Marion County, IA Water Table Trend
Marion County's groundwater trend, from USGS's own readings
Marion County's representative monitoring well shows depth to water holding roughly steady, a fitted trend of 0.2 ft per decade over 28 years of readings.
One well stands in for Marion 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 4.3 ft below land surface. Readings span 1997-07-14 to 2025-06-11, 17 measurements from USGS well USGS-412927092575201 (077n18w08bbdc 1997nawqa Marion Co Iadrn-8), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
Where Marion County ranks
Of the 1,449 US counties with a usable trend, Marion County ranks 470th from fastest-rising to fastest-declining, 1 is the fastest-rising water table measured, 1449 the fastest-declining. About 34,048 people live in Marion County, Iowa. See the fastest-moving counties guide for how Marion County stacks up against the most extreme cases nationally.
A dropping table says nothing about water quality
Whether Marion 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.