Mapping groundwater discharge zones in West Neck Bay, Shelter Island, New York was done using direct contact resistivity logging and transient seepage rate measurements. The study found that conductivity values varied from 280 S/cm in freshwater zones to 12,800 S/cm in high salinity zones. The discharge zone extended 10-75 feet offshore, with seepage velocities ranging from 1.27 x 10 -3 cm/s to 3.94 x 10 -5 cm/s. The total daily discharge due to underflow in the north-east section of the bay was estimated to be 1.72 x 10 6 /day, comparable to the recharge in the area estimated at 1.50 x 10 6 /day.