Arlington County, VA Water Table Trend
Arlington County, VA: what the water table is actually doing
Arlington County's representative monitoring well shows depth to water holding roughly steady, a fitted trend of 0.1 ft per decade over 69 years of readings.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Arlington County's source well, in detail
Depth to water at the last reading was 43.9 ft below land surface. Readings span 1958-01-01 to 2026-09-17, 530 measurements from USGS well USGS-385253077042301 (54v 3), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Arlington County compares nationally
Arlington County sits at rank 575th 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. Arlington County, Virginia is home to about 239,807 people. See the fastest-moving counties guide for how Arlington 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 Arlington 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.