Moody County, SD Water Table Trend
Moody County's groundwater trend, from USGS's own readings
Moody County's long-term well puts the trend at 0.2 ft per decade, holding roughly steady, based on 43 measurements since 1978.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Moody County's source well, in detail
Depth to water at the last reading was 8.7 ft below land surface. Readings span 1978-06-26 to 2026-10-01, 43 measurements from USGS well USGS-440405096290501 (107n47w16cccc (Flandreau Well)), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Moody County compares nationally
Moody County sits at rank 501st 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. Moody County, South Dakota is home to about 6,529 people. See the fastest-moving counties guide for how Moody 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 Moody 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.