Maricopa County, AZ Water Table Trend
Maricopa County's groundwater trend, from USGS's own readings
Maricopa County's long-term well puts the trend at 28.2 ft per decade, declining faster than most declining counties, based on 17 measurements since 1941.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Maricopa County's source well, in detail
Depth to water at the last reading was 248.9 ft below land surface. Readings span 1941-03-31 to 2020-12-29, 17 measurements from USGS well USGS-333413112081101 (A-03-02 27dbb), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Maricopa County compares nationally
Maricopa County sits at rank 1441st 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. Maricopa County, Arizona is home to about 4,673,096 people. See the fastest-moving counties guide for how Maricopa County stacks up against the most extreme cases nationally.
If you own a well in Maricopa County
A dropping water table means a residential pump has to reach deeper and work harder, which shortens its life. In Maricopa County, that trend is real, not assumed: 28.2 ft per decade over 80 years.
Depth and quality are separate questions
This page answers a depth question, not a quality one. A well in Maricopa 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.