Maries County, MO Water Table Trend
Maries County's groundwater trend, from USGS's own readings
Maries County's representative monitoring well shows depth to water declining at a typical pace for a declining county, a fitted trend of 2.5 ft per decade over 19 years of readings.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Maries County's source well, in detail
Depth to water at the last reading was 126.4 ft below land surface. Readings span 2007-10-25 to 2026-07-07, 47 measurements from USGS well MO005-381045091564801 (Vienna), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Maries County compares nationally
Maries County sits at rank 1222nd 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. Maries County, Missouri is home to about 8,506 people. See the fastest-moving counties guide for how Maries County stacks up against the most extreme cases nationally.
If you own a well in Maries County
A dropping water table means a residential pump has to reach deeper and work harder, which shortens its life. In Maries County, that trend is real, not assumed: 2.5 ft per decade over 19 years.
Depth and quality are separate questions
This page answers a depth question, not a quality one. A well in Maries 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.