Scarcity of fresh water sources and lack of sanitation has been a constant challenge facing Solomon Islands. Reducing the number of those living without access to fresh water and sanitation by half was one of the 2015 Millennium Development Goals (MDGs) implemented by the United Nations through Goal 7, to ensure environmental sustainability. Though the islands generally have access to fresh water sources, it is typically only available in the state's capital of Honiara, and it is not guaranteed all year long. According to a UNICEF report, even the capital's poorest communities do not have access to adequate places to relieve their waste, and an estimated 70% Solomon Island schools have no access to safe and clean water for drinking, washing and relieving of waste. Lack of safe drinking water in school-age children results in high risks of contracting fatal diseases such as cholera and typhoid. The number of Solomon Islanders living with piped drinking water has been decreasing since 2011, while those living with non-piped water increased between 2000 and 2010. Nevertheless, one improvement is that those living with non-piped water has been decreasing consistently since 2011.