CA Elec Code § 21601 (2021)
2021 California Code|Elections Code - ELEC|DIVISION 21 - STATE AND LOCAL REAPPORTIONMENT|CHAPTER 7 - City Elections|ARTICLE 1 - General Law Cities|Section 21601.

21601.  (a) Following a city’s decision to elect its council using district-based elections, or following each federal decennial census for a city whose council is already elected using district-based elections, the council shall, by ordinance or resolution, adopt boundaries for all of the council districts of the city so that the council districts shall be substantially equal in population as required by the United States Constitution.(1) Population equality shall be based on the total population of residents of the city as determined by the most recent federal decennial census for which the redistricting data described in Public Law 94-171 are available.(2) Notwithstanding paragraph (1), an incarcerated person as that term is used in Section 21003, shall not be counted towards a city’s population, except for an incarcerated person whose last known place of residence may be assigned to a census block in the city, if information about the last known place of residence for incarcerated persons is included in the computerized database for redistricting that is developed in accordance with subdivision (b) of Section 8253 of the Government Code, and that database is made publicly available.(b) The council shall adopt council district boundaries that comply with the United States Constitution, the California Constitution, and the federal Voting Rights Act of 1965 (52 U.S.C. Sec. 10301 et seq.).(c) The council shall adopt district boundaries using the following criteria as set forth in the following order of priority:(1) To the extent practicable, council districts shall be geographically contiguous. Areas that meet only at the points of adjoining corners are not contiguous. Areas that are separated by water and not connected by a bridge, tunnel, or regular ferry service are not contiguous.(2) To the extent practicable, the geographic integrity of any local neighborhood or local community of interest shall be respected in a manner that minimizes its division. A “community of interest” is a population that shares common social or economic interests that should be included within a single district for purposes of its effective and fair representation. Communities of interest do not include relationships with political parties, incumbents, or political candidates.(3) Council district boundaries should be easily identifiable and understandable by residents. To the extent practicable, council districts shall be bounded by natural and artificial barriers, by streets, or by the boundaries of the city.(4) To the extent practicable, and where it does not conflict with the preceding criteria in this subdivision, council districts shall be drawn to encourage geographical compactness in a manner that nearby areas of population are not bypassed in favor of more distant populations.(d) The council shall not adopt council district boundaries for the purpose of favoring or discriminating against a political party.(e)  For purposes of this article, “adopt” or “adoption” in regard to council district boundaries means the passage of an ordinance or resolution specifying those boundaries.(Amended by Stats. 2021, Ch. 320, Sec. 3. (SB 594) Effective September 27, 2021.)