RCW 69.51A.260: Housing unit—No more than fifteen plants may be grown or located—Exception—Civil penalties.

(1) Notwithstanding any other provision of this chapter and even if multiple qualifying patients or designated providers reside in the same housing unit, no more than fifteen plants may be grown or located in any one housing unit other than a cooperative established pursuant to RCW 69.51A.250.

(2) Neither the production nor processing of cannabis or cannabis-infused products pursuant to this section nor the storage or growing of plants may occur if any portion of such activity can be readily seen by normal unaided vision or readily smelled from a public place or the private property of another housing unit.

(3) Cities, towns, counties, and other municipalities may create and enforce civil penalties, including abatement procedures, for the growing or processing of cannabis and for keeping cannabis plants beyond or otherwise not in compliance with this section.