Todd County, SD Water Table Trend
Todd County, SD: what the water table is actually doing
Todd County's long-term well puts the trend at 0.3 ft per decade, holding roughly steady, based on 344 measurements since 1959.
One well stands in for Todd County's whole aquifer here, the honest simplification every page on this site carries.
What the well actually measured
The most recent reading put water 62 ft below land surface. Readings span 1959-11-23 to 2025-06-17, 344 measurements from USGS well USGS-430148100471001 (35n29w07bbbb (Td-59a)), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
Where Todd County ranks
Of the 1,449 US counties with a usable trend, Todd County ranks 424th from fastest-rising to fastest-declining, 1 is the fastest-rising water table measured, 1449 the fastest-declining. About 9,172 people live in Todd County, South Dakota. See the fastest-moving counties guide for how Todd County stacks up against the most extreme cases nationally.
A dropping table says nothing about water quality
Whether Todd County's water table is rising or falling is independent of what's actually in the water. Depletion can concentrate naturally-occurring minerals, so it's worth checking directly with a water test rather than assuming a depth trend says anything about quality.