Cal. Pen. Code § 373a
Each person who maintains, permits, or allows a public nuisance to exist upon his or her property or premises, and each person occupying or leasing the property or premises of another who maintains, permits, or allows a public nuisance to exist on the property, after reasonable notice in writing from a health officer, district attorney, city attorney, or city prosecutor to remove, discontinue, or abate the public nuisance has been served upon the person, is guilty of a misdemeanor. The existence of the public nuisance for each and every day after the service of the notice is a separate and distinct offense, and it is the duty of the district attorney, or the city attorney or city prosecutor of any city the charter of which imposes the duty upon the city attorney or city prosecutor to prosecute state misdemeanors, to continuously prosecute all persons guilty of violating this section until the nuisance is abated and removed.
Ca. Pen. Code § 373a