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Niles Cone Groundwater Basin Monitoring
Monitoring Programs

The Spring and Fall Groundwater Monitoring Program

This long-term semi-annual groundwater monitoring program was initiated in 1961 to systematically monitor groundwater conditions.  Field work occurs during the spring and fall of each year in order to provide insight into subsurface conditions when water levels tend to be at their highest and lowest.  The program records the status of wells owned by public agencies and private owners, obtain water level measurements, and collect groundwater samples throughout the basin.  A Groundwater Monitoring Report is prepared annually to document the results of the field data collection.

Download a copy of the most recent Groundwater Monitoring Report. * 

* On February 16, 2017, Figures 10 and 16, as well as, Appendix D (Fall 2016 Groundwater Monitoring Records) of the Groundwater Monitoring Report, 2016, were revised per a laboratory correction of a chloride analytical result.  The revisions did not require any other changes in the report.

California Statewide Groundwater Elevation Monitoring (CASGEM) Program

The CASGEM Program was established in response to State Legislation which mandates a statewide monitoring program to track seasonal and long-term groundwater elevation trends in California's groundwater basins.  In 2012, ACWD was designated by the California Department of Water Resources (DWR) as a Monitoring Entity for the Niles Cone Groundwater Basin.  As a Monitoring Entity, ACWD developed a monitoring plan and regularly submits groundwater level measurements to the DWR's online database in an effort to improve the management of California's groundwater resources.

Additional information on CASGEM can be found at: