10/15/2026
WHAT EXACTLY IS TURBIDITY? We instinctively associate clear water with healthy water. Scientifically, it isn't that simple.
Turbidity describes how suspended particles interfere with light passing through water. Those particles may include clay, silt, fine organic matter, microorganisms and other suspended material.
Some turbidity is entirely natural. Rivers transport sediment, redistribute nutrients and continually respond to rainfall, seasonal flows and changing landscapes.
Concern arises when turbidity becomes excessive, persistent or associated with continuing inputs of material.
Higher turbidity can influence light pe*******on, aquatic vegetation, habitat conditions and the environment experienced by fish and other organisms.
But turbidity alone cannot tell us whether water is contaminated.
Clear water can contain dissolved contaminants. Cloudy water may simply contain natural sediment.
Turbidity therefore isn't a diagnosis. It's evidence.
Understanding what is suspended, where it originated and how it behaves is an important step toward understanding the health of a river.
www.bgpgroup.ca