Python scripts used to process eight water quality databases. Output files for Glorich (Global), Waterbase (EU), WQP (USA) and DWS (South Africa). References Graham, D.J., Bierkens, M.F.P., van Vliet, M.T.H., 2024. Impacts of droughts and heatwaves on river water quality worldwide. Journal of Hydrology 629, 130590, https://doi.org/10.1016/j.jhydrol.2023.130590 Hartmann, J., Lauerwald, R., Moosdorf, N., 2014. A Brief Overview of the GLObal RIver Chemistry Database. GLORICH. Procedia Earth Planet. Sci. 10, 23–27. https://doi.org/10.1016/J.PROEPS.2014.08.005 European Environment Agency: Waterbase – Water Quality ICM, available at: https://www.eea.europa.eu/data-and-maps/data/waterbase-water-quality-icm-2, Accessed 01/01/2022 Water Quality Portal. Washington (DC): National Water Quality Monitoring Council, United States Geological Survey (USGS), Environmental Protection Agency (EPA); 2021. doi: 10.5066/P9QRKUVJ Department of Water and Sanitation, South Africa. Research Quality Information Services, available at: https://www.dws.gov.za/iwqs/report.aspx, Accessed 01/01/2022