Hancock County, IA Water Table Trend
Hancock County's groundwater trend, from USGS's own readings
Hancock County's representative monitoring well shows depth to water declining, slower than most declining counties, a fitted trend of 0.9 ft per decade over 28 years of readings.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Hancock County's source well, in detail
Depth to water at the last reading was 8.3 ft below land surface. Readings span 1997-07-29 to 2025-06-10, 17 measurements from USGS well USGS-430159093403201 (095n24w21adad 1996nawqa Iadrn-2), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Hancock County compares nationally
Hancock County sits at rank 1069th 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. Hancock County, Iowa is home to about 10,616 people. See the fastest-moving counties guide for how Hancock County stacks up against the most extreme cases nationally.
If you own a well in Hancock County
A dropping water table means a residential pump has to reach deeper and work harder, which shortens its life. In Hancock County, that trend is real, not assumed: 0.9 ft per decade over 28 years.
Depth and quality are separate questions
This page answers a depth question, not a quality one. A well in Hancock 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.