Peirce Island Wastewater Facility Upgrade Project

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. Progress videos are available on our YouTube page, shown below.



Project Contact

Terry Desmarais

Terry Desmarais

P.E, City Engineer
(603) 766-1421

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 City Hall's Conference Room A 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


Anticipated Construction Traffic Volume: Moderate

Week of April 6, 2020 - work will include, but is not limited to:

  • Continue electrical, plumbing, and HVAC activities in the Solids Building, BAF Building, and Gravity Thickeners
  • Continue painting in the Grit Building, Solids Building, and BAF Building
  • Continue startup of the BAF process
  • Continue architectural, mechanical, electrical, plumbing, and HVAC activities in the Grit Building 
  • Continue structural modifications for the new Operations / Lab Building
  • Continue installation of the new Gravity Thickener mechanism



State Fish Pier: No restrictions – Open

Public Boat Launch: No restrictions. Open seasonally.

Four Tree Island Parking Lot: Open. 

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


Map of Peirce Island Project Area


Designated Map of Construction Traffic Route


Designated Map of Construction Traffic Route