Gallatin County, MT Water Table Trend
Gallatin County, MT: what the water table is actually doing
Over 20 years of USGS readings, the well tracking Gallatin 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.
Gallatin County's source well, in detail
Depth to water at the last reading was 1.4 ft below land surface. Readings span 2004-10-12 to 2024-05-02, 137 measurements from USGS well USGS-454043110004501 (02s06e08caac01 Bzn-02), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Gallatin County compares nationally
Gallatin County sits at rank 911th 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. Gallatin County, Montana is home to about 126,984 people. See the fastest-moving counties guide for how Gallatin 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 Gallatin 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.