The Neponset River often
fails to meet state bacterial water quality standards,
except at the river mouth, where river water mixes with
cleaner harbor water. Water quality does not consistently
meet standards near Tenean Beach or the Commercial Point combined sewer overflow treatment facility outfall.
Quality Department manages
water quality data on bacteria, algae,
water clarity, dissolved oxygen, nutrients, and suspended
solids in Boston Harbor and
its tributary rivers.