In 2011 Moore et al reported on the performance of polypropylene liners and covers in the South Australian potable water industry. It was found that this material suffered accelerated oxidation and premature failure when exposed to chlorinated and chloraminated potable water. Given that storage of potable water was the primary function of the liners and covers, diminished service life was of significant concern to asset owners. This paper provides an update on the water industry’s response to those issues. The performance of various geomembrane materials is reviewed based on published research, physical testing and site service. Testing methods are reviewed as to applicability. Asset owners have limited knowledge of the properties of active liners and covers and find it difficult to make investment decisions due to imprecise estimates of remaining life. Typical methods for evaluating the performance and remaining life of in service geomembrane liners and covers are proposed.