Polk County, MN Water Table Trend
Polk County's groundwater trend, from USGS's own readings
Polk County's representative monitoring well shows depth to water rising, getting shallower over time, a fitted trend of 0.9 ft per decade over 30 years of readings.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Polk County's source well, in detail
Depth to water at the last reading was 5.3 ft below land surface. Readings span 1992-12-03 to 2023-04-26, 131 measurements from USGS well USGS-473945096202402 (E01s-R 148n45w01cbdd 01 0000249810), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Polk County compares nationally
Polk County sits at rank 270th 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. Polk County, Minnesota is home to about 30,413 people. See the fastest-moving counties guide for how Polk 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 Polk 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.