Madison County, TN Water Table Trend
Madison County, TN: what the water table is actually doing
Madison County's long-term well puts the trend at 0.1 ft per decade, holding roughly steady, based on 472 measurements since 1949.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Madison County's source well, in detail
Depth to water at the last reading was 128.3 ft below land surface. Readings span 1949-06-30 to 2026-08-17, 472 measurements from USGS well USGS-354223088380201 (Md:N-001), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Madison County compares nationally
Madison County sits at rank 559th 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. Madison County, Tennessee is home to about 100,409 people. See the fastest-moving counties guide for how Madison 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 Madison 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.