Spokane Valley Rathdrum Prairie Aquifer

The Spokane Valley-Rathdrum Prairie Aquifer is an aquifer located in the U.S. states of Washington and Idaho It is located under the city of Spokane, as well as under the Spokane Valley, and the Rathdrum Prairie. The aquifer contains 10 trillion gallons (38 trillion liters) of water, and is part of the Columbia River Drainage Basin. The only Watercourse that remains above the surface for an extended distance is the Spokane River. The Area surrounding it receives an average of 13–30 inches (33–76 cm) of rain annually. The aquifer is the primary water source for the greater Spokane area, which is home to about 700,000 people.