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source, identified in a permit or permit application under §402 of the CWA, that are caused by events occurring within the scope of relevant operating or treatment systems. For purposes of this part, the term discharge shall not include any discharge of oil that is authorized by a permit issued under X13 of the River and Harbor Act of 1899 (33 USC 407). Navigable Waters The waters of the United States, including the territorial seas. 1. The term includes: (i) All waters that are currently used, were used in the past, or may be susceptible to use in interstate or foreign commerce, including all waters subject to the ebb and flow of the tide. (ii) All interstate waters, including interstate wetlands. (iii) All other waters such as intrastate lakes, rivers, streams (including intermittent streams), mudflats, sandflats, wetlands, sloughs, prairie potholes, wet meadows, playa lakes, or natural ponds, the use, degradation, or destruction of that could affect interstate or foreign commerce including any such waters: • That are, or could be, used by interstate or foreign travelers for recreational or other purposes; • From which fish or shellfish are, or could be, taken and sold in interstate or foreign commerce; or • That are, or could be, used for industrial purposes by industries in interstate commerce. (iv) All impoundments of waters otherwise defined as waters of the United States under this section; (v) Tributaries of waters identified in paragraphs (1)(i) through (iv) of this definition; (vi) The territorial sea; and (vii) Wetlands adjacent to waters (other than waters that are themselves wetlands) identified in paragraph (1) of this definition. 2. Waste treatment systems, including treatment ponds or lagoons designed to meet the requirements of the CWA (other than cooling ponds, which also meet the criteria of this definition) are not waters of the United States. Navigable waters do not include prior converted cropland. Notwithstanding the determination of an area's status as prior converted cropland by any other Federal agency, for the purposes of the CWA, the final authority regarding CWA jurisdiction remains with the USEPA.