Warren County, IL Water Table Trend
Warren County, IL: what the water table is actually doing
Warren County's representative monitoring well shows depth to water declining faster than most declining counties, a fitted trend of 14.8 ft per decade over 95 years of readings.
One well stands in for Warren 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 346 ft below land surface. Readings span 1925-04-01 to 2020-06-24, 16 measurements from USGS well USGS-405427090385801 (11n 2w-29.8a2), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
Where Warren County ranks
Of the 1,449 US counties with a usable trend, Warren County ranks 1422nd from fastest-rising to fastest-declining, 1 is the fastest-rising water table measured, 1449 the fastest-declining. About 16,217 people live in Warren County, Illinois. See the fastest-moving counties guide for how Warren County stacks up against the most extreme cases nationally.
What a declining table means for a well pump
Because Warren County's water table is actually declining, not just a general worry, a well owner here should consider comparing home-warranty plans that cover well-pump failure before one happens.
A dropping table says nothing about water quality
Whether Warren 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.