Bid guide
How to bid on GAC Treatment Optimization for Upper Occoquan Service Authority
What the agency is buying
The Upper Occoquan Service Authority needs a contractor for Phase 1 of a granular activated carbon (GAC) treatment optimization project. This work involves converting one two-cell carbon contactor into a PFAS pilot system, restoring upflow and downflow operation, and evaluating carbon transfer improvements. If authorized, Phase 2 would involve retrofitting seven additional contactors with the selected improvements.
This is a significant construction opportunity for firms specializing in water treatment infrastructure or similar industrial process improvements. The project location is 14631 Compton Rd., Centreville, VA 20121.
Key dates and what happens at the deadline
This Invitation for Bid (IFB) was published on September 04, 2026. The deadline for responses is October 06, 2026, at 10:00 AM ET. All responses must be submitted by this time.
At the deadline, the agency will stop accepting bids. Late submissions will not be considered.
Who this opportunity suits
This opportunity is suitable for construction firms with experience in water treatment plant upgrades, particularly those familiar with granular activated carbon systems, underdrain nozzle systems, and process optimization. Firms with expertise in environmental engineering or specialized industrial construction would be a good fit.
The project involves detailed modifications to existing infrastructure, so a strong background in similar mechanical and civil construction work is important.
How to respond
To respond to this solicitation, you must access it through eVA, Virginia's eProcurement portal. The solicitation number is 127897. Viewing the posting is public and does not require an account.
To submit a response, you will need to sign in with a free eVA vendor account. Ensure you complete your sign-in and submit your bid before the October 06, 2026, 10:00 AM ET deadline.
Practical tips for preparing a competitive response
For an Invitation for Bid (IFB) like this, your focus should be on providing a clear, complete, and competitive price. Ensure your bid accurately reflects all costs associated with Phase 1 of the project, as described in the contract documents.
Carefully review all specifications and drawings provided in the solicitation. Pay close attention to any specific material requirements, construction methods, or performance standards. Any deviations or exceptions should be clearly noted if allowed, but typically IFBs require strict adherence to specifications. Double-check all calculations and ensure your bid is free of errors before submission.
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 Upper Occoquan Service Authority; the original posting controls.