Cal. Health & Safety Code § 117810

(a) If a local agency does not elect to implement a medical waste management program, the local agency may elect to contract with another local agency to implement a medical waste management program or to implement it at a later date.
This election shall be made by the local governing body, that shall take effect 90 days after a notice of election is filed with the department.
(b) A local agency that elects to implement a medical waste management program shall continue to implement that program until the local governing body terminates the election by resolution or ordinance or the department revokes the authority of the local agency to administer a medical waste management program. The local agency shall file the notice of termination with the department at least 180 days prior to the termination date.