CAG : Delhi has been facing water shortage and contamination of the commodity due to gross under-utilisaiton of rainey wells, generation and distribution losses and improper treatment. The 18 rainey wells in Delhi have an installed capacity of 14,000 gallons, of which only 42 per cent is being utilised though the city faces an average water shortage of 30 per cent, says the latest report of the Comptroller and Auditor General of India.