Supreme Court Declines to Review Ninth Circuit Decision Applying Federal Reserved Water Rights Doctrine to Groundwater

The 2012-2016 drought in California and parts of other western states may have ended, but availability of water will continue to present issues for Congress to consider. While state, rather than federal , law typically governs allocations of water resources within a state , there are exceptions where federal law does affect water allocation. Thefederal reserved water rights doctrine, for example, holds that when the federal government reserves federal lands for a particular purpose (such as for a tribal reservation or national monument ) , it impliedly reserves a right to water necessary to accomplish the purposes for which the reservation was created . Si nce 1908, when the Supreme Court established the doctrine in Winters v. United States, courts have applied it to surface waters; a March 2017 decision of the U.S. Court of Appeals for the Ninth Circuit (Ninth Circuit) held, apparently for the first time, that the doctrine can encompass groundwater as well. On November 27, 2017, the Supreme Court declined to review this decision, which thus, for now, sets a potentially important precedent within the Ninth Circuit for other groundwater resource issues and disputes.