Austin City Council to consider $600 million increase for Walnut Creek wastewater expansion

March 8, 2026

Austin City Council is preparing to consider a formal increase of about $600 million to the estimated cost of expanding the Walnut Creek wastewater treatment facility. City staff have updated their figures, and the council could act to adopt the new estimate at an upcoming meeting.

The added amount would push the wastewater project’s total close to the price of the recent convention center overhaul in Austin. That comparison underlines how large the revision is for a single municipal infrastructure project.

Austin Water is the department overseeing the expansion, and it presented the revised estimate for council consideration. Council members will weigh adopting the updated number as part of the city’s capital planning and budget process.

City planners cited updated cost projections when moving to increase the estimate. Rising construction and project costs have affected many municipal projects, and this adjustment reflects the latest financial outlook for the Walnut Creek expansion.

A higher estimate could influence how the city prioritizes upcoming capital projects and allocates funding across departments. Officials will need to decide whether to identify additional funds, alter the project scope, or re-order other investments to accommodate the larger price tag.

Council action to approve the revised estimate would not immediately change construction timelines, but it would set a new baseline for financial planning and public discussion. Residents and stakeholders can expect further council debate and details as staff provide supporting documents ahead of a vote.

City leaders still face choices about managing the expanded cost estimate while advancing wastewater infrastructure upgrades that serve Austin’s growing population. The council’s decision will shape how the project moves forward and how the city manages its broader capital program.