Cobb County, GA Water Table Trend
Cobb County's groundwater trend, from USGS's own readings
Cobb County's representative monitoring well shows depth to water holding roughly steady, a fitted trend of 0.3 ft per decade over 29 years of readings.
One well stands in for Cobb 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 6.5 ft below land surface. Readings span 1997-07-14 to 2026-09-28, 172 measurements from USGS well USGS-335612084312901 (09ff17), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
Where Cobb County ranks
Of the 1,449 US counties with a usable trend, Cobb County ranks 882nd from fastest-rising to fastest-declining, 1 is the fastest-rising water table measured, 1449 the fastest-declining. About 787,538 people live in Cobb County, Georgia. See the fastest-moving counties guide for how Cobb County stacks up against the most extreme cases nationally.
A dropping table says nothing about water quality
Whether Cobb 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.