MapGeo is a web based application that provides public access to a variety of geographic layers and data including but not limited to parcels, zoning, wetlands, school districts, voting wards and trash routes.

Portsmouth’s GIS Program is responsible for managing the city's geographic information systems (GIS): hardware, software, and applications that allow staff to create, store, manage, access, visualize and use geographic information. The GIS Program staff collaborate with all departments of the city to eliminate redundancy in dataset creation and maintenance and to provide easy access to data for city personnel and officials.

What can you do about stormwater pollution? Think Blue!

Stormwater pollution can come from a variety of sources including vehicles, pets, septic systems, and household hazardous waste. 

Portsmouth Stormwater Annual Reports

• Year 1 Annual MS4 Report 5/1/2018 - 6/30/2019
• Year 2 Annual MS4 Report 7/1/2019 - 6/30/2020

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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: