Water quality conditions in St. Andrew Bay adjacent to the Naval Coastal Systems Center during the period November 1973 to August 1977 are reported. Water temperature, salinity, turbidity, acidity, dissolved oxygen, biochemical oxygen demand, net primary productivity, total coliform bacteria, and total bacteria parameters were measured in three zones designated shore, grass, and channel. Water quality was considered excellent and with no indication of any appreciable adverse effects from Center operations (Author).