CRWA's Water Quality Notification Program presents the daily flag colors of the river's health, which signify whether or not the river is safe for boating at ten boating locations from Watertown to Boston. Flag colors are based on E. coli and cyanobacteria levels.
CRWA estimates E. coli levels using a model that takes into account a variety of environmental factors including antecedent rainfall and river flow. CRWA collects river samples for bacteria weekly during the summer to verify the model forecast. Cyanobacteria monitoring is conducted at least every two weeks. Read more about the development of CRWA's bacteria prediction model.
Indicate inconclusive data to preclude a possible health risks
Indicate potential health risks
This project is generously funded in part by the Massachusetts Environmental Trust.