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Types of Aquifers

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Michigan Environmental Education Curriculum
Groundwater Contamination

Aquifers come in two types which are shown below: unconfined and confined.

Unconfined aquifers are those into which water seeps from the ground surface directly above the aquifer.

Confined aquifers are those in which an impermeable dirt/rock layer exists that prevents water from seeping into the aquifer from the ground surface located directly above. Instead, water seeps into confined aquifers from farther away where the impermeable layer doesn't exist.

Which type do think is in more danger of contamination? Which aquifer would you want to drill into for a drinking water well? Answers below.

Unconfined Aquifer Confined Aquifer

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