The quality of water service provision is poor. According to official figures from 2009, the average water availability per day was as follows: 22 hours in the North, 10 hours in the Bekaa, 8 hours in the South, and for Beirut-Mount Lebanon 13 hours in winter, but only 2 hours in summer. There is not a single village or city in Lebanon that receives an uninterrupted residential supply of water. Especially in summer, water shortages are common. For example, in Nabatieh Governorate water reached customers only three times a week in 2007. In Greater Beirut, water supply drops to 3 hours per day during the summer. According to the above-mentioned 2008 survey, the average Lebanese household received 6 hours per day in summer and 9 hours in winter. Only one quarter of Lebanese households received water every day. The continuity of supply was best in the North where 59% said they received water every day in 2008. It was worst in Beirut where this share was only 10%. Poor water quality and intermittent supply impose high costs on households to cope with these deficiencies. Buying water from trucks and the purchase of bottled water are common. Water is also commonly stored in roof tanks, which imposes both an additional cost and jeopardizes water quality. Many households also use pumps to make sure that water reaches the upper floors of houses, which imposes more costs on households. Low pressure and intermittent water supply are caused, among others, by intermittent electricity supply.