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Each year, approximately 9 billion gallons of wastewater overflow into our region’s waterways. Because of that, ALCOSAN is not in compliance with the federal Clean Water Act.
To fix this, ALCOSAN has started a $2 billion, long-term, Clean Water Plan that will reduce the amount of combined sewage overflow by 7 billion gallons per year and eliminate sanitary sewage overflows. To achieve this, ALCOSAN’s plan involves
four major components:
Regionalization - ALCOSAN is working with municipalities to take ownership of trunk sewers and related facilities to create a streamlined collection system.
Plant Expansion - The Clean Water Plan calls for ALCOSAN's Northside plant to expand. This additional capacity will help reduce the number of overflows caused by excess stormwater.
Regional Tunnel System - ALCOSAN will construct a new regional tunnel system made of three new deep tunnels, and related infrastructure, to allow more wastewater to travel to the treatment plant.
GROW/Source Control - ALCOSAN created the Green Revitalization of Our Waterways (GROW) program in an effort to reduce excess water from entering an already overloaded sewer collection system.
Clean Water Plan Timeline
Regionalization
Regionalization will more than double ALCOSAN’s sewer system ownership and maintenance responsibilities in the region.
265
Miles of Sewer
8
Wet weather control facilities
77
Diversion structures
Learn how ALCOSAN is working with municipalities to take ownership of trunk sewers and related facilities to create a streamlined system.
The Clean Water Plan also calls for ALCOSAN's Northside plant to expand. This additional capacity will help reduce the number of overflows caused by excess stormwater.
North-End Expansion, December 2022North-End Expansion, February 2023East Headworks, March 2023Environmental Compliance Facility January 2023Parking Garage, Completed 2022
Follow updates on ALCOSAN’s plant expansion plans.
ALCOSAN will construct a new regional tunnel system, and related infrastructure, to streamline conveyance, or transport of wastewater to the treatment plant. This will help reduce overflows.
Ohio River Tunnel
150+ feet deep, 4.6 miles and 18 feet in diameter, with construction from 2025-2029.
Allegheny River Tunnel
150+ feet deep, 5.4 miles and 18 feet in diameter, to begin construction in 2028 and complete by 2034.
Monongahela River Tunnel
150+ feet deep, 5.3 miles and 18 feet in diameter, with construction from 2030-2036.
Learn about the changes at ALCOSAN that are underway to accommodate flow.
ALCOSAN created the Green Revitalization of Our Waterways (GROW) program in an effort to reduce excess water from entering an already overloaded sewer collection system.
Learn about the changes at ALCOSAN that are underway to accommodate flow.