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Healthcare
9 min read
Areas of Expertise :
Environmental Engineering, Toxicology, Air Quality, Toxic Exposure, Environmental Science
Published Date:
Last Modified Date:
Jurisdiction:
Illinois State
In Kamuda v. Sterigenics U.S., LLC, et al. (No. 2018-L-010475, Cir. Ct. Cook County), a Cook County jury found Sterigenics, Sotera Health, and Griffith Foods liable on September 19, 2022, on claims arising from alleged injuries linked to long-term ethylene oxide (EtO) emissions from the Willowbrook, Illinois sterilization facility. The jury returned a $363 million verdict, including $38 million in compensatory damages and $325 million in punitive damages, on claims that included negligence, civil battery, and public nuisance. In December 2022, the trial court denied the defendants’ post-trial motions, leaving the verdict in place as the case moved toward appeal. Sotera Health, the parent company of Sterigenics, later announced a settlement framework of approximately $408 million in January 2023 to resolve more than 870 related Illinois EtO cases. The settlement was initially subject to plaintiff participation, court good-faith settlement review, funding, and dismissal requirements. In June 2023, Sotera Health announced that the opt-in process was complete, that 99.7% of eligible claimants had agreed to participate, and that Sterigenics had elected to proceed with the settlements.
Scientific and regulatory materials appeared throughout the litigation record. Federal and state agencies examined air-toxics risk near the Willowbrook site, including ATSDR’s 2018 Letter Health Consultation on potential health effects associated with EtO emissions and EPA’s 2019 facility-specific risk assessment for the Sterigenics facility. Air-monitoring data, facility-level dispersion modeling, and national-scale screening materials also contributed to the broader atmospheric-science record. EPA’s AirToxScreen served as a national screening tool for identifying potential air-toxics hot spots requiring further study, rather than as site-specific proof for the Willowbrook facility, while EPA’s 2016 Integrated Risk Information System carcinogenicity assessment supplied additional regulatory risk context. Together, these agency materials, the allegations in the complaint, and the jury’s findings formed the exposure and risk framework disputed at trial and later considered in the broader settlement context.
In 2018, the Agency for Toxic Substances and Disease Registry (ATSDR) issued its Evaluation of Potential Health Impacts from Ethylene Oxide Emissions for the Willowbrook facility. ATSDR found that, if measured and modeled EtO concentrations reflected long-term conditions, some nearby residents and workers could face elevated cancer-risk estimates from long-term exposure. The report became part of the public and regulatory record and supplied scientific and regulatory background for later claims involving air dispersion, community exposure, and health-risk assessment.
EPA’s Risk Assessment Report for the Sterigenics Willowbrook facility documented the agency’s facility-specific process for estimating risk from EtO emissions. The report provided regulatory background for evaluating potential long-term cancer-risk estimates near the site. EPA and ATSDR materials also referenced air-dispersion and risk-assessment methods used to estimate potential community exposure and evaluate how EtO emissions may have moved through surrounding areas.
After the Illinois EPA issued a February 15, 2019 Seal Order, the Willowbrook facility did not resume operations. A September 6, 2019 Consent Order would have allowed operations to resume under stricter emission controls, but Sterigenics announced on September 30, 2019 that it would discontinue operations at the Willowbrook site. The closure became part of the litigation timeline and Illinois’ broader response to ethylene oxide emissions from industrial facilities.
In March 2022, EPA released the first AirToxScreen results for the 2017 cycle, replacing the National Air Toxics Assessment (NATA) as the agency’s national-scale air-toxics screening tool. AirToxScreen provides national, screening-level risk estimates for inhalation exposure to air pollutants and helps identify potential hot spots for further study and regulatory review. It does not serve as site-specific evidence or dispersion modeling for any individual facility. The results provided a broader screening background for regulatory analyses involving ethylene oxide (EtO) emissions and community-level risk assessment.
