The bonds issued under this chapter shall be subject to investigation and certification by the State Treasurer under the Districts Securities Law (Chapter 1 (commencing with Section 20000), Division 10, Water Code) as such law reads or is hereafter amended to read. If the State Treasurer determines that the bonds are adequately secured and the revenues of the authority applicable to the payment thereof are or will be sufficient to pay the principal and interest of the bonds, and if the State Treasurer certifies to that effect, the bonds shall be eligible as legal investments for both public and private funds in the same manner as provided in the Districts Securities Law.