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Clark County, Illinois: environmental and disease records

Cancer mortality in Clark County is 177.2 deaths per 100,000 people per year against a U.S. rate of 143.2, a statistically significant excess. The strongest disease signals are Lung & bronchus deaths at 1.6 times the U.S. rate. Federal databases place 174 regulated facilities, sites and hazards inside the county, led by Air permit holder (minor source) (44), Rail grade crossing (39), NPDES wastewater discharge permit (24). EPA AirToxScreen estimates a lifetime cancer risk from outdoor air toxics of 30 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: 39.327, -87.8023.

How this county ranks in Illinois

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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
Lung & bronchus	Deaths	48	30.2	1.59xSignificant	36.3 to 63	2020-2024
Non-Hodgkin lymphoma	New cases	25.9	18.5	1.4x	16.6 to 38.7	2019-2023
Lung & bronchus	New cases	70.1	51.8	1.35xSignificant	55.9 to 87.5	2019-2023
Kidney & renal pelvis	New cases	23	17.9	1.28x	14.8 to 34.5	2019-2023
All cancer	Deaths	177.2	143.2	1.24xSignificant	153.2 to 204.4	2020-2024
Bladder	New cases	22.5	18.7	1.2x	14.3 to 34.1	2019-2023
Melanoma of the skin	New cases	26.1	23.8	1.1x	16.6 to 39.3	2019-2023
All cancer	New cases	473.6	453.4	1.04x	431.7 to 518.7	2019-2023
Leukemia	New cases	14.6	14.5	1.01x	8.4 to 24.3	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 Clark County
Measure	County	U.S. median	Difference	Unit
Premature death	9,614.9	9,842.6	-2%	years of life lost before age 75 per 100,000
Life expectancy	74.9	75.3	-1%	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	84.6	96.9	-13%	deaths per 100,000
Drug overdose deaths	21.8	28.6	-24%	deaths per 100,000

Air toxics and air quality

EPA AirToxScreen 2020

Lifetime cancer risk from outdoor air toxics: 30 in a million. EPA treats 100 in a million as the upper end of acceptable risk and 1 in a million as the goal.

Formaldehyde18.23 per million
Carbon Tetrachloride2.96 per million
Acetaldehyde1.76 per million
Benzene0.79 per million

EPA Air Quality Index 2025

Monitored on 355 days: 333 good, 0 unhealthy for sensitive groups or worse. Median AQI 33, peak 87.

Regulated facilities, sites and hazards by type

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

Air permit holder (minor source)44
Rail grade crossing39
NPDES wastewater discharge permit24
Industrial wastewater discharge17
Gas station (mapped facility)12
Combined sewer overflow outfall11
Auto repair or body shop (mapped facility)5
Major air pollution source3
Small hazardous waste generator3
Public airport2
Brownfield property2
Hazardous waste transporter2
Oil-fired power plant2
TRI reporting facility2
Toxic chemical release facility (TRI)2
EPA air quality monitor1
Large hazardous waste generator1
Superfund (NPL) site1
Wastewater plant (mapped facility)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.

