This report, prepared by Christine Weiben of the U.S. Geological Survey (USGS) in cooperation with the BBNEP, is an assessment of one of the indicators presented in the BBNEP Monitoring Program Plan. The BBNEP 2005 State of the Bay Technical Report includes an assessment of six of these indicators. The USGS prepared this assessment of the ground-water quality indicator for inclusion in a future BBNEP State of the Bay Technical Report.