Environmental

The 'Clean Water Act' regulates discharge into 'waters of the United States,' which in Arizona includes:

AOnly year-round flowing rivers and lakes
BNavigable waters and their tributaries, which in Arizona may include ephemeral and intermittent streams (washes) that flow only during rain events—a major consideration given Arizona's desert geography✓ Correct
COnly federally owned water bodies
DSwimming pools and artificial water features on private property

Explanation

Waters of the United States has been an evolving legal definition, but has generally included navigable waters and tributaries. In Arizona, this is significant because many washes and arroyos are ephemeral (flow only during rain).

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