Cappaert v. United States

Background

Devil’s Hole is a deep limestone pool on land added to Death Valley National Monument by a 1952 presidential proclamation. The pool contains a unique pupfish found nowhere else. The National Park Service managed and restricted access to the site. A nearby 12,000-acre ranch began pumping groundwater in 1968 from the same aquifer feeding the pool, and summer pool levels fell from about 1.2 feet below a marker to nearly 4.0 feet below by 1972. The United States sued to limit the ranch’s pumping and obtained a court order keeping the pool at no more than 3.0 feet below the marker.

Reasoning

The central question was whether the 1952 reservation of Devil’s Hole also reserved enough unappropriated water to preserve the pool’s scientific value. The Court applied the long-standing federal reserved-water doctrine and found the proclamation’s language clearly intended to protect the pool and its rare fish. The Court held that federal reserved water rights vest on the reservation date and are superior to later private appropriators. Because the pool and the wells were hydrologically connected, the United States could protect the pool from groundwater pumping that would harm its scientific purpose. The Court approved the tailored injunction limiting pumping only as needed to preserve the pool.

Real world impact

The decision lets the federal government enforce water limits tied to the purpose of a land reservation, including groundwater when it affects reserved surface water. It confirms federal courts can adjudicate these claims and that state procedures do not alone control reserved federal water rights. Ranching and other nearby water users may face limits when their pumping threatens federal reservation resources.