Department of Public Works, 680 Peverly Hill Rd, Portsmouth, NH 03801 Phone: (603) 427-1530, Fax: (603) 427-1539 | Contact Us |


Welcome to the stormwater section, this section is intended to help you understand the importance of stormwater and what can cause stormwater pollution. Please refer to the following link for more information.

The City of Portsmouth is part of four watersheds.

When it rains, or snow melts or water flows into Portsmouth's stormwater system, it will ultimately make its way [or flow] and discharge into one of the following watersheds (arrows indicate direction of flow).

  • 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, cigarette butts and other pollutants. Many times, rainfall events result in the closure of clam beds for 48 hours or more.