Cal. Water Code § 12894.7

The department shall require the payment of interest on each loan that is made pursuant to Section 12894.3 at a rate equal to the weighted average of the interest rates paid by the state on bonds issued under the California Water Resources Development Bond Act (Chapter 8 (commencing with Section 12930) of this part), without regard to any premiums received on the sale of such bonds, as of the date of the loan.