Coles County, IL Water Table Trend
Coles County, IL: the closest actual trend
Clark County, IL, 26 miles from Coles County, is the closest county with a qualifying well, and its water table is rising, getting shallower over time.
No well inside Coles County clears this site's 15-year qualifying bar, so this is the closest real reading, not a measurement of Coles County's own aquifer. Worth checking your own well's depth log against it rather than assuming it matches. See Clark County, IL'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 Coles County
Coles County, Illinois covers 508 square miles and is home to about 46,423 people. USGS's National Groundwater Monitoring Network covers 1,449 of 3,222 US counties (45%) today; Coles County isn't one of them yet, see the methodology guide for the exact qualifying bar.