On June 18, 2026, Illinois Attorney General (AG) Kwame Raoul announced a lawsuit against Koppers Inc. and Koppers Carbon Materials LLC (collectively, Koppers) over alleged continued environmental pollution and human health violations stemming from Koppers’ chemical manufacturing facility in Stickney, IL.

The Lawsuit

The Koppers facility in Stickney is located in an area of environmental justice concern, which means that the surrounding area has more than twice the state average of low-income or immigrant households. The facility produces chemical products, including creosotes, coal tar pitches, naphthalene, and phthalic anhydride by converting tar waste from steel production and petroleum refining.

The AG’s lawsuit, filed in Cook County Circuit Court, alleges that Koppers violated state and federal environmental statutes and regulations on multiple occasions by allegedly failing to properly operate pollution control equipment and conduct required testing and monitoring, which allegedly caused excess air pollutants, including volatile organic materials, to be emitted into the atmosphere. The lawsuit alleges violations of the Illinois Environmental Protection Act, the Illinois Pollution Control Board’s air pollution regulations, federal environmental regulations, and construction and operating permits.

The lawsuit was filed based on a referral from the Illinois EPA, which has characterized Koppers as having a history of violating permit conditions and environmental regulations. Koppers has not publicly responded to the allegations.

AG Enforcement Authority

The Illinois Environmental Enforcement Division of the AG’s office prosecutes civil actions in circuit court and before the Illinois Pollution Control Board against individuals and entities that violate environmental laws — such as causing air, land, or water pollution, mishandling hazardous waste, or failing to obtain required permits — based on referrals from agencies like the Illinois EPA, the Department of Natural Resources, and the State Fire Marshal. The Division’s goals are to compel violators to clean up contamination, cease ongoing violations, pay monetary penalties, and undertake supplemental environmental projects, while also retaining independent authority to pursue enforcement actions on behalf of the people of the state of Illinois based on tips from residents, media reports, or its own investigations.

Why It Matters

The Koppers lawsuit illustrates one of the traditional enforcement responsibilities of the AG to protect the land, health, and safety within the jurisdictional boundaries. Here, the AG’s enforcement authority is augmented by the fact that the environmental and health effects are alleged to have occurred (or are occurring) in immigrant and impoverished communities bearing a disproportionate share of environmental burdens. Whether or not the allegations are ultimately proven, companies with air emission obligations should be aware of a few key takeaways.

• Self-reported deviation and compliance reports are not merely administrative and can potentially form part of the evidentiary record in an enforcement action.
• Alleged failures to properly operate pollution control equipment are treated seriously by regulators, particularly when claimed to recur.
• Facilities in areas designated as environmental justice concerns may attract heightened regulatory scrutiny.

Companies should conduct regular internal reviews of their compliance programs and take proactive corrective action when deviations occur. Documenting such compliance efforts provides a useful mitigation tool and defense should the company’s practices come under scrutiny by state or federal regulators.

