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The domestic water system favors the growth and reproduction of bacterial species. The removal of such contaminant by the application of chemical disinfectants like chlorine may pose health risk. Therefore, the natural products have more authenticity and to be investigated for their antimicrobial activity. The current study investigates the efficiency of frankincense oil as an antimicrobial agent on bacterial species isolated from the domestic water system. In the previous study, 15 bacterial species were isolated based on the colony morphological characteristics and prepared for identification. 16S rRNA gene was amplified using PCR for all bacterial isolates followed by sequencing and identification using BLAST. Thirteen bacterial isolates were identified and represented as Staphylococcus saprophhyticus, Bacillus pumilus, Bacillus safensis and Pseudomonas sp. and the last one showed more resistance to frankincense oil as the numbers increased with the treatment by 26% and 35%. Other species were either completely or partially eliminated. The results confirmed that the antimicrobial activity of frankincense oil against some bacterial species, mainly exist in storage tank. Pseudomonas sp. showed resistance to frankincense oil (10%) used in this study. In addition, Staphylococcus saprophhyticus is of a concern to human health; however, it showed sensitivity to frankincense oil and also, its presence in the water tank indicates hygiene issues to the household. The frankincense oil found to be a promising disinfectant, thus further analysis needed to specify the minimum effective concentration to be applied, also to find out whether it is cost effective to be used as a disinfectant.

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