Sewer Commission Office


Michelle Leary
Administrative Assistant
781.383.4100 x 114
Contact by EMail

Department Personnel

Contact Information

Town Hall
41 Highland Avenue
Cohasset, MA 02025

Phone: 781-383-4108 Ext 114
Fax: (781) 383-1561

Business Hours

Monday, Wednesday, Thursday: 8:30am - 4:30pm

Tuesday: 8:30am - 7:00pm

Friday: 8:30am - 1:00pm



Description and Mission of the 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. 


Recent Awards:


  • The Cohasset Sewer Commission is proud to announce that the Department of Environmental Protection has recognized Cohasset as the recipient of the 2013 Award of Excellence for Treatment Plant Performance.  The Sewer Commission would like to recognize United Water and Coughlin Environmental Services for continuing to adhere to the high quality standards we expect from our partners in operations.







 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 sixty miles of pipeline and ten pumping stations throughout Cohasset
  • Maintenance, upkeep, and repair of all Sewer Department equipment, including the entire Treatment Plant facility



Information about the Waste Water Treatment Facility and Sewer Commission: