Jones County, IA Water Table Trend
Jones County's groundwater trend, from USGS's own readings
Jones County's long-term well puts the trend at 106 ft per decade, declining faster than most declining counties, based on 6 measurements since 1990.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Jones County's source well, in detail
Depth to water at the last reading was 651 ft below land surface. Readings span 1990-11-01 to 2019-07-16, 6 measurements from USGS well USGS-420650091163601 (084n04w02dbbb 31624 1990anamosa 5), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Jones County compares nationally
Jones County sits at rank 1449th 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. Jones County, Iowa is home to about 21,116 people. See the fastest-moving counties guide for how Jones County stacks up against the most extreme cases nationally.
If you own a well in Jones County
A dropping water table means a residential pump has to reach deeper and work harder, which shortens its life. In Jones County, that trend is real, not assumed: 106 ft per decade over 29 years.
Depth and quality are separate questions
This page answers a depth question, not a quality one. A well in Jones 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.