Nantucket County, MA Water Table Trend
Nantucket County, MA: what the water table is actually doing
Over 53 years of USGS readings, the well tracking Nantucket County's aquifer is holding roughly steady: 0.1 ft per decade.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Nantucket County's source well, in detail
Depth to water at the last reading was 44.7 ft below land surface. Readings span 1973-03-21 to 2026-07-30, 535 measurements from USGS well USGS-411544070042301 (Ma-Nbw 39 Nantucket, Ma), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Nantucket County compares nationally
Nantucket County sits at rank 766th 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. Nantucket County, Massachusetts is home to about 14,670 people. See the fastest-moving counties guide for how Nantucket 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 Nantucket 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.