Access to clean water and sanitation is an issue for some households. Over $250 million was invested by the UN and other organisations to build Dili's water infrastructure. Existing water sources and transportation infrastructure are considered sufficient to meet the immediate needs of the city, although work continues to improve quality and reliability. In 2007, 25% of residents received 24 hours of water. As of 2013, while 36% of households were connected to the water supply system, half Dili received less that six hours of water a day. Furthermore, water quality was irregular, with boiling advised. By 2015, it remained the case that less than 30% of those in Dili had access to a continuous water supply. In 2018, water remained available on average from 4 to 8 hours.