Long Term Control Plan

The Long Term Control Plan is a plan to significantly improve the water quality of the Presumpscot River through a reduction of combined sewer overflows (CSOs).  The plan goes through 5-year cycles, with the current one ending in 2028.

PWD & Westbrook CSO Master Plan Update

Short Term Goals

• Reduce surcharging at the siphon structure that is contributing to discharges at CSO 002, 003 and 004.
• Complete additional flow metering and sewer investigations at CSOs 007 and 008 to better understand the sewer system hydraulics at these two locations and confirm if additional CSO abatement work is needed to facilitate their eventual closure.
• Complete supplemental sanitary sewer flow metering and I/I investigations in the sewers tributary to the siphon and the Cottage Place Pump Station to identify and isolate sources of extraneous flow that effectively occupy a significant portion of the existing sanitary sewer system's capacity at times.

Long Term Goals

• Complete strategic I/I source elimination projects in the sewers tributary to the siphon and the Cottage Place Pump Station over the next CSO Master Plan cycles to cost-effectively recapture existing sanitary sewer system capacity that is temporarily lost to excess I/I entering the sanitary sewers during wet weather.
• Reduce CSO discharges to comply with National CSO Control Policy.  This could result in closure or conversion of remaining CSOs, or reduction in overflow events to comply with guidelines in National CSO Control Policy.