Turbidity is a measure of the cloudiness of water. It is used to indicate water quality and filtration effectiveness (such as whether disease-causing organisms are present). Higher turbidity levels are often associated with higher levels of disease-causing microorganisms such as viruses, parasites and some bacteria. These organisms can cause symptoms such as nausea, cramps, diarrhea, and associated headaches.
Sources of impurity: Soil runoff. In Canada, the maximum acceptable concentration for turbidity in drinking water entering the distribution system is 1 NTU (Nephelometric Turbidity Unit). An aesthetic objective of 5 NTU has been set for samples taken in the distribution system. Turbidity levels higher than 5 NTU can indicate severe local corrosion of the water pipes.
Additional notes from Canadian government: CANADA Turbidity – is caused by the presence of suspended matter or particles in the water.
Maine Maximum Exposure Guideline limit:
USA Primary Drinking Water Standard limit: n/a
USA Secondary Drinking Water Standard limit: n/a
Canada Health standard limit:
Canada Aesthetic standard limit:
USA daily recommended allowance: