For the purpose of administering this chapter, the boundaries of the Walla Walla River basin identified in the figure below are presumed to accurately reflect the basin located within Washington state.
Wash. Admin. Code § 173-532-120
Statutory Authority: Chapters 90.82, 90.54, 90.22, 90.03, and 90.44 RCW. 07-17-007 (Order 04-08), § 173-532-120, filed 8/2/07, effective 9/5/07.