Cal. Health & Safety Code § 117405

It is unlawful for any person or firm to carry on or engage in the business of the cleaning of septic tanks, chemical toilets, cesspools or sewage seepage pits or to dispose of the cleanings therefrom in any city, town, county, or city and county unless he or she or it shall hold an unrevoked registration issued by the local health officer or his or her duly authorized representative of the city, town, county, or city and county for the carrying on of the business.