Posting Language
Title
Authorize a contract for construction services for the Williamson Creek Wastewater Interceptor Project for Austin Water with Williamson Creek Constructors JV in the amount of $125,580,000, plus a $12,558,000 contingency, for a total contract amount not to exceed $138,138,000. Funding: $138,138,000 is available in the Capital Budget of Austin Water.
Body
Lead Department
Austin Financial Services.
Managing Department
Austin Capital Delivery Services.
Fiscal Note
Funding is available in the Capital Budget of Austin Water.
Procurement Language:
Austin Financial Services issued a Competitive Sealed Proposal solicitation CSP 6100 CLMB342 for these services. The solicitation was published on June 30, 2025, and closed on October 14, 2025. Of the four offers received, the proposal submitted by the recommended contractor submitted the best value to the City based on the solicitation's evaluation criteria. A complete solicitation package, including a log of offers received, is available for viewing on the City’s website. This information can currently be found at <https://financeonline.austintexas.gov/afo/account_services/solicitation/solicitation_details.cfm?sid=138666> .
MBE / WBE:
This contract will be awarded in compliance with City Code Chapter 2-9A (Minority-Owned and Women-Owned Business Enterprise Procurement Program) by meeting the goals with 9.04% MBE and 1.48% WBE participation.
Prior Council Action:
May 4, 2023 - Council authorized use of Competitive Sealed Proposal Method of contracting as the type of Alternative Delivery Method, Item 8, Resolution No. 20230504-008 Approved on Consent without objection.
For More Information:
Direct questions regarding this Recommendation for Council Action to Austin Financial Services - Central Procurement at: FSDCentralProcurementRCAs@austintexas.gov or 512-974-2500. Respondents to the solicitation and their Agents should direct all questions to the Authorized Contact Person identified in the solicitation.
Council Committee, Boards and Commission Action:
January 14, 2026 - To be reviewed by the Water and Wastewater Commission.
Additional Backup Information:
The wastewater collection system is essential for conveying wastewater to the treatment plants. Due to growth in Austin and material degradation from the harsh wastewater environment, existing collection system assets require repair and replacement. The Williamson Creek Wastewater Interceptor project will replace an existing wastewater pipeline along and near Williamson Creek and includes the construction of approximately 18,800 linear feet of a new 72-inch diameter gravity interceptor. This project will be utilizing trenchless construction methods with the large majority of the installation being completed as a tunnel. The project also includes the construction of a new biological odor control facility, where feasible the removal of the existing wastewater infrastructure that is being abandoned, environmental restoration of any affected project areas, and the conveyance of four acres to Austin Park and Recreation as well as an additional acre of trail easements.
The project extends along Williamson Creek from just east of Pleasant Valley Road to South First Street.
Due to the potential for unforeseen conditions underground along the 3.5-mile tunnel, a 10% contingency in funding has been included to allow for the expeditious processing of any change orders to cover any unforeseen construction costs associated with the project. By authorizing the additional contingency funding, Council is authorizing any change orders within the contingency amount.
Parts of the construction will be on City parkland. Williamson Creek Greenbelt trails will also be temporarily affected in certain areas, restricting public access along the creek. All disturbed areas will be restored by project completion. Most of the construction will occur along the creek, but there will be some localized traffic impacts in residential neighborhoods. Austin Water will provide advance notice for any local construction impacts to roads or properties and the contractor will install appropriate traffic signs and barricades to direct traffic.
If this contract is not approved, construction would be delayed prolonging the replacement of aged infrastructure that may lead to the potential of overflow events.
The contract allows 1,372 calendar days for completion of this project.
This project is located within zip codes 78744, 78745 (Districts 2, 3).