Wyo. Stat. § 41-3-910: State engineer; power to determine area and boundaries of districts.

The state engineer is authorized and directed to determine the area and boundaries of districts overlying the various aquifers yielding underground waters in this state and to assign to each district a distinctive name or number. He may establish subdistricts when parts of an aquifer require or may require separate regulations from the rest. He may alter the boundaries of such districts and subdistricts at any time. He may establish different districts for different aquifers that overlie each other in whole or in part.