The wet winter of 2017 brought an opportunity to test groundwater recharge – the intentional spreading of water on fields to percolate into the aquifer – as a tool for restoring groundwater levels and helping basins comply with the Sustainable Groundwater Management Act (SGMA). This is especially important in the San Joaquin Valley, which has the biggest imbalance between groundwater pumping and replenishment in the state.
Sinking land caused by intensive groundwater pumping in the San Joaquin Valley is releasing trapped arsenic — a known carcinogen — into aquifers that supply irrigation and drinking water for a million people, according to a new study published Tuesday in the journal Nature Communications. Arsenic, a naturally occurring chemical in the Earth’s crust, is undetectable by the human senses and has been linked to a host of diseases including heart disease, diabetes, and cancer. Researchers at Stanford University say residents should be concerned about arsenic levels in their water supply.
Construction is underway on a Palm Desert groundwater replenishment facility, which the Coachella Valley Water District says will add up to 25,000 acre-feet of Colorado River water into the aquifer each year. The new facility will be built in two phases, one placing replenishment ponds just south of the water district’s Steve Robbins Administration Building and another involving the construction of ponds within the Whitewater River Stormwater Channel, between Cook Street and Fred Waring Drive. An estimated completion date was not provided by CVWD.
For years, Californians have mismanaged the aquifers that supply the state with about 40 percent of its water supplies. Declining water levels from over-pumping have left less water for agriculture, urban, and other uses in many areas of the state. But the problems do not stop with groundwater users. Groundwater and surface water are closely connected, so declining groundwater can reduce streamflow at critical times of the year, and can devastate rivers, streams, and wetlands.
When a contaminated aquifer in Orange County made U.S. Environmental Protection Agency Administrator Scott Pruitt’s list of top-priority sites for “immediate, intense action,” the local water district was quick to highlight the announcement. But questions of political favoritism are swirling over Pruitt’s decision in December to prioritize cleaning the Orange County North Basin groundwater pollution plume beneath Anaheim and Fullerton using the federal Superfund program. Newly disclosed records show the action occurred soon after a meeting between Pruitt, the Orange County Water District and its lawyers that was arranged by conservative radio and television host Hugh Hewitt.
The Water News Network is San Diego County’s source for water news and information.
