Severn Trent Costain will offer large multi-site water users a single expert supplier for all of their water and waste water requirements, from source to disposal. It is promoting itself as service to manage legal compliance and risk management issues, resolve water efficiency challenges and reduce costs. Severn Trent Services and Costain already work together in joint venture to operate and maintain more than 5,000 assets at 1,300 sites for the Ministry of Defence in one of the largest PFI contracts in Europe. Severn Trent will have a 60% share of the JV. It will contribute its UK non regulated, asset operation & maintenance, water hygiene, developer services and Design Build Operate (DBO) business, comprising gross assets of £100,000. Costain will hold a 40% share and will contribute the majority of its water hygiene testing business into the JV, also comprising gross assets of £100,000.