Sangamon County, IL Water Table Trend
Sangamon County, IL: the closest actual trend
Macon County, IL, 38 miles from Sangamon County, is the closest county with a qualifying well, and its water table is declining, slower than most declining counties.
No well inside Sangamon County clears this site's 15-year qualifying bar, so this is the closest real reading, not a measurement of Sangamon County's own aquifer. Worth checking your own well's depth log against it rather than assuming it matches. See Macon 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 Sangamon County
Sangamon County, Illinois covers 868 square miles and is home to about 194,345 people. USGS's National Groundwater Monitoring Network covers 1,449 of 3,222 US counties (45%) today; Sangamon County isn't one of them yet, see the methodology guide for the exact qualifying bar.