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Walworth County, Wisconsin: environmental and disease records

Cancer mortality in Walworth County is 146.8 deaths per 100,000 people per year against a U.S. rate of 143.2. The strongest disease signals are Esophagus deaths at 1.5 times the U.S. rate. Federal databases place 484 regulated facilities, sites and hazards inside the county, led by NPDES wastewater discharge permit (173), Rail grade crossing (103), Gas station (mapped facility) (51). 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: 42.6675, -88.5412.

How this county ranks in Wisconsin

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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 Walworth County compared with the United States
Cancer	Measure	County rate	U.S. rate	Times U.S.	95% interval	Years
Melanoma of the skin	Deaths	3	2	1.5x	1.8 to 4.8	2020-2024
Leukemia	New cases	21.6	14.5	1.49xSignificant	18.1 to 25.6	2019-2023
Esophagus	Deaths	5.5	3.7	1.49xSignificant	3.9 to 7.5	2020-2024
Esophagus	New cases	6.5	4.6	1.41xSignificant	4.8 to 8.8	2019-2023
Melanoma of the skin	New cases	33.4	23.8	1.4xSignificant	29 to 38.3	2019-2023
Bladder	New cases	25	18.7	1.34xSignificant	21.4 to 29	2019-2023
Brain & nervous system	Deaths	5.8	4.4	1.32x	4.1 to 8.1	2020-2024
Brain & nervous system	New cases	7.3	6.2	1.18x	5.4 to 9.9	2019-2023
Lung & bronchus	New cases	60.4	51.8	1.17xSignificant	54.9 to 66.4	2019-2023
All cancer	New cases	521.6	453.4	1.15xSignificant	504.2 to 539.5	2019-2023
Pancreas	New cases	15.5	13.9	1.12x	12.8 to 18.7	2019-2023
Non-Hodgkin lymphoma	New cases	20.4	18.5	1.1x	17.1 to 24.2	2019-2023
Kidney & renal pelvis	New cases	19.5	17.9	1.09x	16.2 to 23.3	2019-2023
Leukemia	Deaths	6.1	5.7	1.07x	4.4 to 8.4	2020-2024
Pancreas	Deaths	11.9	11.3	1.05x	9.5 to 14.7	2020-2024
Thyroid	New cases	13.5	13	1.04x	10.4 to 17.2	2019-2023
Kidney & renal pelvis	Deaths	3.5	3.4	1.03x	2.3 to 5.2	2020-2024
All cancer	Deaths	146.8	143.2	1.03x	137.9 to 156.1	2020-2024
Bladder	Deaths	4.2	4.1	1.02x	2.8 to 6.1	2020-2024
Non-Hodgkin lymphoma	Deaths	4.7	4.8	0.98x	3.3 to 6.6	2020-2024
Liver & bile duct	Deaths	6.3	6.6	0.95x	4.6 to 8.4	2020-2024
Liver & bile duct	New cases	8.3	8.7	0.95x	6.3 to 10.8	2019-2023
Lung & bronchus	Deaths	28.6	30.2	0.95x	24.8 to 32.8	2020-2024
Stomach	New cases	6.2	6.6	0.94x	4.5 to 8.5	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 Walworth County
Measure	County	U.S. median	Difference	Unit
Premature death	7,248.4	9,842.6	-26%	years of life lost before age 75 per 100,000
Life expectancy	78	75.3	+4%	years
Child mortality	39.7	59.8	-34%	deaths under age 18 per 100,000
Infant mortality	4.7	6.2	-25%	deaths under age 1 per 1,000 live births
Injury deaths	85.9	96.9	-11%	deaths per 100,000
Drug overdose deaths	22.1	28.6	-23%	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.

Formaldehyde14.33 per million
Carbon Tetrachloride2.96 per million
Acetaldehyde1.34 per million
Naphthalene1.09 per million

EPA Air Quality Index 2025

Monitored on 199 days: 158 good, 3 unhealthy for sensitive groups or worse. Median AQI 42, peak 112.

Regulated facilities, sites and hazards by type

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

NPDES wastewater discharge permit173
Rail grade crossing103
Gas station (mapped facility)51
Toxic chemical release facility (TRI)24
TRI reporting facility22
Brownfield property21
Small hazardous waste generator20
Public airport17
Auto repair or body shop (mapped facility)17
Hazardous waste transporter8
Major air pollution source4
Air permit holder (minor source)4
Large hazardous waste generator4
Heliport3
Industrial wastewater discharge3
Dry cleaner (mapped facility)2
Landfill (mapped facility)2
Wastewater plant (mapped facility)2
EPA air quality monitor1
Large greenhouse gas emitter1
Scrapyard (mapped facility)1
Superfund (NPL) site1

