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ALCOSAN Draft Wet Weather Plan

On January 23, 2008, ALCOSAN became party to a Consent Decree (CD) issued by the Federal Court in Pittsburgh on behalf of the US Environmental Protection Agency (EPA), PA Department of Environmental Protection (DEP) and the Allegheny County Health Department (ACHD). CDs have been issued to municipalities across the nation to comply with objectives set by the federal Clean Water Act and Combined Sewer Overflow Control Policy, as well as state laws and local regulations. Their purpose is to improve water quality in receiving waters and protect designated waterway uses that include drinking water, recreation, aquatic life, and others.

The CD was the result of seven years of negotiations and compromise. The primary requirements for meeting compliance are to eliminate Sanitary Sewer Overflows (SSOs) and control the amount of Combined Sewer Overflows (CSOs) being discharged into the Ohio, Allegheny and Monongahela rivers, and their tributary streams of Chartiers Creek, Saw Mill Run, and Turtle Creek. ALCOSAN’s mandate is to:

  • develop a Wet Weather Plan that identifies wastewater 
    infrastructure needs through 2046;
  • describe actions and facilities needed to meet the 
    requirements of the CD; and
  • provide a schedule to complete and operate all
    improvements by September 30, 2026.

The Wet Weather Plan
Released for public review and comment on July 31, 2012, ALCOSAN's draft Wet Weather Plan (WWP) is the culmination of more than 10 years of research, collaboration and analysis.  It provides a blueprint  on how the region will adress federal regulations for sewer overflows and represents what will be the largest capital infrastructure project in the region's history.  The Plan may be viewed in its entirety here, and is also available for review at each municipality's adminstrative offices and at all Carnegie Library of Pittsburgh branches.  Due to the size and technical content of the WWP document, ALCOSAN has also created a WWP Companion Document that provides an easy-to-read summary of the Plan and how it was generated. 

Public Meetings / Comment Period
The designated public comment period for the WWP was July 31 to October 19, 2012.  During this period, ALCOSAN hosted a series of public meetings throughout the service area to present the Plan and accept both written and oral comments from the public and customer municipalities.   Comments that were received through the period will be submitted with the final version of the Plan to be given to the regulatory agencies by January 30, 2013. 

ALCOSAN Act 537 Plan Special Study
A supplement to ALCOSAN's 1996 Act 537 Sewage Facilities Plan, this document reflects the authority's current strategy for the expansion of wet weather treatment capacity at the Woods Run Treatment Plant.

Act 537 Plan Special Study












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Pittsburgh, PA 15233
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