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CSO Control Program Annual Progress Reports
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Below is the most recent CSO Control Program Annual Report and an archive of past reports.

Visit the MWRA CSO Main Page for more information about Combined Sewer Overflows and efforts to control them in Boston, Brookline, Cambridge, Chelsea and Somerville.

Reports all reports below are PDF format.

cso annual report Current Report

CSO Control Program Annual Progress Report for 2015

Released March, 2016

2014 | 2013 | 2012 | 2011 |2010 | 2009| 2008| 2007| 2006 | 2005| 2004

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PDF Files on this page require Adobe Acrobat Reader® (free download).

Updated April 5, 2016