NASA scientists have said California will run out of water in 12 months.
The state only has one year of supply left in its reservoirs due to persistent drought and is also running out of backup groundwater.
Scientists suggeste immediate water-rationing measures must be put into place after a four year drought has left reservoirs near empty.
70 per cent of the Californian States water use by residents comes from sprinklers and other gardening activities.
It was hoped that after Governor Jerry Brown declared a drought emergency at the beginning of last year, Californians would reduce their water usage by 20 per cent however usage was only reduced by 9%.