Waters of the United States

Waters of the United States is a legal term of art used in the Clean Water Act and its implementing regulations to define the geographic scope of federal jurisdiction over surface waters. The precise definition determines which wetlands, streams, and other water bodies are protected from pollution or destruction under the authority of the United States Environmental Protection Agency and the United States Army Corps of Engineers. Its interpretation has been the subject of intense legal, political, and scientific debate for decades, directly influencing environmental protection, land use, and agricultural practices across the United States.

Definition and scope

The statutory term "navigable waters" in the Clean Water Act is defined as "the waters of the United States, including the territorial seas." Regulatory agencies have further defined WOTUS through rules to include traditional navigable waters like the Mississippi River and Great Lakes, interstate waters, territorial seas, and their tributaries. The scope has controversially expanded to encompass adjacent wetlands, as defined by criteria such as a "significant nexus" to downstream navigable waters, potentially including prairie potholes and ephemeral streams. This broad interpretation aims to protect the chemical, physical, and biological integrity of the nation's core waters by safeguarding contributing systems, a principle supported by many in the environmental movement but contested by entities like the American Farm Bureau Federation.

Regulatory history

Following the passage of the Clean Water Act in 1972, the United States Army Corps of Engineers and the United States Environmental Protection Agency developed regulatory definitions for WOTUS. A pivotal moment came with the 1985 United States Supreme Court case United States v. Riverside Bayview Homes, which upheld federal jurisdiction over wetlands adjacent to navigable waters. Subsequent regulatory actions oscillated with changing presidential administrations; the George W. Bush administration issued guidance limiting jurisdiction, while the Barack Obama administration promulgated the 2015 Clean Water Rule to clarify and expand protections. The Donald Trump administration later repealed that rule and replaced it with the narrower Navigable Waters Protection Rule, significantly reducing the number of protected waterways.

Legal challenges and Supreme Court rulings

The scope of WOTUS has been repeatedly challenged in federal courts, with several key cases reaching the United States Supreme Court. In the 2001 case Solid Waste Agency of Northern Cook County v. United States Army Corps of Engineers, the Court limited jurisdiction over isolated ponds. The 2006 case Rapanos v. United States resulted in a fractured 4-1-4 decision, with Justice Antonin Scalia writing a plurality opinion advocating a restrictive view and Justice Anthony Kennedy articulating the influential "significant nexus" test in his concurrence. This created regulatory uncertainty for nearly two decades. The issue was largely resolved by the 2023 case Sackett v. Environmental Protection Agency, where a unanimous Court rejected the "significant nexus" test, holding that WOTUS includes only relatively permanent, standing, or continuously flowing bodies of water and wetlands with a continuous surface connection to such waters.

Environmental and economic impact

The definition of WOTUS has profound consequences for ecosystems and industries. Broader definitions are championed by groups like the Sierra Club and Natural Resources Defense Council for protecting watershed functions, filtering pollutants, providing wildlife habitat, and mitigating floods. A narrower scope, advocated by organizations such as the National Association of Home Builders and American Petroleum Institute, reduces permitting requirements and compliance costs for developers, farmers, and mining companies, particularly in arid regions like the American Southwest. Studies by agencies like the United States Geological Survey have shown that a substantial percentage of stream miles and wetland acres lose federal protection under restrictive definitions, potentially impacting water quality in systems like the Chesapeake Bay.

Current status and ongoing debates

Following the Sackett v. Environmental Protection Agency decision, the Joe Biden administration issued a revised rule in 2023 to conform to the Supreme Court's narrower test. The current regulatory landscape significantly curtails federal jurisdiction, returning primary authority over many isolated wetlands and ephemeral streams to state governments under laws like the California Porter-Cologne Water Quality Control Act. Ongoing debates center on the adequacy of state-level protections, the scientific basis for the "continuous surface connection" requirement, and legislative efforts in the United States Congress to statutorily define WOTUS. The issue remains a flashpoint in the broader conflict between environmental regulation and property rights, ensuring it will persist as a central topic in administrative law and federalism.

Category:Clean Water Act Category:Water law in the United States Category:United States environmental law