Cal. Civ. Proc. Code § 1513.5

(a) Except as provided in subdivision (c), if the holder has in its records an address for the apparent owner, which the holder’s records do not disclose to be inaccurate, every banking or financial organization shall make reasonable efforts to notify any owner by mail or, if the owner has consented to electronic notice, electronically, that the owner’s deposit, account, shares, or other interest in the banking or financial organization will escheat to the state pursuant to clause (i), (ii), or (iii) of subparagraph (A) of paragraph (1), (2), or (6) of subdivision (a) of Section 1513. The holder shall give notice either:
1. (1) Not less than two years nor more than two and one-half years after the date of last activity by, or communication with, the owner with respect to the account, deposit, shares, or other interest, as shown on the record of the banking or financial organization.
2. (2) Not less than 6 nor more than 12 months before the time the account, deposit, shares, or other interest becomes reportable to the Controller in accordance with this chapter.
(b) The notice required by this section shall specify the time that the deposit, account, shares, or other interest will escheat and the effects of escheat, including the necessity for filing a claim for the return of the deposit, account, shares, or other interest. The face of the notice shall contain a heading at the top that reads as follows: “THE STATE OF CALIFORNIA REQUIRES US TO NOTIFY YOU THAT YOUR UNCLAIMED PROPERTY MAY BE TRANSFERRED TO THE STATE IF YOU DO NOT CONTACT US,” or substantially similar language. The notice required by this section shall, in boldface type or in a font a minimum of two points larger than the rest of the notice, exclusive of the heading, (1) specify that since the date of last activity, or for the last two years, there has been no owner activity on the deposit, account, shares, or other interest; (2) identify the deposit, account, shares, or other interest by number or identifier, which need not exceed four digits; (3) indicate that the deposit, account, shares, or other interest is in danger of escheating to the state; and (4) specify that the Unclaimed Property Law requires banking and financial organizations to transfer funds of a deposit, account, shares, or other interest if it has been inactive for three years. It shall also include a form, as prescribed by the Controller, by which the owner may declare an intention to maintain the deposit, account, shares, or other interest. If that form is filled out, signed by the owner, and returned to the banking or financial organization, it shall satisfy the requirement of clause (iii) of subparagraph (A) of paragraph (1), clause (iii) of subparagraph (A) of paragraph (2), or clause (iii) of subparagraph (A) of paragraph (6) of subdivision (a) of Section 1513. In lieu of returning the form, the banking or financial organization may provide a telephone number or other electronic means to enable the owner to contact that organization. The contact, as evidenced by a memorandum or other record on file with the banking or financial organization, shall satisfy the requirement of clause (iii) of subparagraph (A) of paragraph (1), clause (iii) of subparagraph (A) of paragraph (2), or clause (iii) of subparagraph (A) of paragraph (6) of subdivision (a) of Section 1513. If the deposit, account, shares, or other interest has a value greater than two dollars ($2), the banking or financial organization may impose a service charge on the deposit, account, shares, or other interest for this notice in an amount not to exceed the administrative cost of mailing or electronically sending the notice and form and in no case to exceed two dollars ($2).
(c) Notice as provided by subdivisions (a) and (b) shall not be required for deposits, accounts, shares, or other interests of less than fifty dollars ($50), and, except as provided in subdivision (b), no service charge may be made for notice on these items.
(d) In addition to the notices required pursuant to subdivision (a), the holder may give additional notice as described in subdivision (b) at any time between the date of last activity by, or communication with, the owner and the date the holder transfers the deposit, account, shares, or other interest to the Controller.
(e) At the time a new account is opened with a banking or financial organization, the organization shall provide a written notice to the person opening the account informing the person that his or her property may be transferred to the appropriate state if no activity occurs in the account within the time period specified by state law. If the person opening the account has consented to electronic notice, that notice may be provided electronically.