Sullivan County, IN Water Table Trend
The nearest real water-table reading to Sullivan County, IN
Vigo County, IN, 24 miles from Sullivan County, is the closest county with a qualifying well, and its water table is rising, getting shallower over time.
No well inside Sullivan County clears this site's 15-year qualifying bar, so this is the closest real reading, not a measurement of Sullivan County's own aquifer. Worth checking your own well's depth log against it rather than assuming it matches. See Vigo County, IN'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 Sullivan County
Sullivan County, Indiana covers 447 square miles and is home to about 20,768 people. USGS's National Groundwater Monitoring Network covers 1,449 of 3,222 US counties (45%) today; Sullivan County isn't one of them yet, see the methodology guide for the exact qualifying bar.