Gregory County, SD Water Table Trend
Gregory County, SD: what the water table is actually doing
Gregory County's representative monitoring well shows depth to water holding roughly steady, a fitted trend of 0.2 ft per decade over 61 years of readings.
One well stands in for Gregory County's whole aquifer here, the honest simplification every page on this site carries.
What the well actually measured
The most recent reading put water 22.6 ft below land surface. Readings span 1957-09-14 to 2018-09-25, 323 measurements from USGS well USGS-430743099115001 (96n71w13ccbb), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
Where Gregory County ranks
Of the 1,449 US counties with a usable trend, Gregory County ranks 527th from fastest-rising to fastest-declining, 1 is the fastest-rising water table measured, 1449 the fastest-declining. About 4,110 people live in Gregory County, South Dakota. See the fastest-moving counties guide for how Gregory County stacks up against the most extreme cases nationally.
A dropping table says nothing about water quality
Whether Gregory County's water table is rising or falling is independent of what's actually in the water. Depletion can concentrate naturally-occurring minerals, so it's worth checking directly with a water test rather than assuming a depth trend says anything about quality.