Union County, PA Water Table Trend
Union County's groundwater trend, from USGS's own readings
Over 59 years of USGS readings, the well tracking Union County's aquifer is holding roughly steady: 0.2 ft per decade.
One well stands in for Union 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 36.4 ft below land surface. Readings span 1967-10-10 to 2026-09-23, 263 measurements from USGS well USGS-405928077115501 (Un 51 Union 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 Union County ranks
Of the 1,449 US counties with a usable trend, Union County ranks 786th from fastest-rising to fastest-declining, 1 is the fastest-rising water table measured, 1449 the fastest-declining. About 42,159 people live in Union County, Pennsylvania. See the fastest-moving counties guide for how Union County stacks up against the most extreme cases nationally.
A dropping table says nothing about water quality
Whether Union 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.