California Code, Education Code - EDC § 47611

(b)(1) If a charter school offers its employees coverage by the State Teachers' Retirement System or the Public Employees' Retirement System, or both, the charter school shall inform all applicants for positions within that charter school of the retirement system options for employees of the charter school.

(2) The information shall specifically include whether the charter school makes available to employees coverage under the State Teachers' Retirement System, the Public Employees' Retirement System, or both systems, and that accepting employment in the charter school may exclude the applicant from further coverage in the applicant's current retirement system, depending on the retirement options offered by the charter of the charter school.