Wash. Rev. Code § 15.15.010
Growers of seed potatoes, certified in accordance with rules adopted under chapter 15.14 RCW, may submit a petition to the director of the department of agriculture requesting that the director establish a restricted seed potato production area. The petition shall include the proposed geographic boundaries of the restricted seed potato production area, and the types of restrictions that are proposed to apply to the growing of nonseed potatoes. The petition shall contain the signatures of at least fifty percent of the growers of certified seed potatoes who have produced at least fifty percent of the certified seed potatoes within the proposed restricted seed potato production area in each of the two preceding years.
Upon receipt of a petition submitted in accordance with this section, the director of the department of agriculture shall, within sixty days of receipt of the petition, investigate the need of establishing a restricted seed potato production area. The director may propose rules and hold public hearings in the area affected by the proposed rules. The director has the authority to adopt rules in accordance with chapter 34.05 RCW to establish restricted seed potato production areas to prevent the increased exposure to plant diseases and insect pests that adversely affect the ability to meet standards for certification of seed potatoes established under chapter 15.14 RCW.
RCW 15.15.010