Superfund Site Profile
The 278-acre Portsmouth Naval Shipyard (PNS) site is located in Kittery, Maine. Two-thirds of the site is a high-density industrial area containing 376 buildings. The shipyard is built on Dennet's, Seavey's, Jamaica and Clark's Islands, connected by 90 acres of fill. Filling of the tidal flats gradually took place as the shipyard’s space needs increased. Shipbuilding started in 1690 and PNS became a Navy shipyard in 1800. Currently, the shipyard is used to overhaul nuclear powered attack submarines. Hazardous wastes have been stored, disposed of, spilled, or treated at more than 30 acres on the site. Following immediate actions to protect human health and the environment, site investigations and long-term cleanup planning are ongoing.