In 1990, Casco Bay was designated an “estuary of national significance” and included in the U.S. Environmental Protection Agency’s National Estuary Program, which was established in 1987 under the Clean Water Act to protect nationally significant estuaries threatened by pollution, development or overuse. As a result of this designation, the Casco Bay Estuary Partnership was formed.

The Casco Bay Estuary Partnership, one of 28 National Estuary Programs nationwide, is a collaborative effort of people and organizations interested in protecting and restoring the Bay. Our partners include local, state and federal government organizations; non-profits; local businesses; citizens; universities and more.

Our activities benefit those that:
• live, work and play on the Bay,
• appreciate its natural beauty, and
• reap its economic benefits.


The Casco Bay Estuary Partnership’s mission is to help conserve the ecological integrity of Casco Bay and its watershed through science, public stewardship and effective management.


The Casco Bay Estuary Partnership is hosted by the University of Southern Maine and located at the Muskie School of Public Service. Our offices are in the Wishcamper Center at 34 Bedford Street in Portland. The Wishcamper Center is a U.S. Green Building Council LEED-certified (Leadership in Energy and Environmental Design) “Gold” building.