Wash. Rev. Code § 49.17.022
The legislature finds that the state's farms are diverse in their nature and the owners, managers, and their employees continually find new ways to plant, raise, harvest, process, store, market, and distribute their products. The legislature further finds that the department of labor and industries needs guidance in determining when activities related to agricultural products are to be regulated as agricultural activities and when they should be regulated as other activities. It is the intent of the legislature that activities performed by a farmer as incident to or in conjunction with his or her farming activities be regulated as agricultural activities. For this purpose, an agricultural activity is to be interpreted broadly, based on the definition of "agriculture" in RCW 49.17.020.
RCW 49.17.022