Cal. Health & Safety Code § 54018

There shall be collected annually, in the same manner and at the same time as other state revenue is collected, a sum of money in addition to the ordinary revenues of the state, sufficient to pay the principal of, and interest on, the bonds each year. It is the duty of all officers charged by law with any duty in regard to the collections of state revenues to do or perform each and every act which is necessary to collect that additional sum.