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upcoming events

Dec 12
Friends of the Malden River meeting, 6:30-8PM Cambridge Health Alliance, 195 Canal Street, Malden

Jan 3
Committee Meeting, 7-9PM
Tufts University, Tisch College of Citizenship & Public Service, Lincoln Filene Hall, Rabb Room, 10 Upper Campus Road, Medford


As in many urban watersheds, water quality in the Mystic River Watershed is impacted by stormwater runoff, aging stormwater infrastructure and sewer overflows. In addition, the Mystic River and several of its tributaries have a history of industrialization that has left behind heavy metals and other pollutants in the riverbed itself. Below is a list of some of the challenges to and impacts of water quality conditions in the Mystic River Watershed.  



Have you ever wondered if it is safe to swim or boat in the Mystic River? Some days, especially after a heavy rain, a swimming or boating advisory may be issued by the local municipality.

More information on CSO's





Cyanobacteria (cyano=blue-green) are a type of algae found naturally in aquatic and terrestrial environments. Under the right conditions, cyanobacteria can grow rapidly resulting in an algal bloom. Environmental factors such as light, temperature, and nutrients contribute to bloom formation.

MyRWA's Cyanobacteria monitoring program



Mystic River communities have a disproportionate share of cumulative environmental hazards.

Environmental Justice concerns in the Mystic




Are the fish contaminated? Check out the Public Health Fish Advisory to find out more about the health of fish in the Mystic River.

Fish Consumption Advisories





Sanitary sewer overflows, or SSOs, are discharges of raw sewage into surrounding water sources and communities that pose as a substantial public health risk. MyRWA addresses SSOs through data management, advocacy and outreach.

More information on SSO's




Stormwater and Run-off (Non-Point Source Pollution) is a major cause of water pollution in the Mystic River and its tributaries, affecting fisheries, habitat quality, flora and fauna, and the overall beauty of the river.

Non-Point Source pollution




The Mystic River Watershed is home to three EPA sanctioned Superfund sites, or areas of toxic waste. Learn more about Superfund sites and what is being done to clean them up here.

Superfund Sites in the Mystic River Watershed




The Mystic River Watershed hosts many invasive species, or non-native species that negatively impact the ecosystem such as the Water Chestnut. Read more about Water Chestnuts and other invasives. Click this link for the Groundwork Somerville & Americorp Water Chestnut Removal Project details.



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