Revised On: Feb. 15, 2024 - 12:30 p.m.

Groundwater is generally found in interconnected, unconfined aquifers of the Fort Lowell Formation, Tinaja beds, and Pantano Formation. Recharge to the aquifers is primarily from precipitation adjacent to the mountains and along major streams or through underflow from adjacent basins. General groundwater flow across the former Sahuarita Air Force Range Formerly Used Defense Site is assumed to be to the north-northwest, while closer to the Santa Cruz River, flow is westerly.