Ground water is the safest and most reliable water source, usually supplying ample water needing little or no treatment before use.
Ground water is supplied by either water table or artesian wells. Water table wells are either driven, drilled, dug, jetted, or bored; and due to their lack of upper confining layer they are susceptible to surface and near-surface contamination.
Artesian wells are almost exclusively drilled; and as long as the screened interval in the well is within the boundaries of the aquifer, the confining layers help to protect the aquifer from contamination from surface and near surface sources.
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