Scottish Water Business Stream Limited,^[1] trading as Business Stream, is a water retail business operating in both Scotland and England's competitive non-domestic water markets, with its headquarters in Edinburgh.^[2] It also has offices in Glasgow, Worthing and Bradford. The company is a subsidiary of Scottish Water, the publicly owned utility which serves the residential water market across Scotland.

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Having previously supplied all of Scotland's properties with water, Scottish Water split its non-domestic arm off to serve the fledgling market. The newly formed company, called Business Stream, acted as the incumbent non-domestic water and waste water supplier for organisations in the country.^[3]

In June 2020, Business Stream reported that since the market opened in 2008, it has helped its customers save over £272 million through discounts and water and energy efficiencies.^[4]

On 8 December 2011, the Department for Environment, Food and Rural Affairs (DEFRA) published the Water for life market reform proposals, which suggested the introduction of competition to England's non-residential water market.^{[citation needed]}

Business Stream registered for a licence to compete in the English market, as reported in the Sunday Times in 2009.^[5] It has since stated that it has secured contracts with Network Rail, Cancer Research UK, Lloyds Banking Group and the Ministry of Justice.^[6][7][8][9]