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CSO Discharge Map

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The above map identifies the six (6) combined sewer overflow (CSO)outfalls the city currently has active.  Each outfall has a drop down menu that details the individual CSO activation time, termination time, and volume of discharge.

Please be advised the City has a $230 million CSO abatement program ongoing that will eliminate the majority of these discharges over the next 20 years.  For more information please go to EPD’s website  https://www.manchesternh.gov/Departments/Environmental-Protection/CSO