My Aquifer > For Private Well Owners > How can my well become contaminated?


Your well may become bacteriologically contaminated in one or more of the following ways:

1. The well may not have a vermin-proof cap, allowing insects that carry bacteria to enter the well.

2. There is a source of contamination, such as a septic system, too close to the well or the well casing isn't deep enough to assure that recharge water receives sufficient filtration to remove bacteria.

3. The well may be constructed using poor sanitary practices. New wells often show contamination because:

Note The state well code requires disinfection of new wells, pumping equipment and water systems prior to use.

4. Contaminated surface water or groundwater can enter an improperly constructed well in the following ways: