Cal. Pub. Cont. Code § 20415

The legislative body may reject any and all proposals or bids should it deem this for the public good, and also the bid of any party who has been delinquent or unfaithful in any former contract with the city, and shall reject all proposals or bids other than the lowest regular proposal or bid of any responsible bidder, and may award the contract for said work or improvement to the lowest responsible bidder at the prices named in his bid. If the bids are rejected the legislative body shall thereupon return to each bidder the check or bond which accompanied his bid.