http://en.wikipedia.org/wiki/Water_quality
In urbanized areas around the world, water purification technology is used in municipal water systems to remove contaminants from the source water (surface water or groundwater) before it is distributed to homes, businesses, schools and other users. Water drawn directly from a stream, lake, or aquifer and that has no treatment will be of uncertain quality.
In urbanized areas around the world, water purification technology is used in municipal water systems to remove contaminants from the source water (surface water or groundwater) before it is distributed to homes, businesses, schools and other users. Water drawn directly from a stream, lake, or aquifer and that has no treatment will be of uncertain quality.
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