California Code, Education Code - EDC § 56366.5

(a) Upon receipt of a request from a nonpublic, nonsectarian school for payment for services provided under a contract entered into pursuant to Sections 56365 and 56366, the local educational agency shall either (1) send a warrant for the amount requested within 45 days, or (2) notify the nonpublic, nonsectarian school within 10 working days of any reason why the requested payment shall not be paid.

(b) If the local educational agency fails to comply with subdivision (a), the nonpublic, nonsectarian school may require the local educational agency to pay an additional amount of 1 1/2 percent of the unpaid balance per month until full payment is made. The local educational agency may not claim reimbursement from the state for the additional amount pursuant to any provision of law, including any provision contained in Chapter 3 (commencing with Section 2201) of Part 4 of Division 1 of the Revenue and Taxation Code.

(c) Any educational funds received from a local educational agency for the educational costs of individuals with exceptional needs it has placed in nonpublic, nonsectarian schools shall be used solely for those purposes and not for the costs of a residential program.