There have been substantial improvements in access to water supply, and to a lesser extent to sanitation, over the past fifteen years. Remaining challenges include a low level of wastewater treatment (only 13% of collected wastewater is being treated), lack of house connections in the poorest urban neighbourhoods, and limited sustainability of rural systems (20 percent of rural systems are estimated not to function). In 2005 a National Sanitation Program was approved that aims at treating 60% of collected wastewater and connecting 80% of urban households to sewers by 2020. The issue of lack of water connections for some of the urban poor is being addressed as part of the National Human Development Initiative, under which residents of informal settlements have received land titles and have fees waived that are normally paid to utilities in order to connect to the water and sewer network.