Pease Wastewater Treatment Facility Upgrade

Construction Updated July 15, 2026

Project Overview

This project will upgrade the Pease Wastewater Treatment Facility to address treatment capacity limitations based on projected buildout of the Tradeport for both domestic and industrial customers. Much of the Pease Tradeport WWTF equipment has reached the end of its service life and cannot accommodate the future flows and loads associated with the buildout. Improvements include upgrades to the liquid and solids treatment processes and ancillary systems to address nitrogen removal requirements. The project includes an electrical system upgrade, mechanical equipment replacement, expansion of the secondary treatment capacity and conversion of the effluent disinfection system from chlorination/dechlorination to UV. Construction is anticipated to take approximately 2 years, and the facility will remain in operation throughout construction.

Estimated Completion:   This project is currently in the design phase. Construction is anticipated to take approximately 2 years, and the facility will remain in operation throughout construction. 

Project Budget $25,000,000
Project Team

Staff Contact: Erich Fiedler, City Engineer, 603-766-1421, esfiedler@portsmouthnh.gov, Designer: AECOM, Contractor: TBD

Area of Impact

Project Documents

These preliminary design plans detail the extent of this project, covering site grading and drainage, hydraulics, piping, the electrical plan for the site and five buildings housing facility operations.