Napa County, CA Water Table Trend
Napa County, CA: the closest actual trend
The closest qualifying well to Napa County is 47 miles away in Colusa County, CA, where the trend runs holding roughly steady.
Napa County itself has no monitoring well with enough history to call its own trend, so treat this as a regional estimate, not Napa County's own number. If you own a well here, comparing your own depth log against this regional figure is worth doing before assuming either way. See Colusa County, CA's full page. See the no-data guide for why a county this close to a qualifying well still doesn't get its own number.
Napa County, California in brief
About 132,727 people live across Napa County's 752 square miles, in California. USGS's National Groundwater Monitoring Network covers 1,449 of 3,222 US counties (45%) today; Napa County isn't one of them yet, see the methodology guide for the exact qualifying bar.