Cal. Gov't Code § 65962.4

(a) For purposes of Sections 65865.5, 65962, and 66474.5, the following locations shall achieve the urban level of flood protection by 2030:
1. (1) The Natomas subarea of the City of Sacramento.
2. (2) The Beach Lake subarea of the City of Sacramento and the Beach Lake subarea of the unincorporated area of the County of Sacramento.
3. (3) The portions of the Natomas subarea located in the unincorporated area of the County of Sacramento and the portions of the Natomas subarea located in the unincorporated area of the County of Sutter.
4. (4) The City of Marysville protected by the Marysville Ring Levee located in the City of Marysville in the County of Yuba.
(b) Notwithstanding paragraph (2) of subdivision (a) of Section 8307 of the Water Code, the City of Marysville, the City of Sacramento, the County of Sacramento, the County of Sutter, or the County of Yuba may be required to contribute its fair and reasonable share of any property damage caused by a flood in its respective jurisdiction, to the extent that the state’s exposure to liability for property damage has been increased by the city or county unreasonably approving, as defined in Section 8307 of the Water Code, any new development in paragraph (1), (2), (3), or (4) of subdivision (a) until the city or county finds that the area has met the urban level of flood protection as defined in subdivision (n) of Section 65007.
(c) For purposes of this section, the following definitions apply:
1. (1) “Beach Lake subarea of the City of Sacramento” means the area within the City of Sacramento bounded on the north by Sutterville Road, on the west and south by the city limits, and on the east by Highway 99.
2. (2) “Beach Lake subarea of the unincorporated area of the County of Sacramento” means the unincorporated area of the County of Sacramento that is bounded on the west by the Sacramento River, on the north by the City of Sacramento city limits, on the east by Franklin Boulevard, and on the south by the City of Elk Grove city limits to Interstate 5 and along the North Beach Lake Levee from west of Interstate 5 to the Sacramento River.
3. (3) “City of Marysville” means the incorporated area of the City of Marysville as identified in the 2021–29 General Plan Housing Element Update adopted by Resolution 2021–34 by the Marysville City Council on November 16, 2021.
4. (4) “City of Sacramento” means the incorporated area in the City of Sacramento identified in Resolution No. 2021-0001, adopted by the Sacramento Independent Redistricting Commission, December 16, 2021, entitled “Establishing the Sacramento City Council District Boundaries Pursuant to the Sacramento City Charter, the California Elections Code, and the 2020 United States Census.”
5. (5) “Natomas subarea” means any of the following:
  1. (A) The area within the City of Sacramento bounded on the north and west by the city limits, on the south by the Garden Highway or Arden-Garden Connector, and on the east by East Levee Road.
  2. (B) The unincorporated area of the County of Sacramento that is bounded on the north and west by the unincorporated County of Sacramento limits, on the east by East Levee Road, and on the south by Interstate 80.
  3. (C) The unincorporated area of the County of Sutter that is bounded by the Sacramento River, the Natomas Cross Canal, the Pleasant Grove Creek Canal or Steelhead Creek, and the unincorporated County of Sutter limits.