Cal. Health and Safety Code § 51375

The bonds of the agency shall be legal investments in which all public officers and public bodies of this state, its political subdivisions, all municipalities and municipal subdivisions, all insurance companies and associations and other persons carrying on an insurance business, all banks, bankers, banking institutions, including savings and loan associations, building and loan associations, trust companies, savings banks and savings associations, investment companies and other persons carrying on a banking business, all administrators, guardians, conservators, executors, trustees and other fiduciaries, and all other persons whatsoever who are now or may hereafter be authorized to invest in bonds or in other obligations of the state, may properly and legally invest funds, including capital, in their control or belonging to them. The bonds may be used by any such private financial institution, person, or association as security for public deposits. The bonds are also hereby made securities which may properly and legally be deposited with and received by all public officers and bodies of the state or any agency or political subdivision of the state and all municipalities and public corporations for any purpose for which the deposit of bonds or other obligations of the state is now or may hereafter be authorized by law, including deposits to secure public funds.