Toxin producing cyanobacteria are becoming more abundant in drinking water reservoirs around the World. Cylindrospermopsis raciborskii is a potential toxin producing cyanobacterium commonly found in drinking water reservoirs in South East Queensland. This cyanobacterium produces the cyclic hepatotoxin cylindrospermopsin. With potentially lethal effects on humans, cylindrospermopsin must be removed from drinking water. Typical treatment methods (flocculation, sedimentation and filtration) are effective in cellular removal, however, such processes often result in cell lysis and hence the release of intracellular toxins. It is important to remove the dissolved cyanotoxin from the water. Several methods of removal have been examined including, oxidation by chlorine and ozone, and ultra violet degradation with the addition of titanium dioxide. Each method is effective in cylindrospermopsin removal under various conditions. Chlorination is pH dependent and ultra violet degradation is more efficient with the addition of titanium dioxide.