Sanborn County, SD Water Table Trend
Sanborn County, SD: the closest actual trend
The closest qualifying well to Sanborn County is 29 miles away in Beadle County, SD, where the trend runs rising, getting shallower over time.
Sanborn County itself has no monitoring well with enough history to call its own trend, so treat this as a regional estimate, not Sanborn 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 Beadle 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.
Sanborn County, South Dakota in brief
About 2,392 people live across Sanborn County's 569 square miles, in South Dakota. USGS's National Groundwater Monitoring Network covers 1,449 of 3,222 US counties (45%) today; Sanborn County isn't one of them yet, see the methodology guide for the exact qualifying bar.