A Cook County jury found Sterigenics, Sotera Health, and Griffith Foods liable for negligence, civil battery, and public nuisance in Kamuda v. Sterigenics U.S., LLC (Case No. 2018-L-010475). The jury awarded $38 million in compensatory damages and $325 million in punitive damages, marking the first verdict among hundreds of related cases. Trial evidence addressed air dispersion, exposure duration, EtO toxicity, cancer-causation issues, and facility-related emissions history. Publicly reported expert testimony and technical evidence helped explain exposure assessment, atmospheric movement, toxicology, and the disputed link between long-term EtO exposure and the plaintiff’s alleged injury.
Cook County Judge Marguerite Quinn denied post-trial motions by Sterigenics and Sotera Health, leaving the $363 million jury verdict in place before appeal. The ruling allowed the judgment to stand while post-trial interest continued to accrue. The decision also became part of the litigation posture as related Willowbrook EtO cases continued toward broader resolution discussions.
In January 2023, Sotera Health, the parent company of Sterigenics, announced agreements to pay approximately $408 million to resolve more than 870 Illinois lawsuits involving EtO emissions from the Willowbrook facility. The agreements were subject to plaintiff opt-ins, funding, court review, and dismissal requirements. In June 2023, Sotera Health announced that the opt-in process was complete, that 99.7% of eligible claimants had agreed to participate, and that Sterigenics had elected to proceed with the settlements. While denying wrongdoing, the company cited the cost, length, and uncertainty of continued litigation as reasons for pursuing a negotiated resolution.
Court:
Circuit Court of Cook County, Illinois, County Department, Law Division
Case Name:
In re: Willowbrook Ethylene Oxide Litigation
Air Pollution
Atmospheric dispersion modeling
Atmospheric Sciences
Chemical Exposures
Environmental Toxicology
Exposure Assessments
Risk Assessment
In Kamuda v. Sterigenics U.S., LLC, et al. (No. 2018-L-010475, Cir. Ct. Cook County), a Cook County jury found Sterigenics, Sotera Health, and Griffith Foods liable on September 19, 2022, on claims arising from alleged injuries linked to long-term ethylene oxide (EtO) emissions from the Willowbrook, Illinois sterilization facility. The jury returned a $363 million verdict, including $38 million in compensatory damages and $325 million in punitive damages, on claims that included negligence, civil battery, and public nuisance. In December 2022, the trial court denied the defendants’ post-trial motions, leaving the verdict in place as the case moved toward appeal. Sotera Health, the parent company of Sterigenics, later announced a settlement framework of approximately $408 million in January 2023 to resolve more than 870 related Illinois EtO cases. The settlement was initially subject to plaintiff participation, court good-faith settlement review, funding, and dismissal requirements. In June 2023, Sotera Health announced that the opt-in process was complete, that 99.7% of eligible claimants had agreed to participate, and that Sterigenics had elected to proceed with the settlements.
Scientific and regulatory materials appeared throughout the litigation record. Federal and state agencies examined air-toxics risk near the Willowbrook site, including ATSDR’s 2018 Letter Health Consultation on potential health effects associated with EtO emissions and EPA’s 2019 facility-specific risk assessment for the Sterigenics facility. Air-monitoring data, facility-level dispersion modeling, and national-scale screening materials also contributed to the broader atmospheric-science record. EPA’s AirToxScreen served as a national screening tool for identifying potential air-toxics hot spots requiring further study, rather than as site-specific proof for the Willowbrook facility, while EPA’s 2016 Integrated Risk Information System carcinogenicity assessment supplied additional regulatory risk context. Together, these agency materials, the allegations in the complaint, and the jury’s findings formed the exposure and risk framework disputed at trial and later considered in the broader settlement context.
