Abstract: Water in Comilla district of Bangladesh has been known to contaminate with heavy toxic metals especially arsenic and some ions, such as, Ca, Mg, Na, Cl, K, B, Cl, SO4 and HCO3. The presence of these toxic metal and ions in water are important parameters to evaluate water quality. For this study, 30 water samples were collected. The chemical analyses of these samples were done for quality assessment. The results showed that more than 50% samples were arsenic contaminated. But in case of ions contamination, all samples were in acceptable range. In addition, water suitability classification for drinking and irrigation purposes was performed based on some physicochemical parameters, such as electrical conductivity (EC), total dissolved solid (TDS), total hardness (HT), sodium adsorption ratio (SAR), and soluble sodium percentage (SSP). Based on the physiochemical properties of the analyzed samples were classified as “permissible” class and very few samples as “unsuitable” class. Although most samples are in “permissible” category, the presence of high level of arsenic makes waters unsafe for all living things, such as, humans, animals, and plants. This study was done thus to serve two purposes, one is to make awareness of the toxicity of heavy metal and irons and two is to seek quality water supply program either provided by public or private.