Carroll County, MD Water Table Trend
Carroll County's groundwater trend, from USGS's own readings
Carroll County's long-term well puts the trend at 0.2 ft per decade, holding roughly steady, based on 382 measurements since 1974.
One well stands in for Carroll 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 3.9 ft below land surface. Readings span 1974-11-19 to 2026-07-31, 382 measurements from USGS well USGS-392259077052401 (Cl Ec 75), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
Where Carroll County ranks
Of the 1,449 US counties with a usable trend, Carroll County ranks 791st from fastest-rising to fastest-declining, 1 is the fastest-rising water table measured, 1449 the fastest-declining. About 177,108 people live in Carroll County, Maryland. See the fastest-moving counties guide for how Carroll County stacks up against the most extreme cases nationally.
A dropping table says nothing about water quality
Whether Carroll 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.