Walworth County, SD Water Table Trend
Walworth County, SD: what the water table is actually doing
Over 50 years of USGS readings, the well tracking Walworth County's aquifer is rising, getting shallower over time: 4.6 ft per decade.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Walworth County's source well, in detail
Depth to water at the last reading was 22.3 ft below land surface. Readings span 1976-08-31 to 2026-10-05, 50 measurements from USGS well USGS-453027099505001 (124n75w35dddd (Walworth Gw Well Wl-76p)), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Walworth County compares nationally
Walworth County sits at rank 57th 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. Walworth County, South Dakota is home to about 5,270 people. See the fastest-moving counties guide for how Walworth 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 Walworth 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.