Belknap County, NH Water Table Trend
Belknap County's groundwater trend, from USGS's own readings
Belknap County's long-term well puts the trend at 0 ft per decade, holding roughly steady, based on 222 measurements since 1995.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Belknap County's source well, in detail
Depth to water at the last reading was 2.4 ft below land surface. Readings span 1995-06-25 to 2017-05-30, 222 measurements from USGS well USGS-431916071125901 (Nh-Baw 10), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Belknap County compares nationally
Belknap County sits at rank 682nd 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. Belknap County, New Hampshire is home to about 65,257 people. See the fastest-moving counties guide for how Belknap 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 Belknap 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.