Cal. Penal Code § 4110

If women are to be sentenced to an industrial farm, the board of supervisors establishing it shall provide thereon separate quarters for women prisoners, or may establish a separate industrial farm for women prisoners. Nothing in the section shall be construed to impose any requirement upon a county to confine male and female prisoners in the same or an adjoining facility or impose any duty upon a county to establish or maintain programs which involve the joint participation of male and female prisoners.