Water Code § 71689.20
ARTICLE 5. Sanitation Service
A district may acquire, construct, and operate facilities for, or may contract with others for, the collection and disposal of the garbage, waste, and trash of the district and its inhabitants. A district may not engage in, or contract with others for, the collection and disposal of garbage, waste, and trash in competition with any existing county franchise for the collection and disposal of garbage, waste, and trash.