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Water Pollution. Water Water everywhere and not a drop to drink. Canada has the 2 nd best water-quality among industrialized countries and one of the safest in the world Water is never “pure” as it picks up anything it comes into contact with

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water pollution

Water Pollution

Water Water everywhere and not a drop to drink

slide2

Canada has the 2nd best water-quality among industrialized countries and one of the safest in the world

Water is never “pure” as it picks up anything it comes into contact with

How good our drinking water is depends on where it originates from, how it is treated and how it is distributed

slide3

70% of Canadian’s water – municipal treatment plants

30% of Canadian’s water – groundwater

Canada – lots of geographical diversity, therefore lots of variation in the quality of the source water

water quality impacted by
Water Quality Impacted By

2 impacts

  • Natural
    • Wildlife
    • Geological formations
  • Artificial
    • Agriculture
    • Mining
    • Municipal Waste Water
greatest risk to water quality
Greatest Risk to Water Quality

Greatest Risk: Microorganisms

Bacteria – cyanobacteria, E. coli

Protozoa - cryptosporidium

Viruses

Smaller Risk: Chemical Substances

Metals – lead, chromium, copper, arsenic

Inorganic substances – nitrates, fluoride

Organic chemicals – pesticides, benzene

DPBs (disinfection by-products) – trihalomethanes (THMs), halocetic acids (HAAs), chloroform

water treatment
Water Treatment

Most important treatment for drinking water is disinfection

Chlorine commonly used

Disinfects have (mostly) eliminated waterborne diseases

preventing pollution multi barrier approach
Preventing PollutionMulti-Barrier Approach
  • Puts barriers in place that eliminate or minimize the threats
  • Recognizes that each barrier may not remove or prevent contamination but together provide greater security for public health
  • Barriers include
    • Selecting best drinking water source (e.g. lake, river, aquifer)
    • Protecting water from contamination
    • Using appropriate and effective water treatment
    • Maintaining water quality as distributed