Section 31930 Of Article 2. Retirement System From California Government Code >> Division 4. >> Title 3. >> Part 3. >> Chapter 4. >> Article 2.

. This chapter shall become effective in any county upon its acceptance by ordinance passed by four-fifths vote of its board of supervisors, and becomes operative in the county on January 1st or July 1st following the expiration of three months after the passage of the ordinance.