CSO Public Notification

CSO Public Notification

CSO discharges consist, or likely consist, of untreated or partially treated sewage and waste. Public health officials recommend avoiding contact with water bodies during rainstorms and for 48 hours afterward, as there may be increased health risks due to bacteria or other pollutants associated with urban stormwater runoff or discharges of untreated or partially treated wastewater. 

Click here to view the CSO map which provides near real-time information (5-minute intervals) on CSO activation status, where they occur, how often and how long they occur.


The City’s annual CSO report is posted here. The annual report provides information on the locations of Haverhill's CSOs, a summary of CSO activations and volumes, status and progress of CSO abatement work.

For additional information about CSOs and Haverhill’s CSO Abatement Program, click combined sewer overflows.  To subscribe to CSO alerts click here

To view MassDEP Sewerage Notification Public Portal click here. It will display all reports that have been submitted to the Sewage Notification Data System, and can be accessed by anyone.