Cal. Pub. Res. Code § 4166

A person who violates this article is guilty of a misdemeanor, which is punishable by a fine of not less than one hundred dollars ($100) nor more than one thousand dollars ($1,000). If the defendant refuses, on conviction, to pay the fine, the defendant shall be confined in the county jail of the county in which conviction is had for a period not to exceed one day for every five dollars ($5) of the fine imposed, or may be subject to both the fine and imprisonment.