Troutman Pepper Locke State Attorneys General Team

	Ashley Taylor – Co-leader and Firm Vice Chair Ashley is co-leader of the firm’s nationally ranked State Attorneys General practice, vice chair of the firm, and a partner in its Regulatory Investigations, Strategy + Enforcement (RISE) Practice Group. He helps his clients navigate the complexities involved with multistate attorneys general investigations and enforcement actions, federal agency actions, and accompanying litigation.
	Clay Friedman – Co-leader Clay co-leads the firm’s State Attorneys General practice and is nationally ranked by Chambers USA for AG Government Relations and in Best Lawyers for Advertising Law. He has dedicated his entire career to state attorney general and federal work, serving for nearly a decade in a senior role and more than 25+ years in private practice. Clay focuses his practice on helping industry-leading companies mitigate the risks associated with state and federal regulatory investigations and associated litigation.
	Chris Carlson Chris advises clients on regulatory, civil, and criminal investigations and litigation. With a background as an assistant attorney general, he provides practical guidance to clients with matters involving state attorneys general and federal regulatory agencies.
	Lauren Fincher Lauren has vast experience handling state attorneys general investigations, navigating complex regulatory compliance matters, and providing strategic counsel in enforcement actions across various industries. She helps clients manage high-stakes regulatory matters and guides them through complex legal landscapes.
	Stephen Piepgrass Stephen leads the firm’s Regulatory Investigations, Strategy + Enforcement (RISE) Practice Group, representing clients in single and multistate enforcement actions, including inquiries and investigations, as well as litigation involving state attorneys general and other state and federal governmental enforcement bodies. He has significant experience handling actions with federal agencies, including the CFPB and FTC, as well as single plaintiff and class action litigation for clients in highly regulated sectors such as financial services, health care, pharmaceutical, and education.
	Michael Yaghi Mike handles high-profile state attorneys general, FTC, and CFPB investigations by advising clients through these complex government inquiries. He assists clients through the entire life cycle of investigations, from regulatory enforcement through formal litigation.
	Matthew J. Berns Drawing on his experience in senior leadership roles in the New Jersey Attorney General’s and Governor’s Offices and as a trial attorney for the U.S. Department of Justice, Matt provides an insider’s perspective when guiding clients through complex government investigations, litigation, and other actions.
	Samuel E. “Gene” Fishel Gene is a former regulator with two decades of experience who has overseen state privacy and cybersecurity regulation enforcement, led national, multistate attorneys general privacy investigations, and prosecuted computer crimes at the state and federal levels. He has served at the forefront of state attorney general and federal enforcement, and utilizes this experience to proficiently represent client interests.
	Jeff Johnson Jeff helps clients navigate complex regulatory and litigation challenges with local, state, and federal authorities. His clients benefit from his decade of broad litigation experience, understanding of emerging state and federal regulatory issues, and strong relationships with attorneys general across the U.S. In addition to handling cases from trial through state or federal appeals, Jeff serves as amicus counsel in advancing legal rules to support his clients’ vital interests.
	Jay Myers Jay assists clients in heavily regulated industries, including health care, energy, insurance, emerging industries, and data privacy. He provides both regulatory legal advice and government relations strategies. Jay’s past and current clients include Fortune 10 companies, startups, nonprofits, industry associations, and advocacy groups. Recognizing that state government matters are often complex and multifaceted, he utilizes regulatory guidance, government advocacy, or both in tandem to deliver tailored solutions for each client’s unique needs.
	Zoe Schloss Zoe represents clients in litigation and government investigations. As former deputy attorney general for the Delaware Department of Justice, she is an experienced litigator who understands the enforcement priorities that impact her clients. Zoe works with individuals and corporate entities in highly regulated industries, including financial services, health care, and energy.
	Jessica Birdsong Jessica is an associate in the firm’s Regulatory Investigations, Strategy + Enforcement Practice Group. She received her J.D. from the University of Richmond School of Law, magna cum laude, where she served as associate articles editor of the Journal of Law & Technology.
	Sydney Goldberg Sydney is an associate in the firm’s Regulatory Investigations, Strategy + Enforcement (RISE) Practice Group. She has additional experience assisting with corporate transactions and finance matters.
	Troy Homesley Troy is an accomplished litigator who has represented and defended clients across a wide range of complex, high-stakes disputes at both the trial and appellate levels. He has represented technology companies, business executives, law firms, investment funds, high-ranking federal officials, international non-profits, and asylum seekers. Troy draws on his broad litigation experience to advise clients before litigation arises, while claims are pending or threatened, and leading up to and through trial and appeals.
	Namrata Kang Namrata (Nam) is an associate in the firm’s Regulatory Investigations, Strategy + Enforcement (RISE) Practice Group, based in the Washington, D.C. office. She routinely advises clients on a wide variety of state and federal regulatory matters, with a particular emphasis on state consumer protection laws relating to consumer financial services and marketing and advertising. Nam’s experience transcends multiple industries, including financial services, telecommunications, media, and sports betting.
	Michael Lafleur Michael is an associate in the firm’s Regulatory Investigations, Strategy, and Enforcement Practice Group. Based out of the firm’s Boston office, Mike has deep experience in litigation, investigations, and other regulatory matters involving state-level regulators and state attorneys general.
	William LaRosa Bill represents clients in complex regulatory investigations, state attorneys general matters, and enforcement proceedings, drawing on his experience as a former assistant U.S. attorney and private sector litigator in high stakes, multistate AG and regulatory matters.
	Philip Nickerson Philip represents clients in sectors such as financial, tech, real estate, and energy in a range of litigation matters. He is experienced in matters involving trade secrets, government investigations, commercial contracts, construction and product defect.
	Lane Page Lane specializes in federal and state regulatory investigations and complex civil litigation. He focuses on representing financial institutions and other businesses, with a particular emphasis on consumer protection and fair lending issues.
	Dascher Pasco Dascher is an attorney within the Regulatory Investigations, Strategy, and Enforcement practice, based in the Richmond office. She joined our firm after working in personal injury and medical malpractice for a Virginia trial law firm. Dascher brings varied legal experience to the firm with strong litigation and regulatory strategy capabilities.
	Kyara Rivera Rivera Kyara is an associate in the firm’s Regulatory Investigations, Strategy + Enforcement Practice Group. She received her J.D. from the University of Richmond School of Law, cum laude, where she served as publications and online editor of the Public Interest Law Review.
	Timothy Shyu Timothy is an associate in the firm’s Regulatory Investigations, Strategy + Enforcement Practice Group.
	Trey Smith Trey focuses his practice on representing and advising regulated utilities before state public utility commissions. He routinely helps clients obtain certificates of public convenience and necessity for transmission infrastructure. In this role, Trey works with his clients’ subject-matter experts to manage administrative proceedings, including by preparing initial filings; responding to discovery requests; drafting rebuttal testimony; and litigating any disputed issues.
	Daniel Waltz Dan helps clients navigate all aspects highly regulated relationships between industry participants and federal, state and local governments. Whether engaging with regulators, negotiating transactions or representing clients in the courtroom, he delivers solutions that help his clients achieve their strategic goals.
	Stephanie Kozol Stephanie is Troutman Pepper Locke’s senior government relations manager in the state attorneys general department.