Groundwater provides most of the drinking water used in the Barnegat Bay watershed, as well as most of the fresh water input to the estuary. Subsurface flow represents a significant contaminant transport pathway from the land surface to the estuary. Therefore, tracking the status of groundwater quality is an important means for tracking success in meeting CCMP water quality goals. This report describes an assessment of this particular water-qualityrnindicator by the U.S. Geological Survey.