Marin County, CA Water Table Trend
What the closest monitoring well shows for Marin County
San Mateo County, CA, 49 miles from Marin County, is the closest county with a qualifying well, and its water table is declining, slower than most declining counties.
No well inside Marin County clears this site's 15-year qualifying bar, so this is the closest real reading, not a measurement of Marin County's own aquifer. Worth checking your own well's depth log against it rather than assuming it matches. See San Mateo 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 Marin County
Marin County, California covers 520 square miles and is home to about 256,400 people. USGS's National Groundwater Monitoring Network covers 1,449 of 3,222 US counties (45%) today; Marin County isn't one of them yet, see the methodology guide for the exact qualifying bar.