On-site sanitation provisions in urban slums rarely prioritise grey water management, yet it forms the largest fraction of wastewater. This study was carried out to characterise grey water and quantify its pollutant loads a typical urban slum of a developing country. Samples were collected for analysis from ten representative households as well as from 4 tertiary drains and the main drainage channel for 7 months in two dry seasons. The Chemical Oxygen Demand (COD) concentration in the grey water generated by laundry, in the kitchen and in the bathroom was 9225±1200 mgL-1, 71250±1011 mgL-1 and 4675±750 mgL-1, while the BOD5 (biochemical Oxygen demand) to COD ratio was 0.24±0.05, 0.33±0.08 and 0.31±0.07, respectively. The maximum concentration of Escherichia coli and total coliforms was 2.05x107 cfu.(100 mL)-1 and 1.75x108 cfu.(100 mL)-1, respectively, in grey water from the bathroom, while that of Salmonella spp. was 7.32x106 cfu.(100 mL)-1 from laundry. Analysis of variance (ANOVA) showed a significant difference in the concentration of COD, TSS (total suspended solids), TOC (total organic carbon), DOC (dissolved organic carbon), total phosphorus (TP), sodium adsorption ratio (SAR)and Salmonella species in grey water from laundry, bathroom and kitchen (P<0.05). The high loads of COD (>500 kg.d-1), TSS (>200 kg.d-1), 1.4 kg TP.d-1), and microorganisms (106 to 109 cfu.c-1d-1) show that grey water poses a threat to the environment and a risk to human health in urban slums. Therefore, there is a need to prioritise grey water treatment in urban slums of developing countries to achieve adequate sanitation.