GOV §17518.5: (a) “Reasonable reimbursement methodology” means a formula for reimbursing local agencies and school districts for costs mandated by the state, as defined in Section 17514.

(a) “Reasonable reimbursement methodology” means a formula for reimbursing local agencies and school districts for costs mandated by the state, as defined in Section 17514. (b) A reasonable reimbursement methodology shall be based on cost information from a representative sample of eligible claimants, information provided by associations of local agencies and school districts, or other projections of local costs. (c) A reasonable reimbursement methodology shall consider the variation in costs among local agencies and school districts to implement the mandate in a cost-efficient manner. (d) Whenever possible, a reasonable reimbursement methodology shall be based on general allocation formulas, uniform cost allowances, and other approximations of local costs mandated by the state, rather than detailed documentation of actual local costs. In cases when local agencies and school districts are projected to incur costs to implement a mandate over a period of more than one fiscal year, the determination of a reasonable reimbursement methodology may consider local costs and state reimbursements over a period of greater than one fiscal year, but not exceeding 10 years. (e) A reasonable reimbursement methodology may be developed by any of the following: (1) The Department of Finance. (2) The Controller. (3) An affected state agency. (4) A claimant. (5) An interested party. (f) This section shall become operative on July 1, 2019.