What causes contamination of our drinking water?



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    Among the commonest sources of drinking water contamination is overflow of raw sewage from disposal facilities or treatment plants.  Sewage overflow occurs in some areas when heavy rains cause sewage containers to spill over and enter the watershed.  Contamination also results from some agricultural processes; pesticides and fertilizers applied to crop fields may eventually be washed into nearby streams.  Similarly, contaminants ranging from lawn fertilizers to car oil are washed into the gutters in urban areas, and end up in rivers and streams. 

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