Grant County, WI Water Table Trend
Grant County's groundwater trend, from USGS's own readings
Grant County's long-term well puts the trend at 0.2 ft per decade, holding roughly steady, based on 873 measurements since 1946.
One well stands in for Grant 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 12.2 ft below land surface. Readings span 1946-07-10 to 2026-10-08, 873 measurements from USGS well USGS-425551090391301 (Gr-05/02w/06-0005), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
Where Grant County ranks
Of the 1,449 US counties with a usable trend, Grant County ranks 510th from fastest-rising to fastest-declining, 1 is the fastest-rising water table measured, 1449 the fastest-declining. About 52,330 people live in Grant County, Wisconsin. See the fastest-moving counties guide for how Grant County stacks up against the most extreme cases nationally.
A dropping table says nothing about water quality
Whether Grant 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.