California Code, Health and Safety Code - HSC § 117420

Registration shall be issued only after a satisfactory examination by the health officer or his or her duly authorized representative covering the equipment to be used, the applicant's knowledge of sanitary principles and of the laws and ordinances affecting human health or nuisances, and the reliability of the applicant in observing sanitary laws, ordinances and directions, and in selecting laborers and employees who may clean out septic tanks, chemical toilets, cesspools and sewage seepage pits without endangering human health or comfort; and only after examination of the place or places and manner of disposal of the cleanings proposed by the applicant.