Save Popponesset Bay is a 501 c 3 all-volunteer organization founded in 1987. Its current mission is to:
- Preserve, protect and restore the Popponesset spit
- Maintain open navigation channels into and out of Nantucket Sound
- Keep the waters in and around Popponesset safe and navigable and preserve and protect the Popponesset Spit as an endangered species habitat and registered barrier beach.
Through generous private donations, SPB is able to take the appropriate actions to ensure the stability of the Spit and navigability of the waters around the Popponesset Bay, including maintaining the required permitting with the federal, state and town authorities, as well as maintaining strong partnerships with like-minded organizations.