Anne Arundel County, MD Water Table Trend
Anne Arundel County's groundwater trend, from USGS's own readings
Anne Arundel County's long-term well puts the trend at 2.3 ft per decade, declining at a typical pace for a declining county, based on 292 measurements since 1939.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Anne Arundel County's source well, in detail
Depth to water at the last reading was 32.4 ft below land surface. Readings span 1939-01-01 to 2025-09-10, 292 measurements from USGS well USGS-385915076340401 (Aa De 1), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Anne Arundel County compares nationally
Anne Arundel County sits at rank 1210th 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. Anne Arundel County, Maryland is home to about 602,350 people. See the fastest-moving counties guide for how Anne Arundel County stacks up against the most extreme cases nationally.
If you own a well in Anne Arundel County
A dropping water table means a residential pump has to reach deeper and work harder, which shortens its life. In Anne Arundel County, that trend is real, not assumed: 2.3 ft per decade over 87 years.
Depth and quality are separate questions
This page answers a depth question, not a quality one. A well in Anne Arundel 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.