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There can be coliform bacteria in well water when the well is defective. Drinking water should not contain any presence of coliform bacteria for safety reasons, explains the Vermont Department of Health. If coliform bact... More »

While many types of coliform bacteria present in well water are harmless, dangerous coliform bacteria cause fever, diarrhea, abdominal cramps and other forms of gastrointestinal upset, according to Penn State College of ... More »

Bleach is the suggested method for killing coliform bacteria, which seeps into wells from soil and surface water, according to PennState Extension. Testing water and follow-up prevention is recommended to keep coliform f... More »

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Fecal coliform are bacteria that can cause hepatitis, dysentery, cholera, ear infection and typhoid fever, according to the North Dakota Department of Health. The bacteria are commonly found in natural bodies of water, n... More »

While many types of coliform bacteria present in well water are harmless, dangerous coliform bacteria cause fever, diarrhea, abdominal cramps and other forms of gastrointestinal upset, according to Penn State College of ... More »

To treat well water with bleach, use a pump to clear the well of any dirty or cloudy water, and then add chlorine bleach to the well. This bleach is not found in the supermarket and must obtained from a professional who ... More »

A sulfur smell in well water often indicates bacteria growing in the water. Owners should stop using the water until the problem is corrected, as bacteria is potentially harmful. A musty, earthy or fishy odor sometimes i... More »