An official website of the Commonwealth of Massachusetts

Massachusetts Bays National Estuary Partnership (MASSBAYS)

MassBays is an EPA National Estuary Program dedicated to protecting, restoring, and enhancing the estuarine resources of Ipswich Bay, Massachusetts Bay, and Cape Cod Bay.

Find out more...

Who we serve

Established as a National Estuary Program in 1990, the MassBays region covers more than 1000 miles of coastline, from the tip of Cape Cod Bay to the New Hampshire border, and serves 50 coastal communities. MassBays has teamed up with five partnering organizations to host regional coordinators who provide technical support to communities in five coastal subregions: Upper North Shore, Lower North Shore, Metro Boston, South Shore, and Cape Cod.

We also provide hands-on support and guidance to community-based monitoring groups, through our Monitoring Coordinators' Network.

MassBays' Healthy Estuaries Grant Program supports monitoring and research focused on the Bays, especially to fill gaps in data and our understanding of coastal habitats and ecosystems.

Keep up to date through our e-newsletters!

Zoom Into the Estuaries

Find out more about the coastal ecosystems of MassBays, and how human activities are shaping their future through this Story Map.


The EPA National Estuary Program

The EPA National Estuary Program (NEP) was established under Section 320 of the Clean Water Act to protect and restore the water quality and ecological integrity of estuaries of national significance. There are currently 28 estuaries from around the U.S. in this program. To learn more about the NEPs visit the NEP Story Map; click here to see MassBays' contribution to the national story.


Recent news & announcements


Take a Science Walk! 

6/27/2021 Massachusetts Bays National Estuary Partnership

The MassBays Science Walk will resume in Spring 2022!


MassBays Science Forum: Investigating and Responding to Hypoxia in Cape Cod Bay 

10/14/2021 Massachusetts Bays National Estuary Partnership

Scientists and managers convene to discuss how to address this threat to coastal habitat and vulnerable fisheries


Related organizations

Image credits:  Salem Sound (N. Moreno)