Mechanisms
within the organisation may fail and excesses or other materials
enter the sewage system.
Certain
chemicals are persistent and not removed by standard sewage
treatment and enter our drinking water.
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Waste
in landfill breaks down and releases "leachates". These are
compounds that can dissolve in water and "leach" through the
soil.
The
leachates end up in water courses, unless the landfill is
totally insulated from the land..
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