This study explores the current state of groundwater chemistry and pollution by nitrate-nitrogen on Laura Island, Majuro Atoll, Republic of the Marshall Islands. The nitrogen load from various land-use types was calculated and its effect on groundwater evaluated to develop countermeasures to protect the freshwater lens on the island. Groundwater, land utilization and household surveys were conducted on Laura Island between February 2011 and November 2012. The results were as follows. 1 The

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... te-nitrogen concentration in the groundwater was relatively high in the southeast and northwest of the island. 2 The majority of the groundwater was classified as HCO 3 Ca 2 Mg 2 type, and the remainder was classified mainly as Cl SO 4 2