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The Public Health Laboratory tests for indicator bacteria called total coliform and E.coli.
Total Coliform: These bacteria are often found in animal waste and sewage, and soil and vegetation. If they are in your drinking water, it means surface water may be entering your well.
E. coli (Escherichia coli). These bacteria are normally found only in the digestive systems of people and animals. If they are in your drinking water, it usually means that animal or human waste is entering your well from a nearby source.
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