CRWA's Water Quality Notification Program uses a system of color-coded flags to indicate whether or not the river is safe for boating at ten boating locations between Watertown and Boston. Flag colors are based on E. coli and cyanobacteria (blue-green algae) levels.
CRWA estimates E. coli bacteria levels using models that take into account a variety of environmental factors including rainfall and river flow. CRWA collects water samples weekly to verify the model forecasts. Cyanobacteria monitoring is conducted at least every two weeks. Read more about the development of CRWA's bacteria prediction model.
Thank you to Benjamen Wetherill of ACASAK Technologies for assistance developing and maintaining this automated system.
Indicate potential health risks