Turbidity is an index of cloudiness of water. It measures the scattering of light caused by fine particles in our waterways. Turbid water with high turbidity can be caused by heavy rainfall, disturbance of the riverbed or bank by heavy machinery or through direct discharges. Turbidity is generally measured in nephelometric turbidity units (NTU), or formazin nephelometric units (FNU).

View a factsheet on Water Clarity