United States Environmental Protection Agency

The EPA was created in response to growing public concern over environmental degradation, exemplified by events like the 1969 Cuyahoga River fire and the Santa Barbara oil spill. President Nixon's Reorganization Plan No. 3 of 1970 merged 15 components from five departments and agencies, including the Department of the Interior and the Department of Health, Education, and Welfare, into a single agency with a unified mission.¹ The agency's first administrator, William Ruckelshaus, set a precedent for aggressive enforcement, filing 180 pollution abatement actions in his first year. The EPA's authority derives from major environmental laws, including the Clean Air Act, the Clean Water Act, and the Comprehensive Environmental Response, Compensation, and Liability Act (Superfund), which Congress passed in the 1970s and 1980s.²

The EPA is headquartered in Washington, D.C., and operates 10 regional offices, each responsible for implementing federal environmental programs within its jurisdiction. The agency is led by an Administrator, appointed by the President and confirmed by the Senate, who reports directly to the President. The EPA's work is organized into program offices, such as the Office of Air and Radiation, the Office of Water, and the Office of Chemical Safety and Pollution Prevention, which develop regulations and conduct scientific research. The agency employs scientists, engineers, lawyers, and policy analysts, and it funds research at universities through its Science to Achieve Results (STAR) program. The EPA also oversees the Environmental Justice program, which addresses disproportionate environmental burdens on minority and low-income communities.

The EPA's regulatory actions have led to significant environmental improvements. For example, the phase-out of leaded gasoline, mandated under the Clean Air Act, reduced average blood lead levels in Americans by more than 90% between 1976 and 2002.³ The agency's enforcement of the Clean Water Act has helped restore many waterways, though challenges remain, such as nutrient pollution and emerging contaminants like PFAS. The EPA also administers the Superfund program, which has cleaned up thousands of hazardous waste sites since 1980.⁴ More recently, the EPA has addressed climate change through regulations like the Clean Power Plan (later repealed) and the 2022 methane rules, reflecting shifting political priorities.⁵

Beyond its well-known duties, the EPA has several lesser-known functions. Its Environmental Technology Verification program independently verifies the performance of innovative environmental technologies, aiding market adoption. The agency's National Environmental Publications Information System (NEPIS) provides free online access to historical environmental documents, some dating back to the 1970s. The EPA also operates the Environmental Response Team, a specialized unit that responds to chemical spills and other emergencies. A notable historical quirk: the EPA's original seal featured a stylized flower, but it was replaced in the 1970s with the current logo depicting a blue globe with green leaves. The agency has also been involved in international efforts, such as the Montreal Protocol, which it helped implement to protect the ozone layer.

Clean Air Act

U.S. federal law regulating air emissions from stationary and mobile sources, first enacted in 1963 and amended in 1970 and 1990.

Clean Water Act

U.S. federal law governing water pollution, originally enacted in 1972 as the Federal Water Pollution Control Act.

Superfund

Common name for the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), a 1980 law that funds cleanup of hazardous waste sites.

PFAS

Per- and polyfluoroalkyl substances, a group of synthetic chemicals used in many products that are persistent in the environment and linked to health risks.