Proper use of treated wastewater is gaining acceptance of the publicaround the world, as a means of supplementing scarce fresh water resources. Theaim of this study is to investigate the most feasible tertiary treatments to be added toone of the existing Macau wastewater treatment plants in order to find an economicway to attain for its treated wastewater a number of recognized qualities that wouldmake it suitable for region-specific reuse purposes such as street washing, landscapeirrigation, etc. Sand filtration and microfiltration by membrane filters, either aloneor followed by UV disinfection downstream, were tested experimentally. Resultsshow that sand filtration is not good enough, while membrane filtration with UVsterilizer delivers promising results.