Jefferson County, NY Water Table Trend
Jefferson County's groundwater trend, from USGS's own readings
Over 21 years of USGS readings, the well tracking Jefferson County's aquifer is holding roughly steady: 0.2 ft per decade.
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 2.8 ft below land surface. Readings span 2005-11-08 to 2026-10-20, 109 measurements from USGS well USGS-441214075542101 (Local Number, J-176, At Orleans Four Corners Ny), 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 834th 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, New York is home to about 113,140 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.