The current California State law allows for ADUs, provided there is a sewer system available to serve those lots/properties. Proposals for ADUs to be served by an OWTS must comply with the current statewide OWTS Policy.
California’s right to ADUs are contingent based on SB-1069, Sec. 5. 65852.2(a)(1)A and AB-2299, SEC. 1.5 65852.2(a)(1)(A)