Sonoma County, CA Water Table Trend
Sonoma County, CA: the closest actual trend
Colusa County, CA, 58 miles from Sonoma County, is the closest county with a qualifying well, and its water table is holding roughly steady.
No well inside Sonoma County clears this site's 15-year qualifying bar, so this is the closest real reading, not a measurement of Sonoma County's own aquifer. Worth checking your own well's depth log against it rather than assuming it matches. 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.
About Sonoma County
Sonoma County, California covers 1,575 square miles and is home to about 485,375 people. USGS's National Groundwater Monitoring Network covers 1,449 of 3,222 US counties (45%) today; Sonoma County isn't one of them yet, see the methodology guide for the exact qualifying bar.