Combined Sewer Overflow No. 12

This project is complete. CSO 12 was the final project to eliminate combined stormwater and sewer that discharged to CSO #ZZ outfall to the Mascoma River. The project replaced approximately 4,700 feet of Sewer, and 4,300 feet of Water Main and replaced and added over 4,000 feet of Storm Drainage. Most of the Sanitary Sewer was constructed in the 1940s of Vitrified Clay Pipe that was subjected to inflow and infiltration. CSO 12 also added a sidewalk along Mascoma Street to complete the sidewalk connection from Peabody Street to the other side of the bridge over Interstate 89.

You can easily find this page again by going to LebanonNH.gov/CSO12.

 BeforeCSo 12 Before1

AfterCSO 12 After1

  1. Project Information

Project Information

This project is complete with the exception of lawn restoration in the Spring of 2022

Plans and Documents

  1. CSO 12- Construction Schedule 2020
  2. CSO 12 Map of Project Limits (PDF)
  3. CSO 12 100% Plans (PDF 28MB)
  4. CSO 12 Bid Advertisement

General Information

  1. CSO 12 Lawn Restoration

Letters to Residents

  1. SRF Clean Water Environmental Information Legal Notice
  2. CSO 12 Neighborhood Walk Invitation 06/26/18
  3. CSO 12 Informational Meeting 11/15/18
  4. CSO 12 Arborist Walkthrough 12/10/18
  5. CSO 12 Community Meeting Invitation 03/26/19
  6. CSO 12 Project Punch List Letter 06/03/20
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Contact Information


Public Works Department

Main: 603-448-3112

Project Contacts

Jay Cairelli
Assistant Public Works Director
Email Jay Cairelli