San Diego County, CA Water Table Trend
The nearest real water-table reading to San Diego County, CA
Riverside County, CA, 66 miles from San Diego County, is the closest county with a qualifying well, and its water table is declining faster than most declining counties.
No well inside San Diego County clears this site's 15-year qualifying bar, so this is the closest real reading, not a measurement of San Diego County's own aquifer. Worth checking your own well's depth log against it rather than assuming it matches. See Riverside 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 Diego County
San Diego County, California covers 4,211 square miles and is home to about 3,298,799 people. USGS's National Groundwater Monitoring Network covers 1,449 of 3,222 US counties (45%) today; San Diego County isn't one of them yet, see the methodology guide for the exact qualifying bar.