Raw data for all grab samples and radon survey samples in this study.

Grab sample data are categorized by type (groundwater–gw, surface water–surf, and well) and location. Date collected and lat long indicate the sampling date and location of sampling. Rn concentrations (Bq/m3), temperature (°C), and salinity are given for each grab sample. Additionally, nutrient data (TN, TP, DIP, DSi, NOx, NH4+, DIN, and DON) are provided in μM. Radon survey data show location (lat long), date and time of measurement, water depth (m), salinity, and temperature (°C), and the radon concentration (Bq/m3). (XLSX)