Spatially Heterogeneous Saltwater Intrusion in Philippine Coastal Aquifers Across Luzon, Visayas, and Mindanao

This dataset contains field-monitoring records from 396 water-quality stations across 11 Philippine administrative regions (Luzon, Visayas, and Mindanao), comprising 381 well/groundwater stations and 15 co-located river/pond stations sampled as a tidal-influence reference. Each record includes Total Dissolved Solids (TDS, mg/L), temperature, dissolved oxygen, conductivity, and salinity, along with town, barangay, and station identifiers. GPS coordinates (decimal degrees) are available for stations in Region I (Ilocos) and Region XIII (Caraga/Siargao Island); coordinates were not recorded for the other nine regions. This dataset supports the analysis presented in "Spatially Heterogeneous Saltwater Intrusion in Philippine Coastal Aquifers Across Luzon, Visayas, and Mindanao."