The study was carried out to determine the bromate contents in popular commercially available different brands of bottled and sachet drinking water in Aba metropolis. To assess the health risk of bromate in ozonised bottled and sachet water in Aba metropolis, South Eastern Nigeria Bromate determination was done using spectrophotometric method after treatment of the samples and absorbance was measured at 530 nm. The mean concentration of Br03- in different brands of bottled water was found to be 4.09±0.44 μg/l (range: 3.48±0.50 – 4.98±0.79 μg/l). On the other hand, the mean concentration of bromate ion in sachet water was 5.07± 0.78 μg/l with range 3.15±0.26 – 6.33±0.78 μg/l. Correlation analysis showed that bromate formation was influenced by the presence of bromide ions. There was a high cancer risk assessment resulting from the ingestion of bromate in bottled and sachet water which could occur overtime while both the drinking water were safe from the chemical toxicity risk point of view.