Marion County, IL Water Table Trend
What the closest monitoring well shows for Marion County
Clinton County, IL, 27 miles from Marion County, is the closest county with a qualifying well, and its water table is declining at a typical pace for a declining county.
No well inside Marion County clears this site's 15-year qualifying bar, so this is the closest real reading, not a measurement of Marion County's own aquifer. Worth checking your own well's depth log against it rather than assuming it matches. See Clinton 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 Marion County
Marion County, Illinois covers 573 square miles and is home to about 36,437 people. USGS's National Groundwater Monitoring Network covers 1,449 of 3,222 US counties (45%) today; Marion County isn't one of them yet, see the methodology guide for the exact qualifying bar.