Well Water - 8 Common Water Problems—and Their Cures - Bob Vila
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Problem: Coliform bacteria, most often found in lakes or wells, normally do not appear in drinking water. But their presence indicates that other disease-causing microbes may be contaminating the water.
Management: Treating bacterial contamination requires a disinfectant method, most commonly chlorination. Consult a trained professional to determine the source of the contamination and to fix the problem.