Velsicol Chemical Corp. (Marshall Plant), Marshall
Superfund (NPL) site. Hazard Ranking System score 48.8. NPL Site.
EPA site ID ILD000814673 (U.S. EPA Superfund (SEMS/NPL)) Agency record
Severity 10
Zf Active Safety & Electronics Us Llc, Marshall
Toxic chemical release facility (TRI). Chemicals: Toluene, Lead, Copper. Reports carcinogens. 9,426 lbs released over 5 years.
TRI facility ID 62441TRWTR902SS (U.S. EPA Toxics Release Inventory)
Severity 7.6
Id Castings, Martinsville
Toxic chemical release facility (TRI). Chemicals: Lead, Phenol, Manganese. Reports carcinogens. 1,035 lbs released over 5 years.
TRI facility ID 62442RWFND147WC (U.S. EPA Toxics Release Inventory)
Severity 6.8
Zf Active Safety & Electronics Us Llc, Marshall
TRI reporting facility.
EPA FRS registry ID 110000439384 (U.S. EPA ECHO) Agency record
Severity 5.3
Id Castings Of Illinois Llc, Martinsville
TRI reporting facility.
EPA FRS registry ID 110005815305 (U.S. EPA ECHO) Agency record
Severity 5.1
Mid-Illinois Quarry, Casey
NPDES wastewater discharge permit.
EPA FRS registry ID 110031269865 (U.S. EPA ECHO) Agency record
Severity 4.5
Quality Lime Company - Marshall, Marshall
NPDES wastewater discharge permit.
EPA FRS registry ID 110070884387 (U.S. EPA ECHO) Agency record
Severity 4.5
Marshall (Il), Marshall
Oil-fired power plant.
Record ID 949 (U.S. Energy Information Administration)
Severity 4
Casey City Of, Casey
Oil-fired power plant.
Record ID 56053 (U.S. Energy Information Administration)
Severity 4
Mid-Illinois Quarry, Casey
Air permit holder (minor source).
EPA FRS registry ID 110031269865 (U.S. EPA ECHO) Agency record
Severity 4
Casey - Northeast Stp, City Of, Casey
Combined sewer overflow outfall. Violation Identified.
NPDES permit IL0035084:001 (U.S. EPA NPDES)
Severity 4
Casey - Northeast Stp, City Of, Casey
Combined sewer overflow outfall. Violation Identified.
NPDES permit IL0035084:002 (U.S. EPA NPDES)
Severity 4
Casey - Northeast Stp, City Of, Casey
Combined sewer overflow outfall. Violation Identified.
NPDES permit IL0035084:003 (U.S. EPA NPDES)
Severity 4
Casey - Northeast Stp, City Of, Casey
Combined sewer overflow outfall. Violation Identified.
NPDES permit IL0035084:004 (U.S. EPA NPDES)
Severity 4
Casey - Northeast Stp, City Of, Casey
Combined sewer overflow outfall. Violation Identified.
NPDES permit IL0035084:A01 (U.S. EPA NPDES)
Severity 4
Casey - Northeast Stp, City Of, Casey
Combined sewer overflow outfall. Violation Identified.
NPDES permit IL0035084:INF (U.S. EPA NPDES)
Severity 4
Marshall Stp, City Of, Marshall
Combined sewer overflow outfall. Violation Identified.
NPDES permit IL0068365:001 (U.S. EPA NPDES)
Severity 4
Marshall Stp, City Of, Marshall
Combined sewer overflow outfall. Violation Identified.
NPDES permit IL0068365:002 (U.S. EPA NPDES)
Severity 4
Marshall Stp, City Of, Marshall
Combined sewer overflow outfall. Violation Identified.
NPDES permit IL0068365:003 (U.S. EPA NPDES)
Severity 4
Marshall Stp, City Of, Marshall
Combined sewer overflow outfall. Violation Identified.
NPDES permit IL0068365:004 (U.S. EPA NPDES)
Severity 4
Marshall Stp, City Of, Marshall
Combined sewer overflow outfall. Violation Identified.
NPDES permit IL0068365:INF (U.S. EPA NPDES)
Severity 4
Id Castings Of Illinois Llc, Martinsville
Major air pollution source.
EPA FRS registry ID 110001808376 (U.S. EPA ECHO) Agency record
Severity 3.8
Marshall Municipal Utilities, Marshall
Major air pollution source.
EPA FRS registry ID 110002070286 (U.S. EPA ECHO) Agency record
Severity 3.5
Marathon Pipe Line Llc, Martinsville
Major air pollution source.
EPA FRS registry ID 110007264432 (U.S. EPA ECHO) Agency record
Severity 3.5
Mason/Dixon Tank Lines, Marshall
Brownfield property.
EPA FRS registry ID 110015337081 (U.S. EPA Brownfields (ACRES)) Agency record
Severity 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 Clark County

Illinois 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.
Illinois vital statistics office
Death certificate counts by cause of death and residence tract or ZIP code, and the years behind the mortality measures above.
Illinois health department, environmental epidemiology
Health consultations or assessments by ATSDR or the state health department covering the county, and any exposure investigations.
Illinois 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.
Illinois 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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