Rollback Proposed On Obama-Era Rules Defining 'Waters Of The United States'04:17
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The protection of U.S. rivers and some of their tributaries falls under the Clean Water Act. But exactly which tributaries are covered by the act has led to many legal battles since it first passed in 1972. KJZZ's Bret Jaspers (@bretjaspers) reports.

This segment aired on April 22, 2019.

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