Provides that, notwithstanding any other provisions of chapter 90.48 RCW, the application of barley straw to waters of the state for the purposes of water clarification is not a discharge of a pollutant requiring a permit as long as the designated provisions are met.

Declares that the placement of barley straw into waters of the state in any other instance is not authorized absent a permit.

Declares that this act does not alter any permit requirement that may exist under chapter 77.55 RCW.