Except as otherwise provided in Sections 27550.1 and 27641.1 or in this section, or in Section 21123 or 34711 of the Water Code, or in any landowner voting district, as defined in paragraph (8) of subdivision (b) of Section 10500 of the Elections Code, a person is not eligible to a county or district office, unless he or she is a registered voter of the county or district in which the duties of the office are to be exercised at the time that nomination papers are issued to the person or at the time of the appointment of the person.
The board of supervisors or any other legally constituted appointing authority in a county or district may, if it finds that the best interests of the county or district will be served, waive the requirements of this section for an appointed county or district office.