What action related to wetlands requires regulatory approval?

The action that requires regulatory approval in relation to wetlands is draining or filling land. Wetlands are critical ecosystems that provide a variety of ecological functions, including water filtration, flood protection, and habitat for wildlife. Because of their importance and vulnerability, the federal government, through the Clean Water Act, regulates activities that might negatively impact these areas.

Draining or filling wetlands can drastically alter their natural state, affecting local biodiversity and water quality. Consequently, any proposed changes to the physical characteristics of wetlands typically necessitate a permit from the appropriate regulatory authority, such as the Army Corps of Engineers, to ensure that environmental protections are upheld.

Conversely, selling wetlands, making additions to property, or engaging in natural preservation efforts are not actions that inherently require regulatory approval in the same way. Selling wetlands may have associated legal requirements, but it does not directly affect the wetland's ecological integrity. Similarly, while additions to property might need permits for construction, they do not specifically concern the direct alteration of wetland areas unless they involve drainage or filling. Natural preservation is generally encouraged and does not require regulatory approval like the physical alterations that can harm wetlands do.