Lowell Water Utility
CSO Discharge Alert
NPDES Permit No: MA0100633
Dear Environmental Professionals and Interested Parties:
This report describes discharges of untreated Combined Sewer Overflows (CSOs) currently underway at the Utility's diversion structures. These CSO diversions are an untreated mixture of stormwater and dilute sewage that is discharged into nearby receiving waters when the capacity of the treatment and transport systems are exceeded as a result of heavy rain. These diversions occur only when necessary to reduce risks to public health and safety that would otherwise result from street flooding and property damage. We are constantly working to improve the optimization of our wet-weather treatment program to reduce the volume and frequency of these discharges.
Elevated bacteria concentrations in the Merrimack and Concord rivers are likely to occur as a result of heavy rain. It is advisable that primary contact recreation (swimming) be avoided downstream of Lowell during this time to avoid increased risk of contact with this bacteria. Diversion start time:
(start time at first station to divert)Diversion end time:
("Ongoing", or if over and no further discharges expected, insert end time of last station to cease diversion)Lowell Water Operations Division