Baltimore County, MD Water Table Trend
Baltimore County, MD: what the water table is actually doing
Baltimore County's representative monitoring well shows depth to water rising, getting shallower over time, a fitted trend of 6.3 ft per decade over 84 years of readings.
One well stands in for Baltimore 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 11.3 ft below land surface. Readings span 1943-01-01 to 2026-09-29, 284 measurements from USGS well USGS-391356076293501 (Ba Gf 11), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
Where Baltimore County ranks
Of the 1,449 US counties with a usable trend, Baltimore County ranks 43rd from fastest-rising to fastest-declining, 1 is the fastest-rising water table measured, 1449 the fastest-declining. About 852,425 people live in Baltimore County, Maryland. See the fastest-moving counties guide for how Baltimore County stacks up against the most extreme cases nationally.
A dropping table says nothing about water quality
Whether Baltimore 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.