Pache.co Information Technologies

As California endures water restrictions due to widespread drought, a proposed $2.5-billion reservoir expansion project in Santa Clara County promises to increase the amount of freshwater for more than a million people.

But a group of environmentalists and landowners claim in a lawsuit filed earlier this month that the local water district did not conduct the necessary environmental studies to determine how the project planned near Pacheco Pass would affect the region’s wildlife and undeveloped land.

The coalition, which includes local residents, ranch owners and the Sierra Club, argues in its lawsuit filed in Santa Clara County Superior Court that the proposed project is “environmentally destructive, high-cost and high-risk” and would affect wildlife habitat, cultural sites and other historic sites.

The Pacheco Reservoir sits in eastern Santa Clara County. The artificial lake can currently hold approximately 5,500 acre-feet of water, but under the proposed expansion, that capacity would increase to 140,000 acre-feet of water, according to the Santa Clara Valley Water District, which is based in San Jose.

The Sites Reservoir plan would flood a bucolic valley north of Sacramento. Environmentalists say it would do little to solve California’s water woes.

Last June, the water district’s board of directors declared a water shortage emergency due to a county reservoir being drained to reduce earthquake risks.

Approximately 97% of California is experiencing severe drought, according to the latest report from the U.S. Drought Monitor at the University of Nebraska-Lincoln.

The lawsuit filed against the Santa Clara Valley Water District arrives as the project is in the planning phase. Construction is scheduled for 2024 and would be completed by 2032, but it’s unclear how the recent lawsuit would affect the timeline.

The Stop the Pacheco Dam Coalition, the group that filed the lawsuit, argues the water district did not study how the project would affect the local wildlife, cultural and historic sites or how the construction — with all its new infrastructure — would affect the area. Up to 1,500 acres of land would be flooded once completed and the new reservoir would be 25 times larger than the existing dam, according to the group’s lawsuit.

The federal government is telling seven states to make plans for drastically cutting water use along the Colorado River within two months.

The water district exempted the project from a review report to determine how geological surveys, including drilling, boring and other tests, would affect the local area, the group said in its complaint.

The district proposes to make 226 borings and dig 57 test pits into the Earth across 2,500 cubic yards, according to the project description. There’s also concern over construction vehicles and helicopters that will be used by contractors during the test phase that could disturb vegetation, plants and wildlife in the area, according to the lawsuit. The group filed its writ of mandate in court on June 2 and is represented by Osha Meserve from the law firm Soluri Meserve.

They’re asking a court to temporarily block the district from moving forward with the project and order that it comply with the California Environmental Quality Act by conducting further environmental studies.

Matter Keller, spokesperson for the water district, said when the project is complete, the expanded reservoir would help the federally threatened South-Central California Coast Steelhead trout. The agency says the project could supply up to 1.4 million residents with water for a year during an emergency.

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In a statement, Keller said: “Valley Water has complied with all environmental requirements for this work and will continue to do so for the length of this project.”