Pima County, AZ Water Table Trend
Is the water table dropping in Pima County, AZ?
Pima County's long-term well puts the trend at 1.7 ft per decade, rising, getting shallower over time, based on 57 measurements since 1941.
One well stands in for Pima 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 321.9 ft below land surface. Readings span 1941-11-01 to 2019-01-24, 57 measurements from USGS well USGS-314830111243101 (D-19-09 03aca1), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
Where Pima County ranks
Of the 1,449 US counties with a usable trend, Pima County ranks 153rd from fastest-rising to fastest-declining, 1 is the fastest-rising water table measured, 1449 the fastest-declining. About 1,080,149 people live in Pima County, Arizona. See the fastest-moving counties guide for how Pima County stacks up against the most extreme cases nationally.
A dropping table says nothing about water quality
Whether Pima 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.