“…South Africa, which is classified as a water-stressed country, receives an average of 465 mm of rainfall per year, which is not only unevenly distributed across time and space, but also well below the global average (Donnenfeld et al, 2018;Knight, 2019). Moreover, partly due to failures in implementing an agenda of Integrated Water Resources Management (IWRM), water availability in South Africa is further constrained by persistent-and, by all accounts, worsening-water quality problems that are largely anthropogenic in nature (CSIR, 2010;King et al, 2018;Palmer & Munnik, 2018;du Plessis, 2019b;du Preez & van Huyssteen, 2020;Stuart-Hill et al, 2020;DWS, 2022a;Lukat et al, 2022;du Plessis, 2023). The most prominent water quality issues-which include eutrophication, salinisation, acidification, turbidity, sedimentation, and bacteriological contamination-are typically linked to runoff from urban areas and informal settlements, discharges and/or spills from wastewater treatment works and industrial sites, effluent from mining operations, and return flows from agricultural land and commercial forestry plantations (Griffin et al, 2014;King et al, 2018;du Preez & van Huyssteen, 2020;DWS, 2022a;Day & Davies, 2023;du Plessis, 2023).…”