Jersey Water has announced that it will soon be turning on the island's desalination plant.
The plant is used to remove salt from sea water and turn it into drinking water.
It was last used in 2012 after a dry summer, but this year it is the autumn rainfall that has been unusually low.
November has seen just 29mm of rainfall so far, compared to the average 106mm, meaning that reservoirs are now less than half full.
The desalination plant costs more than twice as much as treating reservoir water, but staff at Jersey Water say this should not impact customers.
WATCH:Sophia Bird has the exclusive story, and speaks to the CEO, of Jersey Water, Helier Smith.
READ MORE: £6m upgrade for Jersey's desalination plant