Welcome to the Cape Cod Water Quality Data Portal

The Cape Cod Water Quality Data Portal is a map-based viewer that allows users to explore freshwater and marine water quality data compiled by the Cape Cod Commission for our regional partners. Data and trends can be viewed by monitoring site, pond, or embayment.

Marine Water Portal

Discover marine water quality data and analyze trends for multiple characteristics at hundreds of monitoring stations across Cape Cod.

Freshwater Portal

Explore freshwater pond water quality data and analyze trends for more than 240 monitored ponds on Cape Cod.

This resource is a compilation of Cape Cod's water quality monitoring data that is collected by several organizations and numerous volunteers throughout the region. These organizations have generously shared the data with the Cape Cod Commission for inclusion in the centralized database accessed by this portal. This portal is intended for data exploration and preliminary water quality temporal trend analysis. This portal displays the data as provided by project partners and applies statistical analysis without making judgements or recommendations. Users are responsible for understanding the appropriate uses and limitations of the data contained therein. Data has been provided by the Buzzards Bay Coalition, the Center for Coastal Studies, the towns of Barnstable County, the Waquoit Bay National Estuary Research Reserve, the Mashpee Wampanoag Nation, the National Park Service, and the Association to Preserve Cape Cod. Portal development was funded by Barnstable County and a Southeast New England Program Watershed Grant awarded to the Cape Cod Commission and its partner agencies.