A court test of federal water law by the Agua Caliente Band of Cahuilla Indians has implications for the American West.

Photo © Brent Stirton/Reportage by Getty Images for Circle of Blue

A groundwater recharge facility for the Coachella Valley adds water imported from the Colorado River to the valley’s main aquifer and prevents the land from sinking and damaging the surrounding infrastructure.

By Brett Walton

Circle of Blue

As California implements a landmark law to balance demand for groundwater with available supplies, an Indian tribe’s lawsuit in federal court has the potential to add new layers of complexity to managing a prized resource that is in short supply during California’s worst ever drought.

The Agua Caliente Band of Cahuilla Indians filed the suit on May 14, 2013 against the Coachella Valley Water District and the Desert Water Agency, two water suppliers in the tribe’s southern California desert region near Palm Springs. The case, straightforward in its goals, addresses two primary concerns: halting groundwater levels that have declined at an average rate of more than one meter per year since 2000, and stemming pollution in the groundwater beneath the 12,545-hectare (31,000-acre) reservation.

I believe you can’t have groundwater management unless you have tribal participation.” –Anecita Agustinez, tribal policy advisor

California Department of Water Resources

The Agua Caliente complaint reflects the growing willingness of Indian tribes across the American West to pursue, by court action or negotiated settlements, clear legal recognition of water rights that are held in trust by the U.S. government. The flexing of tribal legal muscle, which occurred first for surface water rights in the 1980s, has now expanded to seeking more authority over the use of groundwater. The result of these actions is that a new era of water management in the West is taking shape, one in which the old brokers — the cities, counties, and irrigation districts — will have to make room for another seat at the table.

Just like the tribal lawsuit, California’s 2014 law to fortify supplies and improve distribution of groundwater was prompted by rapidly diminishing aquifers and inadequate authority by local or state officials to curtail indiscriminate use. The convergence of the new state law and the federal lawsuit, along with helping to clarify who in California has access to and control of groundwater, has other wide-ranging implications. The Agua Caliente case could be a model for tribes in California that seek greater influence in water management decisions. And the tribe’s suit could set a precedent for how groundwater rights for Indian tribes are interpreted nationally.

Some see the case, now in the Ninth Circuit Court of Appeals, eventually reaching the U.S. Supreme Court. “The lawsuit is very significant,” Anecita Agustinez, tribal policy advisor for the California Department of Water Resources, told Circle of Blue, explaining that the case could prompt other tribes in California to file claims to groundwater. “I believe you can’t have groundwater management unless you have tribal participation. They live on significant rivers and watersheds.”

Tribes Pursue Water Rights

California is an important legal testing ground. The state is home to more than 100 federally recognized Indian tribes, from the Karuk reservation near Oregon to the Campo reservation on the Mexican border. The Agua Caliente is perhaps the first in the state to seek official recognition and quantification of its legal rights to groundwater. The tribe, by suing for its rights, wants a greater say in how water is managed in the valley.

“These practices are not acceptable for long-term health and viability of the Coachella Valley water supply,” Tribal Chairman Jeff Grubbe said in a statement in March, referring to the shrinking aquifer and decline in water quality. “We called out this detrimental practice and brought it to the attention of the water districts over and over for years simply to be ignored.”

The Lawsuit

The Agua Caliente lawsuit covers a few exacting points of jurisprudence — legal ownership, for example, of the space between soil particles that could be used for storing water underground. But the lawsuit makes two broad claims about water quantity and quality that could rebalance current management practices in the region and state.

The first claim is that the tribe has a federal reserved right to groundwater from two basins beneath the Coachella Valley. A federal reserved right was established in the seminal 1908 Winters decision in the U.S. Supreme Court, which found that the U.S. government, by establishing a reservation, implicitly set aside enough water for the tribe to make a living from the land. On March 20, 2015, the U.S. District Court of the Central District of California ruled that the Agua Caliente do have a reserved right to groundwater. An appeal of that ruling is being heard by the Ninth Circuit.

The second broad claim is that the valley’s two water agencies — Coachella Valley Water District and Desert Water Agency — are polluting the aquifer with imported Colorado River water, which is saltier than the local sources. The agencies pour Colorado River water, which is delivered by canals, into sandy-bottomed percolation basins throughout the valley to bolster sagging groundwater levels. The agencies acknowledge that the Colorado River supplies are saltier but do not admit that the practice of recharging the aquifer has increased its salinity. The Agua Caliente argue that their groundwater rights entitle them to water without added salts. This claim is being litigated in a second phase of the lawsuit.

A third phase of the lawsuit will consider numbers: How much groundwater do the Agua Caliente own? Do they have a right to water of a certain quality? What should the standard be? Only phase one — the determination that the tribe does indeed have a right to groundwater – has been completed by the district court.

Local and State Implications

The lawsuit makes the Coachella Valley water agencies nervous. The changes that are in store if the Agua Caliente are granted rights to a significant portion of the aquifer could be substantial.