Pittsburgh’s $3.5 billion ALCOSAN tunnel project breaks ground after decades of delay
(UI) — After nearly two decades of debate, Pittsburgh has launched the long-awaited ALCOSAN wastewater infrastructure project, which includes expanding its treatment plant and constructing 16 miles of underground tunnels to capture sewage-laden stormwater before it reaches rivers and streams, according to CBS News.
The project’s first phase involves building a 3.8-mile tunnel beneath the Allegheny and Ohio rivers, stretching from the 16th Street Bridge to the treatment plant. Bids are expected in November, with construction starting next year at an estimated cost of $800 million.
A tunnel-boring machine will dig up to 150 feet below ground, largely invisible to the community at street level, CBS News reported.
City officials emphasize that the project, although mandated by federal standards, will come at an added cost to ratepayers — residential sewer bills have already risen steadily as ALCOSAN invests in this essential infrastructure.
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