California Code, Government Code - GOV § 20841

(a) The employer contribution rate for a contracting agency, county office of education, school district, or community college district participating in a risk pool shall be determined by the actuary, taking into account the difference between the assets and liabilities that were brought into the risk pool with respect to the affected member classifications.

(b) The employer contribution rate for a contracting agency, county office of education, school district, or community college district participating in a risk pool may take into account the differences in the benefits provided by each employer to its members in the classification included in the risk pool.

(c) If a county office of education, school district, or community college district participates in a risk pool pursuant to this section and pays a contribution rate that differs from the rate established for school employers participating in a single account with respect to school members pursuant to subdivision (b) of Section 20225, the actual rate of employer contributions made to the Public Employees' Retirement System, for purposes of Section 42238.12 of the Education Code, shall be deemed to be the contributions that the county office of education or the district would have paid had the county office of education or the district participated in a single account for school members pursuant to subdivision (b) of Section 20225.