Editing Water supply and sanitation in South Africa (section)

==Efficiency==
One indicator to measure the technical efficiency of water utilities is the level of [[non-revenue water]]. In a well-managed utility that level should be below about 25%. In Johannesburg, the estimated level declined from 44% in 2003 to 31% in 2006. In Durban it stood at an estimated average of 31% between 2002 and 2006. In Cape Town the estimates fluctuated significantly between 10% and 37%, suggesting that the estimates may not be reliable. The average level of non-revenue water for South African utilities participating in the International Benchmarking Network for Water and Sanitation Utilities in the 2002–2006 period was 31%.<ref>International Benchmarking Network for Water and Sanitation Utilities (IBNet):[https://www.ib-net.org/ Database Search for South Africa and Non-Revenue Water]. Retrieved 24 October 2010</ref>