Cal. Pub. Util. Code § 1007.5

The commission, in the exercise of the jurisdiction conferred upon it by the Constitution of the state and by this part, and consistent with Section 9 of Article I of the California Constitution and Section 10 of Article I of the United States Constitution, may grant certificates of public convenience and necessity, make decisions and orders, and prescribe rules affecting vessel common carriers notwithstanding the provisions of any ordinance, permit, or franchise of any city, county, or other political subdivision of this state, and in the case of conflict between any certificate, decision, order, or rule of the commission and any ordinance, permit, or franchise, the certificate, decision, order, or rule of the commission shall prevail.