Madison County, IA Water Table Trend
Madison County, IA: the closest actual trend
Polk County, IA, 34 miles from Madison County, is the closest county with a qualifying well, and its water table is holding roughly steady.
No well inside Madison County clears this site's 15-year qualifying bar, so this is the closest real reading, not a measurement of Madison County's own aquifer. Worth checking your own well's depth log against it rather than assuming it matches. See Polk County, IA'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 Madison County
Madison County, Iowa covers 561 square miles and is home to about 17,161 people. USGS's National Groundwater Monitoring Network covers 1,449 of 3,222 US counties (45%) today; Madison County isn't one of them yet, see the methodology guide for the exact qualifying bar.