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4 wetlands” because the “presence of water is ‘universally regarded as the most basic feature of wetlands’ ” proves too much. Brief for Respondents 19. It is also tough to square with SWANCC’s exclusion of isolated ponds or Riverside Bayview’s extensive focus on the adjacency of wetlands to covered waters. Finally, it is difficult to see how the States’ “responsibilities and rights” in regulating water resources would remain “primary” if the EPA had such broad jurisdiction. §1251(b). Pp. 14–18.

In sum, the CWA extends to only wetlands that are “as a practical