Water used for the washing of fresh tomatoes in major markets in South-eastern Nigeria has been shown to possess a high level of microbial contamination. Bacterial isolates may include Bacillus cereus, Lactobacillus spp. and Staphylococcus aureus. The fungal isolates consist of Penicillum spp., Aspergillus niger, and A. oryzae. Even the apparently ‘Potable’ water obtained from Bore-holes also exhibits the presence of some bacterial and fungal isolates. Although there is the absence of feacal indicators like Escherichia coli, Shigella and Clostridium, the outbreak of food borne diseases may be imminent. This is possible with the ingression of microorganisms from the wash water (containing dirty soil, organic materials etc.) into the tomato fruits. The presence of Aspergillus spp. (which are established to be carcinogenic) in the water, may pose a serious health problem to consumers since microorganisms can be drawn into the fruits through osmotic action. Other postharvest handling processes like packaging, transportation and storage are also affected. Focus should be drawn towards ensuring Good Agricultural Practices (GAP) especially with regards to water quality during the food chain especially in areas where the cold-chain is inefficient or absent. [Life Science Journal. 2009; 6(3): 80– 82] (ISSN: 1097 – 8135)