Section 12222 Of Article 2. Precinct Formation From California Elections Code >> Division 12. >> Chapter 3. >> Article 2.

. (a) No precinct shall be established so that its boundary crosses the boundary of any supervisorial district, congressional district, senatorial district, Assembly district, board of equalization district, judicial district, incorporated city, ward, or city council district.
  (b) If, at any election, any precinct contains an insufficient number of qualified persons to make up a precinct board, the precinct may be consolidated with an adjoining precinct.