SD / county FIPS 46119 / county research

Sully County, South Dakota: environmental and disease records

Cancer mortality in Sully County is 138.9 deaths per 100,000 people per year against a U.S. rate of 143.2. Federal databases place 32 regulated facilities, sites and hazards inside the county, led by Rail grade crossing (20), NPDES wastewater discharge permit (7), Major air pollution source (1). 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: 44.7242, -100.1493.

How this county ranks in South Dakota

View on the heat map Scan 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 Sully County compared with the United States
Cancer	Measure	County rate	U.S. rate	Times U.S.	95% interval	Years
All cancer	New cases	520.3	453.4	1.15x	378.2 to 702.6	2019-2023
All cancer	Deaths	138.9	143.2	0.97x	72.2 to 247.3	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 Sully County
Measure	County	U.S. median	Difference	Unit
Premature death	8,861.2	9,842.6	-10%	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.

Formaldehyde10.62 per million
Carbon Tetrachloride2.87 per million
Acetaldehyde0.75 per million
Benzene0.44 per million

EPA Air Quality Index

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

Regulated facilities, sites and hazards by type

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

Rail grade crossing20
NPDES wastewater discharge permit7
Major air pollution source1
Public airport1
Large greenhouse gas emitter1
TRI reporting facility1
Toxic chemical release facility (TRI)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.

Ring-Neck Energy & Feed Llc, Onida
Toxic chemical release facility (TRI). Chemicals: Acetaldehyde, Methanol, Ammonia, n-Hexane and 4 more. Reports carcinogens. 139,621 lbs released over 5 years.
TRI facility ID 5756WRNGNC91RED (U.S. EPA Toxics Release Inventory)
Severity 8.4
Ringneck Energy, Llc, Onida
TRI reporting facility.
EPA FRS registry ID 110070543313 (U.S. EPA ECHO) Agency record
Severity 6.8
Ringneck Energy, Llc, Onida
Major air pollution source.
EPA FRS registry ID 110070543313 (U.S. EPA ECHO) Agency record
Severity 4.3
Ringneck Energy, Llc, Onida
NPDES wastewater discharge permit.
EPA FRS registry ID 110070543313 (U.S. EPA ECHO) Agency record
Severity 3.8
Ringneck Energy, Llc, Onida
Large greenhouse gas emitter.
EPA FRS registry ID 110070543313 (U.S. EPA ECHO) Agency record
Severity 3.3
Onida Muni, Onida
Public airport. O.
Record ID 98D (FAA / U.S. DOT)
Severity 2
Onida, City Of (Wtp), Onida
NPDES wastewater discharge permit.
EPA FRS registry ID 110009791225 (U.S. EPA ECHO) Agency record
Severity 1.5
Agar, Town Of, Agar
NPDES wastewater discharge permit.
EPA FRS registry ID 110009791350 (U.S. EPA ECHO) Agency record
Severity 1.5
Sutton Bay Golf, Llc., Agar
NPDES wastewater discharge permit.
EPA FRS registry ID 110012684238 (U.S. EPA ECHO) Agency record
Severity 1.5
Onida Utility Improvements, Onida
NPDES wastewater discharge permit.
EPA FRS registry ID 110071279685 (U.S. EPA ECHO) Agency record
Severity 1.5
Sully Buttes Substation Grading, Onida
NPDES wastewater discharge permit.
EPA FRS registry ID 110071319573 (U.S. EPA ECHO) Agency record
Severity 1.5
Sully Lake Substation, Pierre
NPDES wastewater discharge permit.
EPA FRS registry ID 110071848303 (U.S. EPA ECHO) Agency record
Severity 1.5
Private Road, Onida
Rail grade crossing.
Record ID 189643V (Federal Railroad Administration)
Severity 1.2
Ash Avenue, Onida
Rail grade crossing.
Record ID 189644C (Federal Railroad Administration)
Severity 1.2
Cedar Avenue, Onida
Rail grade crossing.
Record ID 189645J (Federal Railroad Administration)
Severity 1.2
Ginseng Avenue, Onida
Rail grade crossing.
Record ID 189646R (Federal Railroad Administration)
Severity 1.2
186th Street, Onida
Rail grade crossing.
Record ID 189647X (Federal Railroad Administration)
Severity 1.2
305th Avenue, Onida
Rail grade crossing.
Record ID 189648E (Federal Railroad Administration)
Severity 1.2
187th Street, Onida
Rail grade crossing.
Record ID 189649L (Federal Railroad Administration)
Severity 1.2
188th Street, Onida
Rail grade crossing.
Record ID 189650F (Federal Railroad Administration)
Severity 1.2
306th Avenue, Onida
Rail grade crossing.
Record ID 189651M (Federal Railroad Administration)
Severity 1.2
189th Street, Onida
Rail grade crossing.
Record ID 189652U (Federal Railroad Administration)
Severity 1.2
190th Street, Onida
Rail grade crossing.
Record ID 189653B (Federal Railroad Administration)
Severity 1.2
191st Street, Onida
Rail grade crossing.
Record ID 189654H (Federal Railroad Administration)
Severity 1.2
193rd Street, Blunt
Rail grade crossing.
Record ID 189655P (Federal Railroad Administration)
Severity 1.2

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 Sully 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 Sully 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 Sully County View on the heat map All South Dakota counties