Grundy County, IA Water Table Trend
Is the water table dropping in Grundy County, IA?
Grundy County's long-term well puts the trend at 0.2 ft per decade, holding roughly steady, based on 12 measurements since 1997.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Grundy County's source well, in detail
Depth to water at the last reading was 6.7 ft below land surface. Readings span 1997-07-23 to 2025-06-10, 12 measurements from USGS well USGS-422629092345001 (088n15w10dad 1996nawqa), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Grundy County compares nationally
Grundy County sits at rank 828th 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. Grundy County, Iowa is home to about 12,405 people. See the fastest-moving counties guide for how Grundy 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 Grundy 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.