Cal. Government Code § 65302.9

(a) Within 24 months of July 2, 2013, each city and county within the Sacramento-San Joaquin Valley shall amend its general plan to contain all of the following: (1) (A) The data and analysis contained in the Central Valley Flood Protection Plan pursuant to Section 9612 of the Water Code, including, but not limited to, the locations of the facilities of the State Plan of Flood Control and the locations of the real property protected by those facilities. (B) The locations of flood hazard zones, including, but not limited to, locations mapped by the Federal Emergency Management Agency Flood Insurance Rate Map or the Flood Hazard Boundary Map, locations that participate in the National Flood Insurance Program, locations of undetermined risk areas, and locations mapped by a local flood agency or flood district. (2) Goals, policies, and objectives, based on the data and analysis identified pursuant to paragraph (1), for the protection of lives and property that will reduce the risk of flood damage. (3) Feasible implementation measures designed to carry out the goals, policies, and objectives established pursuant to paragraph (2). (b) An undetermined risk area shall be presumed to be at risk during flooding that has a 1-in-200 chance of occurring in any given year unless deemed otherwise by the State Plan of Flood Control, an official National Flood Insurance Program rate map issued by the Federal Emergency Management Agency, or a finding made by a city or county based on a determination of substantial evidence by a local flood agency. (c) To assist each city or county in complying with this section, the Central Valley Flood Protection Board, the Department of Water Resources, and local flood agencies shall collaborate with cities or counties by providing them with information and other technical assistance. (d) In implementing this section, each city and county, both general law and charter, within the Sacramento-San Joaquin Valley, shall comply with this article, including, but not limited to, Sections 65300.5, 65300.7, 65300.9, and 65301. (e) Notwithstanding any other law, this section shall apply to all cities, including charter cities, and counties within the Sacramento-San Joaquin Valley. The Legislature finds and declares that flood protection in the Sacramento and San Joaquin Rivers drainage areas is a matter of statewide concern and not a municipal affair as that term is used in Section 5 of Article XI of the California Constitution. (f) This section shall not be construed to limit or remove any liability of a city or county prior to the amendment of the general plan except as provided in Section 8307 of the Water Code.