Well Abandonment Information
Why are unused and improperly abandoned wells threats to groundwater?
Unused and improperly abandoned wells are a significant threat to
groundwater quality. If not properly filled with impermeable material,
abandoned wells can directly channel contaminated surface or soil water
into groundwater. Water that gets into abandoned wells bypasses the purifying
action that normally takes place in the upper layers of the soil. Because
groundwater flows in soil and bedrock formations (aquifers), contamination
that enters old wells can move to nearby drinking water wells. Many
thousands of improperly abandoned wells are threatening groundwater
in Wisconsin. Whenever you see an old deteriorating windmill in the
countryside, there is likely an improperly abandoned well underneath.