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Environmental Enforcement Section

Marvin Gaye Park / Watts Branch
Photo by ENRD
Hero Grand Canyon North Rim, Photo by Mae Bowen, ENRD
Photo by ENRD
Hero Smoke Stack Air Pollution, Courtesy of USGS
Photo by USGS
Hero Asgard Pass Washington State, Photo by Zach Moor, ENRD
Photo by ENRD

About the Section

The Environmental Enforcement Section (EES) is the largest litigating section in the Division. The Section is responsible for bringing civil judicial actions under most federal laws enacted to protect public health and the environment from the adverse effects of pollution, such as the Clean Air Act, Clean Water Act, Safe Drinking Water Act, Oil Pollution Act, Resource Conservation and Recovery Act (RCRA), and Superfund law (i.e., the Comprehensive Environmental Response, Compensation, and Liability Act, or CERCLA).

The Section's practice is broad and challenging. It includes cases of national scope, such as cases against multiple members of an identified industry, to obtain broad compliance with federal environmental laws. While the size of and outcomes in EES cases vary from year to year, in a typical year the Section secures injunctive relief valued in the billions of dollars and money judgments totaling hundreds of millions of dollars.

Meet the Section Chief


Thomas A. Mariani
Section Chief

Email the Division

Environment and Natural Resources Division seal
What We Do
  • Protect public health and the environment from the adverse effects of pollution to air, water, and land through civil judicial enforcement of the nation’s environmental laws.
  • Hold responsible parties accountable for the costs of cleaning up hazardous waste sites and restoring damaged natural resources.
  • Reduce harm to public health and the environment in overburdened and underserved communities.
  • Pursue federal law violations to reduce greenhouse gas emissions.
By the Numbers
Active Cases and Matters
Primary Client Agency
Pollution Control and Cleanup Secured Annually
Judgments Secured Annually