News and Updates | Recreational Info | Project Area | Construction Route |Media (YouTube) | Wastewater Home
The City of Portsmouth’s (WWTF) is underway! The project is the largest that the City has undertaken, aPeirce Island Wastewater Treatment Facilitynd expands treatment at the plant to an advanced secondary process which removes organics and nitrogen.
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 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 next public meeting is April 19. A project update will also be provided to the City Council on Monday, April 3, 2017.

The Coming Week

(Current Schedule 03/20/2017 - 03/24/2017)
Anticipated Construction Traffic Volume: High

This work this week will include, but not be limited to:
  • Peirce Island bridge force main work(one lane available at times)
  • Blasting and installation of yard piping
  • Concrete work for the construction of Headworks Building
  • Test pits at various locations in the plant in preparation for future work
  • Installation of water and sewer piping around perimeter of the plant
  • Demolition of Filter Building
  • Removal of demolition material
  • Concrete work for gravity thickener


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: Open. Expansion planned for Spring 2017. Additional notice will be provided at a later date.
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.