USGS Washington Water Science Center
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The Spokane Valley/Rathdrum Prairie aquifer, which extends across Idaho and Washington, is the sole source of drinking water for more than 450,000 people. Recently submitted water-rights requests would substantially increase withdrawals from the aquifer. The public and state resource management agencies need an improved understanding of the SVRP hydrologic system in order to ensure appropriate management and protection of this valuable resource. In close cooperation with water-resource agencies and stakeholders from Idaho and Washington, the USGS is conducting a major study of the aquifer to provide current, complete scientific information for making good decisions about managing this important aquifer.