Green County, WI Water Table Trend
Is the water table dropping in Green County, WI?
Green County's long-term well puts the trend at 1.4 ft per decade, rising, getting shallower over time, based on 842 measurements since 1946.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Green County's source well, in detail
Depth to water at the last reading was 129 ft below land surface. Readings span 1946-07-12 to 2026-10-08, 842 measurements from USGS well USGS-424427089494701 (Gn-03/06e/18-0002), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Green County compares nationally
Green County sits at rank 179th 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. Green County, Wisconsin is home to about 37,183 people. See the fastest-moving counties guide for how Green 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 Green 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.