Abstract
This study investigates the physicochemical and microbiological quality of groundwater beneath the Qoboza Klaaste (Q/K) building, Doornfontein Campus at the University of Johannesburg (UJ), South Africa, and whether it is suitable for human consumption. Groundwater ingress is a persistent structural and resource concern, exacerbated by legacy mining impacts and urban sewer infrastructure. Groundwater samples were analysed against the South African National Standards (SANS 241:2015) for potable water. Physical parameters (pH and electrical conductivity) were found to be compliant, whereas turbidity exceeded acceptable limits in 8 out of 15 samples. Microbiological tests revealed consistent detection of Total Coliforms and E. coli, indicating faecal contamination. Acid Mine Drainage (AMD) was not a significant factor; sewer line leakage was identified as the primary source of contamination. Untreated groundwater is unsuitable for human consumption but may be safely repurposed for non-potable applications. Recommendations include sump infrastructure upgrades, routine water quality monitoring, and disinfection strategies to mitigate health risks and enable potential reuse. Q/K Groundwater, if not treated it can be used for flushing toilets and watering gardens