About Us


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.

Casco Bay Estuary Partnership works as a catalyst for action with the goal of keeping Casco Bay and our nearly 1,000 square miles of watershed clean and healthy.

Our activities benefit those that:

Live, work and play on the Bay

Appreciate its natural beauty

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.