While talking about the presence of potential genotoxins in water samples, arising mainly from the anthropogenic activities (i.e. industrial chemicals, biocides, agrochemicals, pharmaceuticals, etc.), we must take into consideration the (geno)toxic compounds arising from different water treatment strategies, especially disinfection of drinking water by chlorination.38 New strategies for reduction of genotoxins in drinking water (like granular activated carbon, filtration, chemical destruction, ozone, chlorine dioxide and monochloramine) have to be considered. Granular activated carbon treatment has been found to be effective for removal mutagens from drinking water. All disinfectant chemicals appear to have the capacity of forming mutagenic chemicals during water treatment.1,2 It has been shown that the levels of mutagenicity formed with the alternative disinfectants have been generally less than those seen with chlorine and especially in the case of ozone.38 So the resolution of the question how best accomplish avoiding chlorination by-products in drinking water and maintaining the microbiologically safe drinking water lies in alternative treatment methods like ozonation and others, which on behalf of certain public safety, need to be tested by bioassays