Cal. Gov't Code § 70622

(a) In addition to the uniform filing fee authorized pursuant to Section 70611, 70612, 70613, 70614, 70650, 70651, 70652, 70653, 70655, or 70670, after giving notice and holding a public hearing on the proposal, the Board of Supervisors of Riverside County may impose a surcharge not to exceed fifty dollars ($50) for the filing in superior court of any of the following:
1. (1) A complaint, petition, or other first paper in a civil or probate action or special proceeding.
2. (2) A first paper on behalf of any defendant, respondent, intervenor, or adverse party.
3. (3) A petition for dissolution of marriage, dissolution of domestic partnership, legal separation, or nullity of marriage.
4. (4) A response to such a petition.
5. (5) A first paper on behalf of any party in a proceeding under Section 98.2 of the Labor Code.
(b) The county shall notify in writing the Superior Court of Riverside County and the Administrative Office of the Courts of any change in a surcharge under this section.
(c) When a surcharge under this section is imposed on a filing fee, the distribution that would otherwise be made to the State Court Facilities Construction Fund under subdivision (c) of Section 68085.3 or subdivision (c) of Section 68085.4 shall be reduced as provided in Section 70603.
(d) The surcharge shall be in an amount determined to be necessary by the board of supervisors to cover the costs of the seismic stabilization, construction, and rehabilitation of the Riverside County Courthouse, the Indio Branch Courthouse, and the family law courthouse, and collection thereof shall terminate upon repayment of the amortized costs incurred. When the amortized costs have been repaid, the county shall notify in writing the Superior Court of Riverside County and the Administrative Office of the Courts.