What is included in the definition of waters of the U.S.?

The definition of "waters of the U.S." encompasses a broad range of water bodies and features. It includes all interstate waters, which are bodies of water that cross state boundaries, as well as wetlands that are adjacent to those waters. This is crucial because interstate waters and their connected wetlands play a significant role in the overall ecosystem, influencing both water quality and habitat availability.

Recognizing wetlands as part of this definition is important for regulatory and conservation efforts, as these areas are critical for filtration, flood control, and providing wildlife habitat. The inclusion of wetlands emphasizes the interconnectedness of aquatic ecosystems and underscores the importance of managing all aspects of water systems for environmental health.

The other options either limit the definition too narrowly or refer to water bodies that do not fall under federal jurisdiction. Understanding this broader definition is key for inspectors and those working in environmental protection and water quality management.