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Abstract: Earth imaging data – acquired using satellite, airborne, and ground-based geophysical methods - can be used to provide the information about groundwater systems that is an essential starting point for groundwater management. Over the past ten years in California, the combination of extensive periods of drought and the introduction of groundwater legislation has raised the awareness of 1) how little we know about the functioning of groundwater systems and 2) how difficult it is to get the data we need to sustainably manage these systems. We are now using data from satellites (primarily InSAR) and from airborne and ground-based electromagnetic systems to characterize the large-scale architecture and connectivity of groundwater systems; and to search for sites of natural recharge and for managed recharge. With the recent acquisition by the state of 25,000 kilometers of geophysical data, Earth imaging technologies are playing a critical role in supporting the sustainable management of California’s freshwater resources.

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