Sotera Health Co

From time to time, we may be subject to various legal proceedings arising in the ordinary course of our business, including claims relating to personal injury, property damage, workers’ compensation, employee safety, corporate governance and our disclosures as a Nasdaq-listed, publicly traded company. In addition, from time to time, we receive communications from government or regulatory agencies concerning investigations or allegations of noncompliance with laws or regulations in jurisdictions in which we operate. At this time, and except as is noted herein, we are unable to predict the outcome of, and cannot reasonably estimate the impact of, any pending litigation matters, matters concerning allegations of non-compliance with laws or regulations and matters concerning other allegations of other improprieties, or the incidence of any such matters in the future. Information regarding our material legal proceedings is included below.

Legal Proceedings Described in Note 14 “Commitments and Contingencies” of Our Consolidated Financial Statements

Note 14, “Commitments and Contingencies” to our consolidated financial statements for the three and six months ended June 30, 2024 contained in this Quarterly Report on Form 10-Q includes information on legal proceedings that constitute material contingencies for financial reporting purposes that could have a material effect on our financial condition or results of operations. This item should be read in conjunction with Note 14 “Commitments and Contingencies” for information regarding the following legal proceedings, which information is incorporated into this item by reference:

•Ethylene Oxide Tort Litigation – Illinois, Georgia, California and New Mexico;

•Insurance Coverage for Environmental Liabilities; and

•Sotera Health Company Securities Litigation and Related Matters.

Legal Proceedings That Are Not Described in Note 14 “Commitments and Contingencies” to Our Consolidated Financial Statements

In addition to the matters that are identified in Note 14 “Commitments and Contingencies” to our consolidated financial statements for the three and six months ended June 30, 2024 contained in this Quarterly Report on Form 10-Q, and incorporated into this item by reference, the following matters also constitute material pending legal proceedings, other than ordinary course litigation incidental to our business, to which we are or any of our subsidiaries is a party. SEC regulations require disclosure of environmental proceedings that involve a government authority and potential monetary sanctions that the Company reasonably believes will exceed a specified threshold. Effective January 1, 2024, except for the previously disclosed Notices of Violation issued to Sterigenics’ facilities in Queensbury, New York, Los Angeles, California and Ontario, California, the Company uses a threshold of $1.0 million to determine whether the disclosure of any such proceedings is required because we believe matters under this threshold are not material to the Company.

Notice of Violation at Queensbury, New York Ethylene Oxide Sterilization Facility

In May 2023, Sterigenics received a Notice of Violation (“NOV”) from the New York State Department of Environmental Conservation (“DEC”) relating to a May 2023 power outage at Sterigenics’ Queensbury, New York facility that resulted in a failure to restart the facility’s scrubber system. On June 10, 2024, Sterigenics and DEC entered into an Administrative Order on Consent pursuant to which Sterigenics agreed to implement additional remedial measures and pay a civil penalty, none of which resulted in a material expense.

Notices of Violation at Vernon and Ontario, California Ethylene Oxide Sterilization Facilities

In 2022, the South Coast Air Quality Management District (“SCAQMD”) in Southern California initiated an investigation into EO sterilization facilities located in the SCAQMD region, including Sterigenics’ facilities in Vernon and Ontario, California. In connection with this investigation, SCAQMD issued NOVs to the Vernon and Ontario facilities alleging violations of SCAQMD operational, maintenance, permitting and reporting requirements and that levels of ambient EO detected by SCAQMD during 2022 caused a public nuisance for off-site workers around the facilities in violation of general prohibitions on emissions. Sterigenics disputes the allegations and expects to be able to resolve the NOVs for an immaterial amount.