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Water pollution

Only 3% of the world's water is freshwater.
A proportion of this comes from rivers, which can become heavily polluted downstream.

Most potable (drinking) water needs to be treated for human consumption. Most untreated potable water comes from aquifers, (ground water wells and boreholes) or man-made reservoirs piped to towns.
Point source pollutants are harmful substances emitted directly into the water. Non point sources are difficult to trace as their sources are indirect e.g. rainwater

Contaminated river water causes
many deaths in unregulated rivers
of less developed countries.

How do you think freshwater
becomes polluted?

 Pollution dissolves into the water

 People put pollutants into the water