In 2018, the Agency for Toxic Substances and Disease Registry (ATSDR) issued its Evaluation of Potential Health Impacts from Ethylene Oxide Emissions for the Willowbrook facility. ATSDR found that, if measured and modeled EtO concentrations reflected long-term conditions, some nearby residents and workers could face elevated cancer-risk estimates from long-term exposure. The report became part of the public and regulatory record and supplied scientific and regulatory background for later claims involving air dispersion, community exposure, and health-risk assessment.
EPA’s Risk Assessment Report for the Sterigenics Willowbrook facility documented the agency’s facility-specific process for estimating risk from EtO emissions. The report provided regulatory background for evaluating potential long-term cancer-risk estimates near the site. EPA and ATSDR materials also referenced air-dispersion and risk-assessment methods used to estimate potential community exposure and evaluate how EtO emissions may have moved through surrounding areas.
After the Illinois EPA issued a February 15, 2019 Seal Order, the Willowbrook facility did not resume operations. A September 6, 2019 Consent Order would have allowed operations to resume under stricter emission controls, but Sterigenics announced on September 30, 2019 that it would discontinue operations at the Willowbrook site. The closure became part of the litigation timeline and Illinois’ broader response to ethylene oxide emissions from industrial facilities.
In March 2022, EPA released the first AirToxScreen results for the 2017 cycle, replacing the National Air Toxics Assessment (NATA) as the agency’s national-scale air-toxics screening tool. AirToxScreen provides national, screening-level risk estimates for inhalation exposure to air pollutants and helps identify potential hot spots for further study and regulatory review. It does not serve as site-specific evidence or dispersion modeling for any individual facility. The results provided a broader screening background for regulatory analyses involving ethylene oxide (EtO) emissions and community-level risk assessment.
A Cook County jury found Sterigenics, Sotera Health, and Griffith Foods liable for negligence, civil battery, and public nuisance in Kamuda v. Sterigenics U.S., LLC (Case No. 2018-L-010475). The jury awarded $38 million in compensatory damages and $325 million in punitive damages, marking the first verdict among hundreds of related cases. Trial evidence addressed air dispersion, exposure duration, EtO toxicity, cancer-causation issues, and facility-related emissions history. Publicly reported expert testimony and technical evidence helped explain exposure assessment, atmospheric movement, toxicology, and the disputed link between long-term EtO exposure and the plaintiff’s alleged injury.
Cook County Judge Marguerite Quinn denied post-trial motions by Sterigenics and Sotera Health, leaving the $363 million jury verdict in place before appeal. The ruling allowed the judgment to stand while post-trial interest continued to accrue. The decision also became part of the litigation posture as related Willowbrook EtO cases continued toward broader resolution discussions.
In January 2023, Sotera Health, the parent company of Sterigenics, announced agreements to pay approximately $408 million to resolve more than 870 Illinois lawsuits involving EtO emissions from the Willowbrook facility. The agreements were subject to plaintiff opt-ins, funding, court review, and dismissal requirements. In June 2023, Sotera Health announced that the opt-in process was complete, that 99.7% of eligible claimants had agreed to participate, and that Sterigenics had elected to proceed with the settlements. While denying wrongdoing, the company cited the cost, length, and uncertainty of continued litigation as reasons for pursuing a negotiated resolution.
1. Exposure Assessment Expert Witnesses (Plaintiff)
In the related Fornek trial, plaintiff-side expert witnesses calculated EtO exposure levels that were presented to the jury. The jury heard evidence that those calculated levels were only slightly above background EtO levels in the plaintiff’s area. This evidence addressed exposure assessment, background EtO, and the difference between alleged facility-related exposure and naturally occurring EtO.
2. Atmospheric Sciences Expert Witnesses
Atmospheric sciences expert witnesses are often engaged in air-toxics cases involving the movement of emissions through outdoor air. Their work may include meteorology, wind patterns, air-dispersion modeling, emissions inputs, and estimated concentrations in surrounding communities. In EtO litigation, this analysis can evaluate how emissions may have traveled from a sterilization facility into nearby residential or workplace areas.
