Cal. Pub. Util. Code § 849.1
(a)
(e)
(f)
(i) Any surplus water supply charges in excess of the necessary amounts to pay the principal premium, if any, and interest on the water rate relief bonds and all other financing costs shall be credited to customers through the adjustment mechanism described in subdivision (g) or used to prepay or defease water rate relief bonds, so long as this would not result in a recharacterization of the tax, accounting, and other intended characteristics of the financing, including, but not limited to, the following: