Winnebago County, WI Water Table Trend
Winnebago County's groundwater trend, from USGS's own readings
Winnebago County's long-term well puts the trend at 2.1 ft per decade, rising, getting shallower over time, based on 15 measurements since 2001.
One well stands in for Winnebago 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 15 ft below land surface. Readings span 2001-08-13 to 2025-09-24, 15 measurements from USGS well USGS-435907088462502 (Wi-18/14e/36-0841), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
Where Winnebago County ranks
Of the 1,449 US counties with a usable trend, Winnebago County ranks 120th from fastest-rising to fastest-declining, 1 is the fastest-rising water table measured, 1449 the fastest-declining. About 173,307 people live in Winnebago County, Wisconsin. See the fastest-moving counties guide for how Winnebago County stacks up against the most extreme cases nationally.
A dropping table says nothing about water quality
Whether Winnebago 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.