Most cities and provinces have no centralized wastewater, solid waste or hazardous treatment plants. This means that storm water and household wastewater discharge through combined and out-dated drainage systems into canals and rivers making them seriously polluted. The prime Minister stated in decision No. 1336 dated September 2008 that it was mandatory for new urban residential areas and industrial parks to develop a plan and construct separate drainage systems for storm and wastewater (Anh, 2010).