Welcome to the Stormwater Information Center
What is Stormwater?
"Blue"* is the City's mascot for clean water and advocate for stormwater contamination reduction efforts the City, residents and private property owners can make to keep the Portsmouth watershed healthy.
Stormwater is water from rain or melting snow/ice that doesn't soak into the ground. Roofs, driveways, lawns and other streetscapes and landscapes can produce stormwater. Unmanaged, stormwater can be a bad thing.
Where does Portsmouth's stormwater go?
When it rains, or snow melts or water flows into Portsmouth's stormwater system. From there, stormwater make its way into one of four key watersheds:
Portsmouth Harbor Watershed
Berry's Brook-Rye Harbor Watershed
Winnicut River Watershed
Great Bay Watershed
As storm water flows (or snow melts, etc.), it picks up debris, chemicals - such as fertilizers and pesticides - dirt, pet waste, trash including plastics, cigarette butts and other pollutants and even bacteria. Many times, rainfall events result in the closure of local clam beds for 48 hours or more.
Stormwater can cause or aggravate problems including flooding, erosion and water pollution.
And while the City takes steps to reduce and direct stormwater, private property owners are responsible for about 71% of all the land that collects stormwater, so individual efforts are key to managing the problem.
Learn more about the History of Stormwater Management in Portsmouth.
- What is Stormwater -- A Portsmouth Overview
- Stormwater Permit Requirements
- Mapping stormwater flow and outfalls .
- Portsmouth's Stormwater Operations
- Stormwater Management for Private Property -- Outreach efforts The City owns just 23% of all land in Portsmouth.
- Research and field work
For a slideshow presentation of the current City of Portsmouth Stormwater Management effort, click here.
*Blue was designed by Portsmouth High School student Jane Almeida.
Think Blue Stormwater Videos
Portsmouth 400 for the 400th Tree Planting GuideJanuary 10, 2023
Portsmouth 400 for the 400th Tree Planting Guide