McDonough County, IL Water Table Trend
McDonough County, IL: the closest actual trend
Hancock County, IL, 26 miles from McDonough County, is the closest county with a qualifying well, and its water table is declining faster than most declining counties.
No well inside McDonough County clears this site's 15-year qualifying bar, so this is the closest real reading, not a measurement of McDonough County's own aquifer. Worth checking your own well's depth log against it rather than assuming it matches. See Hancock 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 McDonough County
McDonough County, Illinois covers 589 square miles and is home to about 26,662 people. USGS's National Groundwater Monitoring Network covers 1,449 of 3,222 US counties (45%) today; McDonough County isn't one of them yet, see the methodology guide for the exact qualifying bar.