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When it comes to the Charles, a lot depends on the weather. And Massachusetts saw record rainfall last year.
The Charles River Initiative
Water quality grades are in for Boston-area rivers: How did the Charles, Mystic and Neponset score?
Our Story — Charles River Watershed Association
Boston River Report Cards Show Widespread Improvements in Bacteria Concentrations and Remaining Localized Challenges
Long-polluted parts of Boston's major rivers continue to fail EPA's water quality 'report card' - The Boston Globe
Mystic River Watershed Report Cards
2021 Charles River Report Card — Charles River Watershed Association
Global water resources and the role of groundwater in a resilient water future
Charles River cleanup improvements 'stalled,' says annual EPA report card
EPA report card gives mixed grades for Charles, Mystic and
Charles - Science in the News
Charles River - Wikipedia
The grades are in–see how water quality fared in your favorite section of the Charles River! — Charles River Watershed Association