In two cases recently considered by the Supreme Court, the plaintiffs contend that the federal government has overstepped its bounds by regulating wetlands that are not adjacent to navigable waters. If the high court finds in favor of the plaintiffs, the federal government's jurisdiction over so-called isolated wetlands could be significantly curtailed. At the same time, such a decision could call into question the regulatory status of thousands of miles of tributaries under the Clean Water Act (cwa) .
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