The City of San Diego provides you with direct access to bidding and contracting opportunities on all its construction projects. To become prequalified to bid on City of San Diego public works projects, all other contractors must complete the online Prequalification Program Application.Learn how the County buys products and services. Search contracts, find open solicitations on BuyNet. The San Diego County is seeking qualified bids for the project, 2025 Urban Water Management Plan Support Services. Applications can be submitted at any time; however, the annual validity of the District's Informal Bidding Contractors List extends until December 31st. San Diego Contractor Bid Lists. Start a Free Quote. 619-773-1100. Search 2889 U.S. and Canadian government contracts for bid in San Diego (CA) that GovWin IQ is tracking. All projects are advertised for three to seven weeks and bids can be submitted and resubmitted at anytime prior to bid opening.