Armstrong County, PA Water Table Trend
Armstrong County's groundwater trend, from USGS's own readings
Over 25 years of USGS readings, the well tracking Armstrong County's aquifer is rising, getting shallower over time: 1.3 ft per decade.
One well stands in for Armstrong 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 18.2 ft below land surface. Readings span 2001-11-01 to 2026-09-17, 154 measurements from USGS well USGS-405344079380201 (Ar 109 Armstrong County Observation Well), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
Where Armstrong County ranks
Of the 1,449 US counties with a usable trend, Armstrong County ranks 205th from fastest-rising to fastest-declining, 1 is the fastest-rising water table measured, 1449 the fastest-declining. About 63,679 people live in Armstrong County, Pennsylvania. See the fastest-moving counties guide for how Armstrong County stacks up against the most extreme cases nationally.
A dropping table says nothing about water quality
Whether Armstrong 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.