This dataset contains chemical determinants of river water samples collected from the Wolf and Tamar catchments in South West England in December 2013. It is a part of the Centre for Ecology & Hydrology South West (SW) Project. Full details about this dataset can be found at https://doi.org/10.5285/c8c0b0d1-75d7-4127-92b2-5e87bb5a958d