Water resources in the Tatiara Prescribed Wells Area consist of an unconfined and confined aquifer. The upper unconfined aquifer is recharged through rainfall. A thick clay layer sits under the unconfined aquifer preventing recharge into the confined aquifer and connectivity between the aquifers.

The Tatiara Prescribed Wells Area supports close to 400 water licences. There are over 100 observation wells in the Tatiara Prescribed Wells Area.