Coliform bacteria is a common contaminant in many water supplies. Public water supplies treat for this condition daily with chlorine. In fact, the most common contaminant found in untreated well water is coliform bacteria. Most are not harmful if they are present at low levels. However, certain types such as E-coli or fecal coiform, should not be present even at low levels.
Annual chlorination is recommended for private wells.
There are other treatment methods available, such as continuous chlorine injection or UV treatment. See our section in the main menu devoted to Water Treatment. My pH Does Not Conform To Standards. The pH is a measurement of the acidity of water. The lower the pH, the more acidic the water.