Coliform bacteria
Total coliform bacteria are microorganisms that are commonly present in soil, sewage, surface water and very shallow groundwater. E. coli (Escherichia coli) bacteria are a subset of the total coliform group that are found in sewage.
The presence of total coliform and/or E. coli bacteria in drinking water poses a potential health hazard. The presence of these bacteria indicates a possible sanitary defect in the well system, which could allow other harmful contaminants to enter the system.
Your Test Results
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Interpretation
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SAFE or ABSENT
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Total coliform bacteria and E. coli are not found in your water.
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UNSAFE or PRESENT
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Total coliform bacteria were found in your water. E. coli results might not be available depending on what test was done.
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If coliform bacteria are found in your water, do not consume the water without disinfecting first. Boiling the water for at least 1 minute will kill the bacteria. Your well may need to be shock chlorinated or other maintenance may be needed.
How to Shock Chlorinate Your Well