This dataset contains the codes for water laboratory analysis, water sample identification, sampling dates and locations for water samples collected from the Tamar catchment in winter 2013/2014 as part of the South West project. It should be used in conjunction with datasets describing water bacteria and water eukaryote operational taxonomic unit sequence data. Full details about this dataset can be found at https://doi.org/10.5285/d36fb15b-6cfb-4488-b6b7-2b62dcf00b46
