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Massachusetts · Greater Boston

Charles River
water quality.

Explore water-quality context for the Charles River from the western suburbs through Boston Harbor.

RouteWatertown → Boston HarborPublic sourceCharles River Watershed Association

What you can explore

Open the interactive Rivistry dashboard to view available measurements, station context, historical charts, reference lines, and recent weekly highlights for Charles River.

Open Charles River dashboard

Read the context

River measurements can vary with season, rainfall, temperature, flow, sampling location, and method. Rivistry presents them as evidence to understand and investigate—not as a standalone safety determination.

For the original monitoring information, visit Charles River Watershed Association.

Keep following changes

Weekly River Updates compare new observations with previous readings, recent baselines, trends, and applicable reference values.

See Weekly River Updates →