2005 California Financial Code Sections 4100 DIVISION 1.3. FINANCIAL INSTITUTIONS

4100.  On or after July 1, 2006, a supervised financial institution
shall not issue a consumer deposit account number to a customer, if
that account number was previously held by another customer of the
institution, until at least three years have passed since the account
of the other customer was closed. For purposes of this section,
"consumer deposit account number" means an account number that the
financial institution uses to identify a natural person's checking
account or share draft account established primarily for personal,
family, or household purposes and that includes the routing number of
that institution that is used to identify the institution
responsible for the payment of negotiable instruments.