Charles River Report Card Drops From A- To B. What Happened To

When it comes to the Charles, a lot depends on the weather. And Massachusetts saw record rainfall last year.

King Charles doing well in hospital after prostate treatment

A watershed moment: How Boston's Charles River went from polluted

Scientific method - Wikipedia

Report cards show progress, problems in Boston-area rivers

EPA report card gives mixed grades for Charles, Mystic and

About the Charles River

The Charles River Initiative

A watershed moment: How Boston's Charles River went from polluted

EPA report card gives mixed grades for Charles, Mystic and

Charles River cleanup improvements 'stalled,' says annual EPA

Charles River - Wikipedia

Water Quality Reports & Data — Charles River Watershed Association

Announcing the 2022 Three Rivers Report Cards — Mystic River

Long-polluted parts of Boston's major rivers continue to fail