Bid guide
How to bid on digester rehabilitation for Delta Diablo
What Delta Diablo is buying
Delta Diablo is seeking a contractor to rehabilitate two existing anaerobic digesters at its wastewater treatment plant in Antioch, California. The work includes cleaning, concrete and coating repairs, equipment and piping replacement, drainage improvements, and testing and commissioning.
The project also covers valves, instrumentation, sludge sampling and heat exchange systems, variable frequency drives, exterior coating repairs, and bird netting replacement. It is an invitation for bids, or IFB, under project number 25116.
Key dates and the bid deadline
The solicitation was published October 15, 2026. The pre-bid meeting is scheduled for October 22, 2026, at 10:00 AM.
Bids are due November 10, 2026, at 5:00 PM ET. Submit electronically through PlanetBids before the deadline; the stated deadline is when your bid must be in.
Who this opportunity suits
This opportunity suits construction contractors with relevant experience rehabilitating wastewater treatment plant infrastructure, particularly digesters and related process systems.
Firms should assess whether they can address the mix of cleaning, concrete and coating repairs, mechanical and piping work, drainage, and commissioning described in the project.
How to access and submit a bid
Open the agency’s PlanetBids listing using the “View original source” link. The scope, dates, and document list are public. PlanetBids may ask you to complete a “confirm you are human” check before the page loads.
To download documents, receive addenda, and submit electronically, register a free PlanetBids vendor account with Delta Diablo. Submit your bid through the portal before the due date.
Prepare a complete, competitive response
Review the bid documents carefully to understand the required work, submission instructions, and any required forms. Use the document list to make sure you have the full set before preparing your response.
Attend the pre-bid meeting if useful, and check PlanetBids for addenda as you prepare your bid. Build in time to complete portal registration, upload your response, and confirm it has been submitted before the deadline.
See the live bid — deadline, agency details, and how to respond
Dates and requirements can change via addenda; always verify on the bid page and at the original source before responding.
View this bid on BiddingSimpleThis guide was prepared by BiddingSimple from the solicitation’s public posting. It is not official guidance from Delta Diablo; the original posting controls.