3. Environmental Engineering Expert Witnesses
Environmental engineering expert witnesses are often engaged in industrial-emissions disputes involving equipment, control systems, monitoring practices, and facility operations. In EtO sterilization cases, they may evaluate sterilization chambers, aeration areas, stack emissions, fugitive releases, and emission-control measures. Their work can address whether emissions were measured, controlled, and reported under applicable air-quality requirements.
4. Toxicology Expert Witnesses
Toxicology expert witnesses are often engaged in toxic-exposure cases involving dose, exposure duration, risk characterization, and alleged health effects. In EtO litigation, they may evaluate dose-response principles, regulatory risk assessments, exposure estimates, and the scientific basis for claimed injuries. Their analysis can also distinguish population-level risk estimates from opinions about an individual claimant’s alleged injury.
1. Using Atmospheric Science in Causation Arguments
Attorneys in Kamuda v. Sterigenics used emissions history, air-quality materials, and atmospheric data to explain alleged community exposure and support causation arguments. The litigation relied on ATSDR findings and EPA’s facility-specific risk assessment, while treating EPA’s AirToxScreen as national-scale screening context rather than site-specific proof. The record shows how atmospheric science can be presented in clear terms for jurors in toxic-tort litigation.
2. Using Regulatory Findings as Evidence Anchors
EPA and ATSDR materials gave attorneys a science-based foundation for discussing alleged environmental exposure. These materials helped organize the plaintiffs’ exposure theory and gave jurors context for public-health risk estimates. Agency analyses can support scientific evidence when attorneys clearly explain each source’s purpose and limits.
3. Connecting Negligence and Nuisance Claims to Long-Term Exposure Evidence
The plaintiffs’ legal team connected emissions history, facility operations, and alleged community risk to negligence and nuisance theories. By tying operational conduct to long-term exposure allegations, counsel presented a cumulative-risk theory grounded in environmental data and health-risk evidence. This approach can help courts and juries follow complex exposure timelines in air-quality litigation.
4. Presenting Technical Evidence in Air-Toxics Litigation
The proceedings involved technical issues commonly addressed by toxicology, environmental engineering, public health, atmospheric-science, and exposure-assessment experts in air-toxics litigation. Scientific evidence in this type of case may involve EtO dispersion, exposure estimates, dose-response principles, and disease-risk evidence. Clear organization of technical evidence can help jurors evaluate complex environmental claims without losing the limits of the underlying science.
5. Structuring Settlements After Major Verdicts
The $408 million settlement framework followed the $363 million jury verdict and affected broader resolution discussions in the Willowbrook EtO litigation. Counsel had to weigh appellate risk, litigation cost, claimant participation, and potential recovery while negotiating a path to resolve covered claims. The settlement framework provided a mechanism for resolving participating claims without an admission of liability.
The Sterigenics Willowbrook ethylene oxide (EtO) litigation moved toward broad resolution after Sotera Health announced a $408 million settlement framework in January 2023 covering more than 870 related Illinois cases, following the $363 million verdict in Kamuda v. Sterigenics. In June 2023, Sotera Health announced that the opt-in process was complete, that 99.7% of eligible claimants had agreed to participate, and that Sterigenics had elected to proceed with the settlements. The proceedings showed how environmental law and toxic-tort litigation can depend on scientific and regulatory evidence, including EPA and ATSDR materials addressing exposure and risk. The Willowbrook facility had not operated since the Illinois EPA’s February 15, 2019 seal order, and Sterigenics announced on September 30, 2019 that it would discontinue operations at the site. Scientific materials, technical analyses, and regulatory risk-assessment methods involving air-dispersion modeling, risk-screening tools, and toxicological evaluation helped explain complex atmospheric data in the litigation, while the settlement created a path to resolve participating claims without an admission of liability.
Why was ethylene oxide central to the Sterigenics Willowbrook litigation?
