Sierra County, NM Water Table Trend
Is the water table dropping in Sierra County, NM?
Over 71 years of USGS readings, the well tracking Sierra County's aquifer is holding roughly steady: 0.4 ft per decade.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Sierra County's source well, in detail
Depth to water at the last reading was 17.8 ft below land surface. Readings span 1955-04-15 to 2026-01-27, 536 measurements from USGS well USGS-324917107183201 (Mbown-Rin5 17s.05w.24.124), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Sierra County compares nationally
Sierra County sits at rank 408th 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. Sierra County, New Mexico is home to about 11,389 people. See the fastest-moving counties guide for how Sierra 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 Sierra 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.