Sullivan County, NY Water Table Trend
Sullivan County's groundwater trend, from USGS's own readings
Sullivan County's representative monitoring well shows depth to water holding roughly steady, a fitted trend of 0.1 ft per decade over 22 years of readings.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Sullivan County's source well, in detail
Depth to water at the last reading was 8.7 ft below land surface. Readings span 2005-02-16 to 2026-08-03, 110 measurements from USGS well USGS-414525074360601 (Local Number, Sv-535, Woodbourne 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 Sullivan County compares nationally
Sullivan County sits at rank 737th 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. Sullivan County, New York is home to about 80,450 people. See the fastest-moving counties guide for how Sullivan 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 Sullivan 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.