About half the population does not have access to an improved water source, defined as a protected well, standpipe or a handpump within one kilometre. The few existing piped water supply systems are often not well maintained and the water they provide is often not safe to drink. Displaced people returning home put a huge strain on infrastructure, and the government institutions in charge of the sector are weak. Substantial external funding from numerous government agencies and non-governmental organizations is available to improve water supply.