Dataset on stable isotopic composition of δ18O and δ15N in nitrate in groundwater, and δ15N in solid matter in the Varaždin area, NW Croatia

The dataset relates to stable isotopic composition of δ18O and δ15N in nitrate in groundwater, and δ15N in solid matter collected in the Varaždin area in NW Croatia. The excel file consist of two sheets: (i) Groundwater and (ii) Solid matter. The dataset is of a multidisciplinary value and can be used by researchers (hydrogeologists, geochemists, microbiologists) working on groundwater contamination related problems and water quality management.