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Abstract. Saltwater intrusion (SI) is considered as a silent contaminant to the groundwater resource especially places near the seashore and contamination of freshwater bodies such as the groundwater is a global issue, affecting water quality, vegetation, and soil conditions along coastal lines (Felisa, Ciriello, and Federico, 2013). The research work was conducted a) determine the present condition and extent of SI in selected coastal aquifers of Luzon, Visayas, and Mindanao through in situ profiling of interrelated parameters of total salinity. Five deep wells or shallow tubewells per study site, that is, selected farmer‘s fields served as observation wells (OW). Said study site is equivalent to one town per region in the 11 regions of the entire country. The multi parameter water quality meter was used to determine total salinity on real time setting. Total salinity level of the OWs that are tested above the threshold limit of 500 ppm are labeled as high saline. Arc GIS 4 was used to graphically demonstrate the areas into high saline and low saline. Results revealed that out of the eleven regions tested and monitored, nine regions are highly saline while the other two regions have salinity level below the set threshold limit. These results are the basis for policy recommendation on the proper utilization of the groundwater resource.