The following are some of the contaminants and water quality indicators (WQIs) that should be tested in private well water. WQI tests measure the presence of certain germs in water. Although the presence of WQIs does not always lead to illness, testing for them is a straightforward way to check for the presence of sewage and other potentially harmful germs from human or animal waste. Refer to “Water-related Diseases and Contaminants in Private Wells” for a comprehensive list of germs and chemicals that can be found in private well water and the illnesses they may cause.
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