Lee County, IL Water Table Trend
Lee County's groundwater trend, from USGS's own readings
Over 34 years of USGS readings, the well tracking Lee County's aquifer is holding roughly steady: 0.2 ft per decade.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Lee County's source well, in detail
Depth to water at the last reading was 5.3 ft below land surface. Readings span 1992-05-19 to 2026-09-18, 180 measurements from USGS well USGS-413743089310101 (19n8e-13.1a1 (Lee-92f Crn)), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Lee County compares nationally
Lee County sits at rank 803rd 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. Lee County, Illinois is home to about 33,544 people. See the fastest-moving counties guide for how Lee 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 Lee 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.