California Active Groundwater Level Network.
(Map generated 7/28/2015)
The
Active Groundwater Level Network contains water levels and well
information from more than 20,000 wells that have been measured by the
USGS or USGS cooperators at least once within the past 13 months. This
network includes all of these wells, regardless of measurement
frequency, aquifer monitored, or the monitoring objective.
The U.S. Geological Survey has a database/archive of about 850,000 wells
across the Nation. Information about these wells is available to the
world via NWISWeb (http://waterdata.usgs.gov/nwis/gw).
Through various groundwater programs, the USGS actively measures water
levels in, or collects data from more than 20,000 of these wells each
year. These wells are measured for a variety of disparate purposes, such
as statewide monitoring programs, or more local effects like monitoring
well drawdown, hydrologic research, aquifer tests, or even earthquake
effects on water levels.
There also are a variety of networks among these actively measured
wells; a National Climate Response Network for wells, Regional Networks
like the High Plains Aquifer Monitoring Program that is designed to
monitor storage changes in the High Plains Aquifer, state-based networks
that are designed to monitor statewide groundwater conditions, and
local networks designed to monitor pumping effects.
Groundwater Watch is maintained by the Office of Groundwater.