California Code, Health and Safety Code - HSC § 113090

(a) If it bears or contains any poisonous or deleterious substance that may render it injurious to health; but in case the substance is not an added substance, the pet food shall not be considered adulterated under this subdivision if the quantity of the substance in pet food does not ordinarily render it injurious to health.

(b) If it bears or contains any added poisonous or deleterious substance, any food additive, any pesticide chemical, or any color additive that is unsafe within the meaning of the Federal Food, Drug and Cosmetic Act, or Part 5 (commencing with Section 109875), or Division 7 (commencing with Section 12501) of the Food and Agricultural Code.

(c) If it contains a pet food ingredient for which a standard of identity has been established and the pet food ingredient fails to meet that standard.

(d) If it has been produced, prepared, packed or held under insanitary conditions whereby it may have become contaminated with filth, or whereby it may have been rendered diseased, unwholesome or injurious to health.

(e) If its container is composed, in whole or in part, of any poisonous or deleterious substance that may render the contents injurious to health.

(f) If any valuable constituent has been in whole or in part omitted or abstracted therefrom.

(g) If any substance has been substituted wholly or in part therefor.

(h) If damage or inferiority has been concealed in any manner.

(i) If any substance has been added thereto or mixed or packed therewith so as to increase its bulk or weight or reduce its quality or strength or make it appear better or of greater value than it is.