Day County, SD Water Table Trend
Day County, SD: the closest actual trend
Roberts County, SD, 36 miles from Day County, is the closest county with a qualifying well, and its water table is rising, getting shallower over time.
No well inside Day County clears this site's 15-year qualifying bar, so this is the closest real reading, not a measurement of Day County's own aquifer. Worth checking your own well's depth log against it rather than assuming it matches. See Roberts County, SD'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 Day County
Day County, South Dakota covers 1,028 square miles and is home to about 5,408 people. USGS's National Groundwater Monitoring Network covers 1,449 of 3,222 US counties (45%) today; Day County isn't one of them yet, see the methodology guide for the exact qualifying bar.