Cal. Gov't Code § 66484.5
(a) The legislative body of a local agency may adopt an ordinance requiring the payment of a fee as a condition of approval of a subdivision requiring a final or parcel map, or as a condition of issuing a building permit in an area of benefit under a groundwater recharge facility plan adopted as provided in this section, for the purpose of constructing recharge facilities for the replenishment of the underground water supply in that area of benefit. The ordinance may require payment of fees pursuant to this section if, at the time of payment, all of the following requirements are satisfied:
(3) The ordinance provides that before any groundwater recharge facility plan is adopted there will be a public hearing held by the legislative body for the proposed area of benefit.
Notice of the hearing on a proposed area of benefit shall be given pursuant to Section 65091 and shall include preliminary information concerning the groundwater recharge facility plan, including the proposed boundaries of the area of benefit, the availability of surface water, the planned facilities for the area of benefit, estimated costs, and the proposed method of fee apportionment.
Written notice of the public hearing shall be given by personal service or mail to the water agency responsible for furnishing water to the area of benefit involved in the hearing prior to or at the time notice is given by mail or by publication and posting. The proposal contained in the mailed, published, or posted notice shall be jointly prepared and agreed upon by the local agency and the water agency before that notice is given. The water agency may participate in the hearings.
(f) Fees paid pursuant to an ordinance adopted pursuant to this section shall be deposited in a planned recharge facility fund. A fund shall be established for each area of benefit. Money in the fund shall be expended solely for the construction or reimbursement for construction of the improvement serving the area to be benefited.
The fees shall not be expended to reimburse the cost of recharge facilities in existence prior to the adoption of the groundwater recharge facility plan for that area.