"Household substance" means any substance which is customarily produced or distributed for sale for consumption or use, or customarily stored, by individuals in or about the household and which is:

(1) A "hazardous substance", which means (a) any substance or mixture of substances or product which (i) is toxic, (ii) is corrosive, (iii) is an irritant, (iv) is a strong sensitizer, (v) is flammable or combustible, or (vi) generates pressure through decomposition, heat, or other means, if such substance or mixture of substances may cause substantial personal injury or substantial illness during or as a proximate result of any customary or reasonably foreseeable handling or use, including reasonably foreseeable ingestion by children; (b) any substances which the director by regulation finds to meet the requirements of subsection (1)(a) of this section; (c) any radioactive substance, if, with respect to such substance as used in a particular class of article or as packaged, the director determines by regulation that the substance is sufficiently hazardous to require labeling in accordance with this chapter in order to protect the public health, safety or welfare; and (d) any toy or other article intended for use by children which the director by regulation determines presents an electrical, mechanical or thermal hazard.

(2) A pesticide as defined in the Washington Pesticide Control Act, chapter 15.58 RCW as now or hereafter amended;

(3) A food, drug, or cosmetic as those terms are defined in the Uniform Washington Food, Drug and Cosmetic Act, chapter 69.04 RCW as now or hereafter amended; or

(4) A substance intended for use as fuel when stored in portable containers and used in the heating, cooking, or refrigeration system of a house; or

(5) Any other substance which the director may declare to be a household substance subsequent to a hearing as provided for under the provisions of chapter 34.05 RCW, Administrative Procedure Act, for the adoption of rules.