The new Peirce Island Wastewater Treatment Facility hosted a ribbon-cutting in July 2021 with EPA and other State and local officials and project contractors participating. As intended, this project significantly increased the level of wastewater treatment provided at the facility, resulting in improved effluent discharged to the Piscataqua River. The upgrade included the installation of new headworks, rotary screw presses for solids dewatering and an advanced secondary biological treatment process which removes organics and nitrogen.

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The City of Portsmouth is a regional provider of wastewater collection and treatment services to the City of Portsmouth, Town of New Castle and portions of the Towns of Greenland and Rye. The City has two wastewater collection systems that convey wastewater to separate wastewater treatment facilities (WWTF) at the Peirce Island WWTF and the Pease International Tradeport WWTF. The collection systems for the Pierce Island WWTF and Pease International Tradeport WWTF are shown in the figure below and services downtown Portsmouth and the client communities.

Wastewater pumping stations are necessary in a sewer collection system to lift wastewater from low elevations in the system to a higher elevation in the system as it is conveyed toward a treatment facility. The City has 20 wastewater pumping stations: 19 located within the Peirce Island WWTF Collection System and one located within the Pease WWTF Collection System.