Calhoun County, IL Water Table Trend
Calhoun County, IL: the closest actual trend
Lincoln County, MO, 17 miles from Calhoun County, is the closest county with a qualifying well, and its water table is declining faster than most declining counties.
No well inside Calhoun County clears this site's 15-year qualifying bar, so this is the closest real reading, not a measurement of Calhoun County's own aquifer. Worth checking your own well's depth log against it rather than assuming it matches. See Lincoln County, MO'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 Calhoun County
Calhoun County, Illinois covers 254 square miles and is home to about 4,224 people. USGS's National Groundwater Monitoring Network covers 1,449 of 3,222 US counties (45%) today; Calhoun County isn't one of them yet, see the methodology guide for the exact qualifying bar.