Custer County, ID Water Table Trend
Custer County's groundwater trend, from USGS's own readings
Over 57 years of USGS readings, the well tracking Custer County's aquifer is declining faster than most declining counties: 5.6 ft per decade.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Custer County's source well, in detail
Depth to water at the last reading was 251.9 ft below land surface. Readings span 1966-07-26 to 2023-04-11, 45 measurements from USGS well USGS-434847113284501 (06n 25e 33aab1), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Custer County compares nationally
Custer County sits at rank 1323rd 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. Custer County, Idaho is home to about 4,597 people. See the fastest-moving counties guide for how Custer County stacks up against the most extreme cases nationally.
If you own a well in Custer County
A dropping water table means a residential pump has to reach deeper and work harder, which shortens its life. In Custer County, that trend is real, not assumed: 5.6 ft per decade over 57 years.
Depth and quality are separate questions
This page answers a depth question, not a quality one. A well in Custer 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.