Matt Weiser, PACIFIC STANDARD
California’s premier wine-growing region has been identified for more regulation under the state’s new groundwater law, likely resulting in new fees and limits on water extraction for the industry.
The state Department of Water Resources declared in May that 14 groundwater basins across the state face threats to groundwater, and thus should be reprioritized under the Sustainable Groundwater Management Act. Four of these are in Napa and Sonoma county wine-growing valleys.
The aquifers in question are the Sonoma Lowlands sub-basin in Napa and Solano counties, the Alexander Valley basin and Healdsburg area sub-basin in Sonoma County and the Wilson Grove Highlands basin in Sonoma and Marin counties. Each is a vital source of irrigation water for grape growing.
The department proposes to change these basins from “low” to “medium” priority under the law after reviewing new data on groundwater conditions and land use in each region. Previously, their low ranking meant these basins got a pass from complying with SGMA. If finalized in November, medium priority will require each basin to form a groundwater sustainability agency within two years, and complete a sustainability plan within five years.
Other groundwater basins in Napa and Sonoma counties are already subject to these requirements. The new additions mean virtually all of California’s top wine region now confronts costly groundwater regulations for the first time. Grape growing is the primary consumer of groundwater in each basin.