California Public Utilities Commission (CPUC)
505 Van Ness Ave.
San Francisco, CA 94102
(800) 848-5580 / (415) 703-2782
CPUC question/complaint page
The Consumer Affairs Branch Web page describes CPUC’s system for resolving complaints involving service providers regulated by the agency: telecommunications, moving companies, passenger carriers, and private electricity, gas, water, and sewer utilities operating within the State of California.