town Of, Buffalo
NPDES wastewater discharge permit.
EPA FRS registry ID 110006663235 (U.S. EPA ECHO) Agency record
Severity 1.5
Citation Oil And Gas Corporation, Buffalo
NPDES wastewater discharge permit.
EPA FRS registry ID 110009692564 (U.S. EPA ECHO) Agency record
Severity 1.5
Camp Crook, Town Of, Camp Crook
NPDES wastewater discharge permit.
EPA FRS registry ID 110009791109 (U.S. EPA ECHO) Agency record
Severity 1.5
Pcn 06td, Ludlow
NPDES wastewater discharge permit.
EPA FRS registry ID 110071897421 (U.S. EPA ECHO) Agency record
Severity 1.5
Aml - 2026 New Salem Phase Aml Project Revegetation Site, Bismarck
NPDES wastewater discharge permit.
EPA FRS registry ID 110072202125 (U.S. EPA ECHO) Agency record
Severity 1.5
Spyglass Cedar Creek Compressor Station, Buffalo
Air permit holder (minor source).
EPA FRS registry ID 110040511531 (U.S. EPA ECHO) Agency record
Severity 1
Conoco
Gas station (mapped facility). Mapped facility presence only; no compliance or exposure measurements.
Record ID node/13203260100 (OpenStreetMap contributors) Agency record
Severity 1
Fuel Station
Gas station (mapped facility). Mapped facility presence only; no compliance or exposure measurements.
Record ID node/14022704936 (OpenStreetMap contributors) Agency record
Severity 1
Bledsoe Ranch, Hoover
Public airport. O.
Record ID 0SD3 (FAA / U.S. DOT)
Severity 0.5
Sky Ranch For Boys, Camp Crook
Public airport. O.
Record ID SD33 (FAA / U.S. DOT)
Severity 0.5
Tennant Ranch, Camp Crook
Public airport. O.
Record ID SD76 (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 Harding 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 Harding 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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