San Francisco County, CA Water Table Trend
San Francisco County, CA: the closest actual trend
San Mateo County, CA, 42 miles from San Francisco County, is the closest county with a qualifying well, and its water table is declining, slower than most declining counties.
No well inside San Francisco County clears this site's 15-year qualifying bar, so this is the closest real reading, not a measurement of San Francisco 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 San Francisco County
San Francisco County, California covers 47 square miles and is home to about 827,526 people. USGS's National Groundwater Monitoring Network covers 1,449 of 3,222 US counties (45%) today; San Francisco County isn't one of them yet, see the methodology guide for the exact qualifying bar.