CA Health & Safety Code Section 108125

The term “hazardous substance” means:

(a)

Any substance or mixture of substances that (1) is toxic, (2) is corrosive, (3) is an irritant, (4) is a strong sensitizer, (5) is flammable or combustible, or (6) generates pressure through decomposition, heat, or other means; if the 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 that the department by regulation finds pursuant to the provisions of Section 108320 meet the requirements of subdivision (a) of this section.

(c)

Any radioactive substance, if, with respect to the substance as used in a particular class of article or as packaged, the department determines by regulation that the substance is sufficiently hazardous to require labeling in accordance with this chapter in order to protect the public health.

(d)

Any toy or other article intended for use by children that the department determines, by regulation, pursuant to the provisions of Section 108320, presents an electrical, mechanical, or thermal hazard.