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Clark County, South Dakota: environmental and disease records

Cancer mortality in Clark County is 113.6 deaths per 100,000 people per year against a U.S. rate of 143.2. Federal databases place 52 regulated facilities, sites and hazards inside the county, led by Rail grade crossing (30), NPDES wastewater discharge permit (12), Major air pollution source (3). 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: 44.841, -97.7342.

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 Clark County compared with the United States
Cancer	Measure	County rate	U.S. rate	Times U.S.	95% interval	Years
All cancer	New cases	452.3	453.4	1x	367.3 to 552.1	2019-2023
All cancer	Deaths	113.6	143.2	0.79x	78.2 to 162.2	2020-2024

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 Clark County
Measure	County	U.S. median	Difference	Unit
Premature death	4,614.1	9,842.6	-53%	years of life lost before age 75 per 100,000
Life expectancy	81	75.3	+8%	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	63	96.9	-35%	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.

Formaldehyde11.59 per million
Carbon Tetrachloride2.89 per million
Acetaldehyde0.87 per million
Benzene0.51 per million

EPA Air Quality Index

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

Regulated facilities, sites and hazards by type

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

Rail grade crossing30
NPDES wastewater discharge permit12
Major air pollution source3
Public airport2
Wind power plant2
Gas station (mapped facility)1
Large greenhouse gas emitter1
Oil-fired power plant1

Highest-severity records

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

Clark (Sd), Clark
Oil-fired power plant.
Record ID 3341 (U.S. Energy Information Administration)
Severity 4
Clark (Sd), Clark
Major air pollution source.
EPA FRS registry ID 110017786528 (U.S. EPA ECHO) Agency record
Severity 3.5
Northern Border Pipeline Clark Cs#10, Clark
Major air pollution source.
EPA FRS registry ID 110043800599 (U.S. EPA ECHO) Agency record
Severity 3.5
Willow Lake Compressor Station, Willow Lake
Major air pollution source.
EPA FRS registry ID 110070132438 (U.S. EPA ECHO) Agency record
Severity 3.5
Northern Border Pipeline Clark Cs#10, Clark
Large greenhouse gas emitter.
EPA FRS registry ID 110043800599 (U.S. EPA ECHO) Agency record
Severity 2.5
Clark County, Clark
Public airport. O.
Record ID 8D7 (FAA / U.S. DOT)
Severity 2
Silver Lake Hutterian Bretheren Inc., Clark
NPDES wastewater discharge permit.
EPA FRS registry ID 110070669431 (U.S. EPA ECHO) Agency record
Severity 1.8
Raymond, Town Of, Raymond
NPDES wastewater discharge permit.
EPA FRS registry ID 110006692347 (U.S. EPA ECHO) Agency record
Severity 1.5
Clark, City Of, Clark
NPDES wastewater discharge permit.
EPA FRS registry ID 110006692427 (U.S. EPA ECHO) Agency record
Severity 1.5
Willow Lake, City Of, Willow Lake
NPDES wastewater discharge permit.
EPA FRS registry ID 110009705284 (U.S. EPA ECHO) Agency record
Severity 1.5
Garden City Wwtp, Garden City
NPDES wastewater discharge permit.
EPA FRS registry ID 110039847235 (U.S. EPA ECHO) Agency record
Severity 1.5
Clark Kampeska Rws (Wtp), Clark
NPDES wastewater discharge permit.
EPA FRS registry ID 110044255365 (U.S. EPA ECHO) Agency record
Severity 1.5
Pcn 04xc, De Smet
NPDES wastewater discharge permit.
EPA FRS registry ID 110071376261 (U.S. EPA ECHO) Agency record
Severity 1.5
Pcn 04ku, Vienna
NPDES wastewater discharge permit.
EPA FRS registry ID 110071661893 (U.S. EPA ECHO) Agency record
Severity 1.5
Wouter Snyman Farm, Naples
NPDES wastewater discharge permit.
EPA FRS registry ID 110071782988 (U.S. EPA ECHO) Agency record
Severity 1.5
Pcn 04ew, Bradley
NPDES wastewater discharge permit.
EPA FRS registry ID 110071931874 (U.S. EPA ECHO) Agency record
Severity 1.5
Pcn 069d, Garden City
NPDES wastewater discharge permit.
EPA FRS registry ID 110072144669 (U.S. EPA ECHO) Agency record
Severity 1.5
Clark Dairy - Stormwater Basins, Raymond
NPDES wastewater discharge permit.
EPA FRS registry ID 110072200640 (U.S. EPA ECHO) Agency record
Severity 1.5
Pleasant Ave, Vienna
Rail grade crossing.
Record ID 075106D (Federal Railroad Administration)
Severity 1.1
191st Street, Willow Lake
Rail grade crossing.
Record ID 075514N (Federal Railroad Administration)
Severity 1
428th Avenue, Willow Lake
Rail grade crossing.
Record ID 075515V (Federal Railroad Administration)
Severity 1
192nd Street, Willow Lake
Rail grade crossing.
Record ID 075516C (Federal Railroad Administration)
Severity 1
427th Avenue, Willow Lake
Rail grade crossing.
Record ID 075517J (Federal Railroad Administration)
Severity 1
426th Avenue, Willow Lake
Rail grade crossing.
Record ID 075518R (Federal Railroad Administration)
Severity 1
193rd Street, Willow Lake
Rail grade crossing.
Record ID 075519X (Federal Railroad Administration)
Severity 1

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 Clark 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 Clark 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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