Many Vancouver Island communities rely on groundwater as their primary supply of drinking water. Sustainable management of this resource is essential to the prosperity, health, and development of this region. Few people recognize that the ground beneath our feet is a gigantic reservoir of fresh water and that it requires active management to ensure sustainable usage, and to avoid contamination. An essential part of this management plan is the mapping of aquifers (water-bearing geologic material like sand and gravel) and the regions that ensure ongoing replenishment of this underground reservoir. This presentation will summarize some ongoing work relating to the use of shallow geophysics to refine aquifer mapping and to aid in developing geologic models of the subsurface in support of groundwater management.