Food and Agricultural Code § 38186
ARTICLE 2. Skim Milk, Nonfat Milk, or Fat-free Milk
Every container of skim milk, nonfat milk, or fat-free milk, except a glass container, shall be labeled with the words “skim milk,” “nonfat milk,” or “fat-free milk” in letters not less than one-quarter inch in height and one-eighth inch in width.