Jefferson County, MT Water Table Trend
Is the water table dropping in Jefferson County, MT?
Jefferson County's long-term well puts the trend at 1.7 ft per decade, rising, getting shallower over time, based on 59 measurements since 2000.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Jefferson County's source well, in detail
Depth to water at the last reading was 19.7 ft below land surface. Readings span 2000-06-17 to 2017-09-07, 59 measurements from USGS well USGS-462503112172302 (08n06w25adac02), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Jefferson County compares nationally
Jefferson County sits at rank 149th 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. Jefferson County, Montana is home to about 13,304 people. See the fastest-moving counties guide for how Jefferson 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 Jefferson 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.