Madison County, ID Water Table Trend
Madison County's groundwater trend, from USGS's own readings
Madison County's representative monitoring well shows depth to water rising, getting shallower over time, a fitted trend of 1.2 ft per decade over 66 years of readings.
One well stands in for Madison 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 51.1 ft below land surface. Readings span 1957-07-10 to 2023-04-14, 25 measurements from USGS well USGS-434749111571801 (05n 38e 02bad1), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
Where Madison County ranks
Of the 1,449 US counties with a usable trend, Madison County ranks 225th from fastest-rising to fastest-declining, 1 is the fastest-rising water table measured, 1449 the fastest-declining. About 55,549 people live in Madison County, Idaho. See the fastest-moving counties guide for how Madison County stacks up against the most extreme cases nationally.
A dropping table says nothing about water quality
Whether Madison 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.