North Central Region Office
Department of Water Resources
3500 Industrial Blvd.
West Sacramento, CA 95691
PO Box 942836
Sacramento, CA 94236
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To manage the groundwater resource, it is important to know the depth to groundwater. This
information can be used to determine the amount of groundwater that can safely be withdrawn.
In this way, local water managers can prevent wells from going dry and prevent the movement
of poorer quality groundwater into an aquifer.
DWR's North Central Region Office and its cooperators monitor groundwater levels in about 2,000
wells in Central California. Most measurements are made twice a year, once in spring
when levels are highest, and once in fall when levels are lowest. Some groundwater levels
are monitored monthly.
DWR's Central District maintains an electronic database of groundwater level measurements
for part of Central California. The database contains nearly 170,000 individual
groundwater level measurements, some dating back to the early 1920s. These data are
available in printed reports or electronic form from this Web site.