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Part of the water supply on Tutuila, the territory’s main island, is subject to one of the longest boil-water-advisories in U.S. history. Turbidity and bacteria spikes during heavy rainfall events show many of the island’s most productive wells (Fig. 1) receive groundwater under the direct influence of surface water (GUDI). However, it’s unclear whether surface water reaches the wells through improperly sealed well casings (Fig 2-A), or through the aquifer matrix itself (Fig 2-B).

AN ISOTOPIC AND MICROBIOLOGICAL MULTI-TRACER APPROACH TO ASSESSING RECHARGE MECHANISMS IN SURFACE WATER AFFECTED WELLS ON TUTUILA, AMERICAN SAMOA