Peoria County, IL Water Table Trend
Peoria County, IL: what the water table is actually doing
Over 24 years of USGS readings, the well tracking Peoria County's aquifer is rising, getting shallower over time: 0.9 ft per decade.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Peoria County's source well, in detail
Depth to water at the last reading was 19.3 ft below land surface. Readings span 1997-07-02 to 2021-07-07, 13 measurements from USGS well USGS-405638089360801 (11n 8e-8.2a), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Peoria County compares nationally
Peoria County sits at rank 257th 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. Peoria County, Illinois is home to about 179,630 people. See the fastest-moving counties guide for how Peoria 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 Peoria 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.