Tanzania has pulled the plug on a British and German-run company [City Water] supplying water to the country's commercial capital, Dar es Salaam...Dar es Salaam's three million residents have increasingly had to cope with erratic supplies and water shortages...reports...said City Water planned to challenge the government's decision to terminate its contract in court...City Water is owned by Britain's Biwater International, Gauff Ingenieure of Germany and Tanzanian investors Superdoll Trailer Manufacturers Limited...A spokeswoman for Biwater said the company was waiting for a reply to a request for clarification from the government on its announcement that City Water's contract had been terminated.