Denver Water board to consider $62.6 million Marston treatment-basin contract
The board is scheduled to consider a contract to replace deteriorating infrastructure at the Marston plant; final costs and customer impacts remain unresolved.
Denver Water’s board is scheduled to consider a proposed, not-to-exceed $62.599 million contract to replace a deteriorating disinfection contact basin at the Marston Water Treatment Plant. The board had not voted as of July 18, four days before the scheduled July 22 meeting.
Denver Water’s July 22 agenda lists the contract with Hensel Phelps Construction Co. as an individual-action item and says staff recommends approval. The proposed term runs from July 22, 2026, through Oct. 31, 2028.
The basin is part of the century-old plant’s disinfection system. Denver Water says inspections found spalling concrete, cracks and exposed rebar. The agency describes the replacement as part of its South System Planning Program to preserve treatment reliability.
The proposed award followed a restricted proposal process involving four prequalified heavy-civil contractors. Hensel Phelps received the highest evaluation score, according to the agenda. The work would begin at about 60% design to allow early material procurement, with an amendment anticipated as the design advances to final design.
Denver Water plans to spend $13.261605 million on the project in 2026, requiring a budget variance, and $49.337395 million in future years. The agenda does not price the anticipated amendment or establish whether it would increase the contract ceiling. It also does not identify a project-specific outage, treatment change, water-quality effect or rate impact.
The board’s vote, motion wording and final contract terms remained unresolved as of July 18. Post-meeting minutes, a resolution or an executed contract will be needed to report any approval or amended costs.