Henderson County, IL Water Table Trend
Henderson County, IL: what the water table is actually doing
Henderson County's representative monitoring well shows depth to water declining at a typical pace for a declining county, a fitted trend of 2.1 ft per decade over 21 years of readings.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Henderson County's source well, in detail
Depth to water at the last reading was 22.6 ft below land surface. Readings span 2005-03-14 to 2026-08-18, 44 measurements from USGS well USGS-410252090541601 (071-1-41-159), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Henderson County compares nationally
Henderson County sits at rank 1197th 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. Henderson County, Illinois is home to about 6,048 people. See the fastest-moving counties guide for how Henderson County stacks up against the most extreme cases nationally.
If you own a well in Henderson County
A dropping water table means a residential pump has to reach deeper and work harder, which shortens its life. In Henderson County, that trend is real, not assumed: 2.1 ft per decade over 21 years.
Depth and quality are separate questions
This page answers a depth question, not a quality one. A well in Henderson 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.