The purpose of this legislation is to amend the Federal Water Pollution Control Act, specifically to clarify what is meant by "navigable waters." The main objectives are to define the scope of federal jurisdiction over water bodies, limit federal authority over certain waters, and ensure that states retain control over their water resources. Key provisions of the legislation include a new definition of "navigable waters," which specifies that these waters must either be navigable-in-fact or be permanent bodies of water connected to navigable waters.