Harris County, TX Water Table Trend
Harris County's groundwater trend, from USGS's own readings
Harris County's representative monitoring well shows depth to water declining faster than most declining counties, a fitted trend of 22.7 ft per decade over 92 years of readings.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Harris County's source well, in detail
Depth to water at the last reading was 146.4 ft below land surface. Readings span 1929-08-03 to 2021-02-03, 235 measurements from USGS well USGS-294415095165301 (Lj-65-22-317), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Harris County compares nationally
Harris County sits at rank 1439th 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. Harris County, Texas is home to about 5,009,302 people. See the fastest-moving counties guide for how Harris County stacks up against the most extreme cases nationally.
If you own a well in Harris County
A dropping water table means a residential pump has to reach deeper and work harder, which shortens its life. In Harris County, that trend is real, not assumed: 22.7 ft per decade over 92 years.
Depth and quality are separate questions
This page answers a depth question, not a quality one. A well in Harris 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.