Cal. Welf. & Inst. Code § 4710
(a) The regional center or state-operated facility shall send adequate notice, as described in subdivision (a) of Section 4701, to the recipient and, if appropriate, the authorized representative, by standard mail, certified mail, or email at their preference as indicated in their individual program plan. This notice shall be sent at least 30 days prior to either of the following actions and shall specify the effective date of the action:
(d)
(1) The regional center shall, within 30 days after written notice is sent to the applicant or client, notify the department in writing of the denial if a lack of funds in the regional center budget is the reason for one of the following: