Washington County, IL Water Table Trend
Washington County, IL: the closest actual trend
Clinton County, IL, 18 miles from Washington 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 Washington County clears this site's 15-year qualifying bar, so this is the closest real reading, not a measurement of Washington 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 Washington County
Washington County, Illinois covers 563 square miles and is home to about 13,535 people. USGS's National Groundwater Monitoring Network covers 1,449 of 3,222 US counties (45%) today; Washington County isn't one of them yet, see the methodology guide for the exact qualifying bar.