California Code, Civil Code - CIV § 4753

(a) For the purposes of this section, “clothesline” includes a cord, rope, or wire from which laundered items may be hung to dry or air. A balcony, railing, awning, or other part of a structure or building shall not qualify as a clothesline.

(b) For the purposes of this section, “drying rack” means an apparatus from which laundered items may be hung to dry or air. A balcony, railing, awning, or other part of a structure or building shall not qualify as a drying rack.

(c) Any provision of a governing document, as defined in Section 4150, shall be void and unenforceable if it effectively prohibits or unreasonably restricts an owner's ability to use a clothesline or drying rack in the owner's backyard.

(e) Nothing in this section shall prohibit an association from establishing and enforcing reasonable rules governing clotheslines or drying racks.