Ethylene oxide (EtO) was central because Sterigenics used the gas in sterilization operations at its Willowbrook, Illinois facility. Plaintiffs alleged that long-term EtO emissions from the facility created cancer-risk concerns for nearby residents based on agency modeling, monitoring data, and exposure assumptions.
What did the jury decide in the first Sterigenics trial?
In September 2022, a Cook County jury awarded $363 million to plaintiff Sue Kamuda after finding that Sterigenics’ EtO emissions caused her breast cancer. The verdict included $38 million in compensatory damages and $325 million in punitive damages.
How did atmospheric sciences fit into the litigation?
Atmospheric-science issues appeared through air-monitoring data, air-dispersion modeling, EPA facility-level risk assessment materials, and AirToxScreen’s national-scale screening context. These materials were used to evaluate how EtO emissions may have moved through nearby areas and how potential long-term exposure could be assessed.
When was the Sterigenics Willowbrook facility closed?
The Willowbrook facility had not operated since the Illinois EPA issued a Seal Order on February 15, 2019. Sterigenics later announced on September 30, 2019 that it would discontinue operations at the Willowbrook site after state enforcement actions and public concern over EtO risk estimates.
What agency materials provided context for the Willowbrook EtO claims?
ATSDR’s 2018 health consultation and EPA’s 2019 Willowbrook-specific risk assessment provided regulatory and public-health context for the exposure allegations. EPA’s AirToxScreen also provided national screening background, but it should be treated as a screening tool rather than site-specific proof for the Willowbrook facility.
1. Exposure Assessment Expert Witnesses (Plaintiff)
In the related Fornek trial, plaintiff-side expert witnesses calculated EtO exposure levels that were presented to the jury. The jury heard evidence that those calculated levels were only slightly above background EtO levels in the plaintiff’s area. This evidence addressed exposure assessment, background EtO, and the difference between alleged facility-related exposure and naturally occurring EtO.
2. Atmospheric Sciences Expert Witnesses
Atmospheric sciences expert witnesses are often engaged in air-toxics cases involving the movement of emissions through outdoor air. Their work may include meteorology, wind patterns, air-dispersion modeling, emissions inputs, and estimated concentrations in surrounding communities. In EtO litigation, this analysis can evaluate how emissions may have traveled from a sterilization facility into nearby residential or workplace areas.
3. Environmental Engineering Expert Witnesses
Environmental engineering expert witnesses are often engaged in industrial-emissions disputes involving equipment, control systems, monitoring practices, and facility operations. In EtO sterilization cases, they may evaluate sterilization chambers, aeration areas, stack emissions, fugitive releases, and emission-control measures. Their work can address whether emissions were measured, controlled, and reported under applicable air-quality requirements.
4. Toxicology Expert Witnesses
Toxicology expert witnesses are often engaged in toxic-exposure cases involving dose, exposure duration, risk characterization, and alleged health effects. In EtO litigation, they may evaluate dose-response principles, regulatory risk assessments, exposure estimates, and the scientific basis for claimed injuries. Their analysis can also distinguish population-level risk estimates from opinions about an individual claimant’s alleged injury.
1. Using Atmospheric Science in Causation Arguments
Attorneys in Kamuda v. Sterigenics used emissions history, air-quality materials, and atmospheric data to explain alleged community exposure and support causation arguments. The litigation relied on ATSDR findings and EPA’s facility-specific risk assessment, while treating EPA’s AirToxScreen as national-scale screening context rather than site-specific proof. The record shows how atmospheric science can be presented in clear terms for jurors in toxic-tort litigation.
2. Using Regulatory Findings as Evidence Anchors
EPA and ATSDR materials gave attorneys a science-based foundation for discussing alleged environmental exposure. These materials helped organize the plaintiffs’ exposure theory and gave jurors context for public-health risk estimates. Agency analyses can support scientific evidence when attorneys clearly explain each source’s purpose and limits.
