Commission approves $138 million contract and engineering amendment for Williamson Creek interceptor
Jan 14, 2026
The commission approved a $125.58 million construction contract (plus $12.56 million contingency, total $138.138 million) and unanimously approved a roughly $7.45 million amendment to the design engineer's contract to provide construction-phase services for the 3.5-mile Williamson Creek wastewater interceptor; staff described tunneling, odor control, environmental restoration and parkland mitigation.
The full story
The Water and Wastewater Commission on Jan. 14 approved a construction contract and an engineering-services amendment to advance the Williamson Creek wastewater interceptor project, a roughly 3.5-mile, 72-inch-diameter gravity interceptor that Austin Water said will be installed primarily by tunneling to increase capacity and reduce the risk of sanitary sewer overflows.
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