Sewer Department


The Sewer Commission was established by an Act of the State Legislature in 1962. The Commission is responsible for establishing and implementing the policies which manage the Town's sewage collection system and wastewater treatment plant. The Waste Water Treatment Plant (WWTP) is currently operated by United Water. The WWTP is continuing to produce a high quality effluent utilizing its innovative membrane technology. Some of the responsibilities the Cohasset Sewer Commission has is to respond to concerns and complaints, review the operation of the treatment plant and collection systems, and tracking budgetary issues and future planning. 


The Sewer Commission is responsible for, but not limited to, the following:
  • Inspection of all pipeline installation related to new construction
  • Reviewing applications for sewage connections
  • Testing and treating a maximum daily flow of 450,000 gallons of wastewater
  • Diagnosis of residential sewer issues as they arise, along with the rectification of all such problems related to connection to the system
  • Schedule and carry out routine scheduled inspections, clean outs, and testing of the 60 miles of pipeline and 10 pumping stations throughout Cohasset
  • Maintenance, upkeep, and repair of all Sewer Department equipment, including the entire Treatment Plant facility

Forms & Documents