“Napa Valley’s annual groundwater checkup concluded that water levels in a majority of monitoring wells were stable in spring 2018, despite a drop in overall groundwater storage following a subpar rainy season.
The valley’s vast underground reservoir that farmers tap to irrigate the region’s world-famous vineyards held an estimated 210,000 acre-feet of water. That’s about seven times as much water contained in a full Lake Hennessey. … ”
Read more from the Napa Register here: Report says Napa County’s 2018 groundwater levels stable