Monmouth County, NJ Water Table Trend
Monmouth County's groundwater trend, from USGS's own readings
Monmouth County's long-term well puts the trend at 0.3 ft per decade, holding roughly steady, based on 12 measurements since 1925.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Monmouth County's source well, in detail
Depth to water at the last reading was 92.3 ft below land surface. Readings span 1925-04-04 to 2023-10-31, 12 measurements from USGS well USGS-401138074012501 (250014-- Avon Pw 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 Monmouth County compares nationally
Monmouth County sits at rank 418th 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. Monmouth County, New Jersey is home to about 647,520 people. See the fastest-moving counties guide for how Monmouth 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 Monmouth 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.