3. Connecting Negligence and Nuisance Claims to Long-Term Exposure Evidence
The plaintiffs’ legal team connected emissions history, facility operations, and alleged community risk to negligence and nuisance theories. By tying operational conduct to long-term exposure allegations, counsel presented a cumulative-risk theory grounded in environmental data and health-risk evidence. This approach can help courts and juries follow complex exposure timelines in air-quality litigation.
4. Presenting Technical Evidence in Air-Toxics Litigation
The proceedings involved technical issues commonly addressed by toxicology, environmental engineering, public health, atmospheric-science, and exposure-assessment experts in air-toxics litigation. Scientific evidence in this type of case may involve EtO dispersion, exposure estimates, dose-response principles, and disease-risk evidence. Clear organization of technical evidence can help jurors evaluate complex environmental claims without losing the limits of the underlying science.
5. Structuring Settlements After Major Verdicts
The $408 million settlement framework followed the $363 million jury verdict and affected broader resolution discussions in the Willowbrook EtO litigation. Counsel had to weigh appellate risk, litigation cost, claimant participation, and potential recovery while negotiating a path to resolve covered claims. The settlement framework provided a mechanism for resolving participating claims without an admission of liability.
The Sterigenics Willowbrook ethylene oxide (EtO) litigation moved toward broad resolution after Sotera Health announced a $408 million settlement framework in January 2023 covering more than 870 related Illinois cases, following the $363 million verdict in Kamuda v. Sterigenics. In June 2023, Sotera Health announced that the opt-in process was complete, that 99.7% of eligible claimants had agreed to participate, and that Sterigenics had elected to proceed with the settlements. The proceedings showed how environmental law and toxic-tort litigation can depend on scientific and regulatory evidence, including EPA and ATSDR materials addressing exposure and risk. The Willowbrook facility had not operated since the Illinois EPA’s February 15, 2019 seal order, and Sterigenics announced on September 30, 2019 that it would discontinue operations at the site. Scientific materials, technical analyses, and regulatory risk-assessment methods involving air-dispersion modeling, risk-screening tools, and toxicological evaluation helped explain complex atmospheric data in the litigation, while the settlement created a path to resolve participating claims without an admission of liability.
Why was ethylene oxide central to the Sterigenics Willowbrook litigation?
Ethylene oxide (EtO) was central because Sterigenics used the gas in sterilization operations at its Willowbrook, Illinois facility. Plaintiffs alleged that long-term EtO emissions from the facility created cancer-risk concerns for nearby residents based on agency modeling, monitoring data, and exposure assumptions.
What did the jury decide in the first Sterigenics trial?
In September 2022, a Cook County jury awarded $363 million to plaintiff Sue Kamuda after finding that Sterigenics’ EtO emissions caused her breast cancer. The verdict included $38 million in compensatory damages and $325 million in punitive damages.
How did atmospheric sciences fit into the litigation?
Atmospheric-science issues appeared through air-monitoring data, air-dispersion modeling, EPA facility-level risk assessment materials, and AirToxScreen’s national-scale screening context. These materials were used to evaluate how EtO emissions may have moved through nearby areas and how potential long-term exposure could be assessed.
When was the Sterigenics Willowbrook facility closed?
The Willowbrook facility had not operated since the Illinois EPA issued a Seal Order on February 15, 2019. Sterigenics later announced on September 30, 2019 that it would discontinue operations at the Willowbrook site after state enforcement actions and public concern over EtO risk estimates.
What agency materials provided context for the Willowbrook EtO claims?
ATSDR’s 2018 health consultation and EPA’s 2019 Willowbrook-specific risk assessment provided regulatory and public-health context for the exposure allegations. EPA’s AirToxScreen also provided national screening background, but it should be treated as a screening tool rather than site-specific proof for the Willowbrook facility.
Air Pollution
Atmospheric dispersion modeling
Atmospheric Sciences
Chemical Exposures
Environmental Toxicology
Exposure Assessments
Risk Assessment
Medical Devices, +4
Healthcare
Healthcare, +4
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