NE / county FIPS 31165 / county research

Sioux County, Nebraska: environmental and disease records

Federal databases place 26 regulated facilities, sites and hazards inside the county, led by Rail grade crossing (17), Air permit holder (minor source) (4), NPDES wastewater discharge permit (4). 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: 42.5048, -103.7666.

How this county ranks in Nebraska

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 Sioux County compared with the United States
Cancer	Measure	County rate	U.S. rate	Times U.S.	95% interval	Years
All cancer	New cases	185.6	453.4	0.41x	101.7 to 324.5	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 Sioux 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.

Formaldehyde9.92 per million
Carbon Tetrachloride2.61 per million
Acetaldehyde0.67 per million
Pahpom0.48 per million

EPA Air Quality Index 2025

Monitored on 214 days: 187 good, 0 unhealthy for sensitive groups or worse. Median AQI 42, peak 100.

Regulated facilities, sites and hazards by type

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

Rail grade crossing17
Air permit holder (minor source)4
NPDES wastewater discharge permit4
EPA air quality monitor1

Highest-severity records

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

Matthew A. Tighe, Morrill
NPDES wastewater discharge permit.
EPA FRS registry ID 110006617492 (U.S. EPA ECHO) Agency record
Severity 1.5
Sioux County Feeders, Mitchell
NPDES wastewater discharge permit.
EPA FRS registry ID 110045776932 (U.S. EPA ECHO) Agency record
Severity 1.5
Agate Fossil Beds-20061 Treatment, Harrison
NPDES wastewater discharge permit.
EPA FRS registry ID 110050908915 (U.S. EPA ECHO) Agency record
Severity 1.5
Sioux County Farms, Morrill
NPDES wastewater discharge permit.
EPA FRS registry ID 110070155262 (U.S. EPA ECHO) Agency record
Severity 1.5
Linn St, Harrison
Rail grade crossing.
Record ID 064844N (Federal Railroad Administration)
Severity 1.3
Private, Harrison
Rail grade crossing.
Record ID 064845V (Federal Railroad Administration)
Severity 1.3
Toadstool Park, Crawford
Rail grade crossing.
Record ID 064846C (Federal Railroad Administration)
Severity 1.3
Orella Rd, Crawford
Rail grade crossing.
Record ID 064847J (Federal Railroad Administration)
Severity 1.3
Private, Crawford
Rail grade crossing.
Record ID 064848R (Federal Railroad Administration)
Severity 1.3
Private, Harrison
Rail grade crossing.
Record ID 064850S (Federal Railroad Administration)
Severity 1.3
Private, Harrison
Rail grade crossing.
Record ID 064852F (Federal Railroad Administration)
Severity 1.3
Private, Harrison
Rail grade crossing.
Record ID 064853M (Federal Railroad Administration)
Severity 1.3
Hat Creek Rd, Crawford
Rail grade crossing.
Record ID 064854U (Federal Railroad Administration)
Severity 1.3
Neb/Sodak St Line, Harrison
Rail grade crossing.
Record ID 064856H (Federal Railroad Administration)
Severity 1.3
Rd 197s, Henry
Rail grade crossing.
Record ID 089198J (Federal Railroad Administration)
Severity 1.3
South F Road, Henry
Rail grade crossing.
Record ID 909778S (Federal Railroad Administration)
Severity 1.3
Private, Henry
Rail grade crossing.
Record ID 909782G (Federal Railroad Administration)
Severity 1.3
Private, Henry
Rail grade crossing.
Record ID 909784V (Federal Railroad Administration)
Severity 1.3
South C Road, Henry
Rail grade crossing.
Record ID 909785C (Federal Railroad Administration)
Severity 1.3
Private, Morrill
Rail grade crossing.
Record ID 909788X (Federal Railroad Administration)
Severity 1.3
Private Uppr, Henry
Rail grade crossing.
Record ID 921467T (Federal Railroad Administration)
Severity 1.3
Harrison Burn Site, Harrison
Air permit holder (minor source).
EPA FRS registry ID 110007128759 (U.S. EPA ECHO) Agency record
Severity 1
Sioux Ranch 22-11, Morrill
Air permit holder (minor source).
EPA FRS registry ID 110045764954 (U.S. EPA ECHO) Agency record
Severity 1
Henry Burn Site, Henry
Air permit holder (minor source).
EPA FRS registry ID 110064589869 (U.S. EPA ECHO) Agency record
Severity 1
G H Coffee Park, Harrison
Air permit holder (minor source).
EPA FRS registry ID 110066859698 (U.S. EPA ECHO) Agency record
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 Sioux County

Nebraska 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 Sioux County, and their findings.
Nebraska vital statistics office
Death certificate counts by cause of death and residence tract or ZIP code, and the years behind the mortality measures above.
Nebraska health department, environmental epidemiology
Health consultations or assessments by ATSDR or the state health department covering the county, and any exposure investigations.
Nebraska 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.
Nebraska 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 Sioux County View on the heat map All Nebraska counties