The formation through which it slowly flows is called an aquifer. The top of the water-saturated zone is the water table, and water percolating down to it is called recharge. Recent surveys by Idaho water quality specialists have found trace amounts of nitrates and, in some cases, pesticides in the drinking water. Nitrates can get into drinking water from many sources, but poor management practices can cause pesticide contamination. Pesticides can get into groundwater through agricultural, industrial, and homeowner uses as well as spills and improper disposal.
Contaminated water is difficult and expensive to manage once it becomes dispersed underground.
Careful pesticide application practices will protect the groundwater and help to ensure personal and public safety. Choose a pesticide that is least likely to leach into groundwater or to runoff and contaminate surface water. Read and follow the label directions for the pesticides used. Protect water sources from contamination while mixing and loading pesticides. Calibrate application properly and avoid over-spraying or drift.