Allamakee County, IA Water Table Trend
Allamakee County's groundwater trend, from USGS's own readings
Allamakee County's representative monitoring well shows depth to water rising, getting shallower over time, a fitted trend of 4.3 ft per decade over 63 years of readings.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Allamakee County's source well, in detail
Depth to water at the last reading was 302 ft below land surface. Readings span 1957-04-25 to 2020-06-17, 7 measurements from USGS well USGS-431638091282801 (098n05w30acdc 08170 1957waukon 4), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Allamakee County compares nationally
Allamakee County sits at rank 64th 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. Allamakee County, Iowa is home to about 14,184 people. See the fastest-moving counties guide for how Allamakee 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 Allamakee 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.