Placer County, CA Water Table Trend
Placer County, CA: the closest actual trend
Nevada County, CA, 16 miles from Placer County, is the closest county with a qualifying well, and its water table is rising, getting shallower over time.
No well inside Placer County clears this site's 15-year qualifying bar, so this is the closest real reading, not a measurement of Placer County's own aquifer. Worth checking your own well's depth log against it rather than assuming it matches. See Nevada 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 Placer County
Placer County, California covers 1,407 square miles and is home to about 433,822 people. USGS's National Groundwater Monitoring Network covers 1,449 of 3,222 US counties (45%) today; Placer County isn't one of them yet, see the methodology guide for the exact qualifying bar.