Work at the Doe Branch Water Reclamation Plant that serves Celina and Prosper is no longer just a line item on a capital plan. The long-planned expansion is now fully in motion, with officials aiming to boost treatment capacity from 4 million gallons a day to 12 and wrap major construction by fall 2028. Celina’s council has signed off on a fresh contract amendment while Upper Trinity Regional Water District crews keep pushing new construction packages on site. The project has already been re-priced several times as rapid growth in the area drives demand for more sewer capacity.
Councils Get the Briefing, Celina Signs the Amendment
At Dec. 9 work sessions, both Prosper Town Council and the Celina City Council were given status updates on the Doe Branch expansion. Celina’s council then voted unanimously to tack an additional $12 million onto the project’s most recent contract amendment, according to Community Impact. That reporting notes that the current scope covers not only the plant’s capacity jump from 4 mgd to 12 mgd but also a new wastewater interceptor running to Fishtrap Road.
UTRWD Timeline: Phase 3 Targeted for Late 2028
According to the Upper Trinity Regional Water District, Phase 3 construction began in 2025 and is projected to finish in mid-to-late 2028 as the district expands Doe Branch from 4 mgd to 12 mgd. On its project page, UTRWD frames the work as part of a broader push to boost treatment capacity across fast-growing Denton and Collin counties.
Price Tag and Construction Progress
A Prosper Town Council presentation from Dec. 9 breaks down the scope and pegs the combo of the Doe Branch build and its parallel interceptor at roughly $274 million in total, covering construction, CMAR packages, engineering and project management. Those town slides also show late-2025 progress on aeration basins, clarifiers and the influent pump station, signaling that crews have moved well beyond early dirt work, according to Town of Prosper documents.
What It Means for Bills and Service
Prosper has already adopted higher water and wastewater rates in its 2025-26 budget, and town staff are projecting additional increases in the years ahead, according to Community Impact. That reporting also cites city officials who say the latest $12 million amendment is expected to be the final price adjustment. UTRWD is financing construction through bond sales, which member cities will pay back through monthly district billing.
Next Steps and Schedule
Town presentation materials and the district’s project page show the parallel interceptor is scheduled to be finished before the expanded plant itself. The pipeline is expected to be in service around fall 2027, with the upgraded plant coming online in 2028. Officials plan to keep reporting on milestones at council meetings and through district updates as costs and schedules firm up, and residents can track future agendas for additional detail. The latest slides and timelines are available from the Town of Prosper and on the Upper Trinity Regional Water District project page.
