Arapahoe County, CO Water Table Trend
Arapahoe County's groundwater trend, from USGS's own readings
Over 32 years of USGS readings, the well tracking Arapahoe County's aquifer is rising, getting shallower over time: 2.1 ft per decade.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Arapahoe County's source well, in detail
Depth to water at the last reading was 5.7 ft below land surface. Readings span 1993-09-12 to 2025-12-11, 40 measurements from USGS well USGS-393633103512300 (Sc00505822aaa D6 Cottonwood Creek), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Arapahoe County compares nationally
Arapahoe County sits at rank 125th of 1,449 ranked counties, ordered rising-to-declining, so a low number means a rising water table and a high one means fast decline. Arapahoe County, Colorado is home to about 666,918 people. See the fastest-moving counties guide for how Arapahoe County stacks up against the most extreme cases nationally.
Depth and quality are separate questions
This page answers a depth question, not a quality one. A well in Arapahoe County can be stable in depth and still worth testing for quality, or declining and still test clean, the two are measured separately, and only a direct test settles the second one.