Sullivan County, MO Water Table Trend
Sullivan County, MO: the closest actual trend
The closest qualifying well to Sullivan County is 25 miles away in Grundy County, MO, where the trend runs rising, getting shallower over time.
Sullivan County itself has no monitoring well with enough history to call its own trend, so treat this as a regional estimate, not Sullivan County's own number. If you own a well here, comparing your own depth log against this regional figure is worth doing before assuming either way. See Grundy County, MO'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.
Sullivan County, Missouri in brief
About 5,750 people live across Sullivan County's 648 square miles, in Missouri. 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.