My Aquifer > Groundwater Basics > Where does the water we drink come from?
The southern Bannock Range supplies most of the aquifer's recharge from the areas of greatest average annual snowpack in the Mink Creek and Gibson Jack Creek watersheds (Figure 9). The remainder of the aquifer's known water supply originates from ground water flowing through the Portneuf Gap. Very little is thought to originate from leakage out of the Portneuf River.
Figure 10 shows locations of municipal water supply wells used to withdraw ground water from the aquifer, together with the locations of storage tanks and the approximate areas of the city served by different parts of the well field.