Abstract: This work assessed the quality and use of water from Alau Dam Maiduguri, Borno State on the physical, chemical and microbiological parameters. Raw water sample were collected at River Ngadda, Lake Alau, domestic, industrial and irrigation water use points from Alau as well as treated water from Alau Dam as supplied to households by Borno Water Corporation. Using purposive sampling technique, Six (6) samples were taken and analysed for physical parameters: colour and turbidity. Chemical parameters: phenolphthalein, total Alkalinity, total hardness, calcium hardness, magnesium hardness, chloride, sulphate, fluoride, nitrites, PVC estimate, TDS, Free chlorine, magnesium, calcium, copper, lead ,zinc and Iron. Microbiological parameters: Aerobic Mesophilic count, coliform, E. coli count and P. aeruginosa. The result shows that the value for some of the parameters are within the maximum limits of World Health Organisation (WHO) and National Agency for Food, Drug Administration and Control (NAFDAC) standards while some parameters especially, turbidity for treated water as well as PH, turbidity of some, untreated water and microbiological parameters for, all untreated water were above maximum limits prescribed by WHO and NAFDAC. Therefore, the research has revealed that Alau Dam, Maiduguri suffers from pollution as a result of in-stream uses and on-site activities, thus, outbreak of communicable diseases has been experience in the area, mitigating these problems on human health and environment