The aquifer at the site is in the Payson Granite. The hydrogeology of the Payson area has been defined through the development of the site hydrogeologic conceptual model (HCM) based on drilling and testing activities.

The HCM identified three primary hydrologic units in descending order in the Payson Granite: 1) Alluvium/Colluvium, 2) Decomposed Granite/Fractured Granite, and 3) Variably Fractured Granite/Competent Granite. The groundwater flow direction is west.