News and Updates | Recreational Info | Project Area | Construction Route |Media (YouTube) | Wastewater Home
This project is the largest that the City has undertaken. The Peirce Island Wastewater Treatment Facility (WWTF) upgrade expands treatment at the plant to an advanced secondary process which removes organics and nitrogen. A progress video filmed in March 2017 can be seen here.

For more information on this project:

Donald Song, P.E, Project Manager,

Tel: (603) 610-7305

Terry Desmarais, P.E, City Engineer

Tel: (603) 766-1421
To report an issue, please fill out a Report Form.

Public Meetings

Monthly public meetings with City staff, the Contractor and other officials involved in the project are typically held every third Wednesday each month at 11 a.m. in Council Chambers to ensure that citizens are informed; these meetings are broadcasted and available on the City’s YouTube channel, with presentations and notes available at Wastewater Public Meetings. The month's public meeting is May 24.

The Coming Week

(Current Schedule 05/22/2017 - 05/26/2017)
Anticipated Construction Traffic Volume: High

This work this week will include, but not be limited to:
  • Drilling and blasting for ledge removal for the Biological Aerated Filter Building
  • Perform leak test of the new Sludge Gravity Thickener
  • Installation of interior piping, valves and controls at the new Sanitary Pump Station
  • Installation of yard piping adjacent to the Headworks Building
  • Masonry wall construction at the Headworks Building
  • Interior mechanical, electrical and plumbing work at the Headworks Building
  • Excavation and demolition of existing structures for the new Electric Building
  • Excavation and installation of electrical duct banks
  • Continue to export excavated materials off site
  • Excavation/ledge removal for drainage, storm water quality structure & drainage diversion structure
  • Excavation and preparation for installation of the Mechanic Street force main diversion
  • Four Tree Island erosion control and parking lot reconstruction
  • Grass overflow parking erosion control and drainage installation


Project Factsheet

  • Start Date: September 2016
  • BAF Substantial Completion: December 2019
  • Secondary Permit Compliance: April 2020
  • Project Substantial Completion: May 2020
  • Final Completion: August 2020
  • Design Engineer: AECOM
  • General Contractor: Methuen Construction
  • Design Flow: 6.1 MGD average
  • New Treatment Processes:
    • New Headworks
    • Biologically aerated/anoxic filter (BAF) using the Kruger BioSTYR ™ technology for Secondary Treatment and Nitrogen Removal
    • Rotary screw presses for solids dewatering

News and Updates

Recreational Impact Advisory

State Fish Pier: No restrictions – Open
Public Boat Launch: No restrictions. Open seasonally.
Four Tree Island Parking Lot: Closed for expansion prior to the Outdoor Pool Season.
Four Tree Island : No restrictions - Open.
Off-leash Dog Area: Closed. No dogs allowed on Peirce Island from the bridge.
Peirce Island Outdoor Pool Access: Currently Unrestricted – Open seasonally.

Map of Project Area

Designated Map of Construction Traffic Route

Related YouTube Meetings

To view all the videos in the below playlist, click on the three bar icon on the top left.