Allegheny County Sanitary Authority (ALCOSAN)

Regional Sanitary Authority

Appears in 1 story · Last updated Oct 25, 2026

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ALCOSAN breaks ground on $1 billion Ohio River Tunnel

Built World

Owner and operator of the Clean Water Plan

For decades, heavy rain in Pittsburgh has pushed untreated sewage into the Ohio, Allegheny and Monongahela rivers. On Oct. 22, the Allegheny County Sanitary Authority broke ground on a $1 billion tunnel meant to change that.

Updated Oct 25