Highest-severity records

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

Delavan Municipal Well #4, Delavan
Superfund (NPL) site. Hazard Ranking System score 28.9. NPL Site.
EPA site ID WID980820062 (U.S. EPA Superfund (SEMS/NPL)) Agency record
Severity 10
Generac Power Systems, Whitewater
TRI reporting facility.
EPA FRS registry ID 110012603986 (U.S. EPA ECHO) Agency record
Severity 8
Plymouth Tube Trent Plant, East Troy
Toxic chemical release facility (TRI). Chemicals: Nitric acid, Hydrogen fluoride, Chromium, Nickel and 2 more. Reports carcinogens. 30,051 lbs released over 5 years.
TRI facility ID 53120PLYMT256YU (U.S. EPA Toxics Release Inventory)
Severity 7.9
Getzen Co Inc., Elkhorn
Toxic chemical release facility (TRI). Chemicals: Tetrachloroethylene, Lead. Reports carcinogens. 16,902 lbs released over 5 years.
TRI facility ID 53121GTZNC530SH (U.S. EPA Toxics Release Inventory)
Severity 7.7
Hudapack Metal Treating Inc, Elkhorn
Toxic chemical release facility (TRI). Chemicals: Methanol, Ammonia. 17,804 lbs released over 5 years.
TRI facility ID 53121HDPCK979KO (U.S. EPA Toxics Release Inventory)
Severity 6.3
Conagra Foods Packaged Foods Llc, Darien
Toxic chemical release facility (TRI). Chemicals: Ammonia, Nitric acid. 17,192 lbs released over 5 years.
TRI facility ID 53114THLRSPOBOX (U.S. EPA Toxics Release Inventory)
Severity 6.3
Wisconsin Precision Casting Corp, Lake Geneva
Toxic chemical release facility (TRI). Chemicals: Chromium, Nickel, Manganese, 4,4'-Isopropylidenediphenol and 1 more. Reports carcinogens. 146 lbs released over 5 years.
TRI facility ID 53147NRTHRHWY36 (U.S. EPA Toxics Release Inventory)
Severity 6.2
Generac Power Systems Inc-Whitewater, Whitewater
Toxic chemical release facility (TRI). Chemicals: Methyl methacrylate, Manganese, Copper, Propylene and 1 more. 9,773 lbs released over 5 years.
TRI facility ID 53190GNRCP757NN (U.S. EPA Toxics Release Inventory)
Severity 6.1
Wisconsin Precision Casting Corp, East Troy
Toxic chemical release facility (TRI). Chemicals: Chromium, Nickel, Manganese, Copper and 1 more. Reports carcinogens. 97 lbs released over 5 years.
TRI facility ID 53120WSCNS405HW (U.S. EPA Toxics Release Inventory)
Severity 6
Generac Power Systems, Whitewater
Major air pollution source.
EPA FRS registry ID 110012603986 (U.S. EPA ECHO) Agency record
Severity 6
Arntzen Corp, Sharon
Toxic chemical release facility (TRI). Chemicals: Manganese, Copper, Chromium, Nickel. Reports carcinogens. 65 lbs released over 5 years.
TRI facility ID 5358WRNTZN458WE (U.S. EPA Toxics Release Inventory)
Severity 5.9
Applied Material Solutions Inc, Elkhorn
Toxic chemical release facility (TRI). Chemicals: Formaldehyde. Reports carcinogens. 45 lbs released over 5 years.
TRI facility ID 53121SNPND1001E (U.S. EPA Toxics Release Inventory)
Severity 5.8
Plymouth Tube Company, East Troy
TRI reporting facility.
EPA FRS registry ID 110069727102 (U.S. EPA ECHO) Agency record
Severity 5.8
Hudapack Metal Treating Inc, Elkhorn
TRI reporting facility.
EPA FRS registry ID 110000417308 (U.S. EPA ECHO) Agency record
Severity 5.6
Walworth County Metro, Delavan
NPDES wastewater discharge permit.
EPA FRS registry ID 110000762443 (U.S. EPA ECHO) Agency record
Severity 5.5
Generac Power Systems, Whitewater
NPDES wastewater discharge permit.
EPA FRS registry ID 110012603986 (U.S. EPA ECHO) Agency record
Severity 5.5
Hexpol - Whitewater, Whitewater
Toxic chemical release facility (TRI). Chemicals: Certain glycol ethers, Zinc compounds, Di(2-ethylhexyl) phthalate. Reports carcinogens. 19 lbs released over 5 years.
TRI facility ID 53190TRSTL736EX (U.S. EPA Toxics Release Inventory)
Severity 5.5
Brunk Industries Inc., Lake Geneva
Toxic chemical release facility (TRI). Chemicals: Nickel, Chromium, Manganese, Copper. Reports carcinogens. 17 lbs released over 5 years.
TRI facility ID 53147BRNKN1225S (U.S. EPA Toxics Release Inventory)
Severity 5.5
Usg Interiors Llc, Walworth
Toxic chemical release facility (TRI). Chemicals: Hydrogen sulfide, Carbonyl sulfide. 1,227 lbs released over 5 years.
TRI facility ID 53184SGNTR208AD (U.S. EPA Toxics Release Inventory)
Severity 5.4
Usg Interiors Llc, Walworth
TRI reporting facility.
EPA FRS registry ID 110000417923 (U.S. EPA ECHO) Agency record
Severity 5.3
Birds Eye Foods Llc, Darien
TRI reporting facility.
EPA FRS registry ID 110000727330 (U.S. EPA ECHO) Agency record
Severity 5.3
Spx Flow Us Llc, Delavan
Toxic chemical release facility (TRI). Chemicals: Chromium, Nickel, Diisocyanates. Reports carcinogens. 11 lbs released over 5 years.
TRI facility ID 53115WKSHF611SU (U.S. EPA Toxics Release Inventory)
Severity 5.3
Fontana-Walworth Water Pollution Control Commission, Fontana
NPDES wastewater discharge permit.
EPA FRS registry ID 110002051528 (U.S. EPA ECHO) Agency record
Severity 5.3
Spx Flow Us Llc, Delavan
Toxic chemical release facility (TRI). Chemicals: Chromium, Nickel. Reports carcinogens. 4 lbs released over 5 years.
TRI facility ID 5311WSPXFL1714H (U.S. EPA Toxics Release Inventory)
Severity 5
R&L Spring Co, Lake Geneva
Toxic chemical release facility (TRI). Chemicals: Chromium, Nickel, Manganese, Lead. Reports carcinogens. 2 lbs released over 5 years.
TRI facility ID 53147RLSPR197GE (U.S. EPA Toxics Release Inventory)
Severity 4.9

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 Walworth County

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