Lehigh County, PA Water Table Trend
Is the water table dropping in Lehigh County, PA?
Lehigh County's representative monitoring well shows depth to water rising, getting shallower over time, a fitted trend of 1.8 ft per decade over 68 years of readings.
One well stands in for Lehigh 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 76.9 ft below land surface. Readings span 1958-07-01 to 2026-08-18, 244 measurements from USGS well USGS-403429075392401 (Le 644 Lehigh 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 Lehigh County ranks
Of the 1,449 US counties with a usable trend, Lehigh County ranks 143rd from fastest-rising to fastest-declining, 1 is the fastest-rising water table measured, 1449 the fastest-declining. About 385,655 people live in Lehigh County, Pennsylvania. See the fastest-moving counties guide for how Lehigh County stacks up against the most extreme cases nationally.
A dropping table says nothing about water quality
Whether Lehigh 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.