The treatment process consists of a series of steps. First, source water is drawn from the Bellamy Reservoir. Prior to mixing, coagulation chemicals are added. The addition of these substances cause small particles to adhere to one another (called floc), making them easier to float to the surface in the Dissolved Air Flotation (DAF) system, where they are skimmed off and sent to a drying bed. The water is then filtered through layers of anthracite to remove smaller suspended particles and turbidity (which is a measure of the cloudiness of the water).

The Water Division performs the following functions for the communities served by the Portsmouth regional water system that include Portsmouth, Pease Tradeport, Newington, New Castle, Greenland and portions of Rye and Madbury:

BILLING INQUIRIES

Water Billing Office Location: City Hall Building, 1 Junkins Avenue, Room 304

Billing Office Hours:

• Monday 8:00am - 6:00pm
• Tuesday through Thursday 8:00am - 4:30pm
• Friday 8:00am to 1:00pm

Billing Office telephone number: (603) 610-7248 or (603) 610-7237

Planning, engineering and regulatory documents for the Peirce Island WWTF, the Pease Tradeport WWTF and the collection system are available on this page.  You can also find below the 2014 Independent Peer Review Report relative to nitrogen in the Estuary and other water quality related documents.

Click links below to quickly move to each section:

Go to a 10-Year History Timeline on Portsmouth's PFAS Treatment Efforts, 2014-2024

Pease Water Treatment System Update Presentation - September 14, 2021 for the Pease Restoration Advisory Board

Water Quality and Response to PFAS Com

The Peirce Island WWTF (Fact Sheet) is the larger of the City’s two treatment facilities and is located on Peirce Island.