Water levels in Jersey's reservoirs remain low, despite the recent rain.
Jersey Water says they are only just over half full, at 57% capacity.
It is restarting the desalination plant to turn seawater into freshwater, to boost the island's supplies.
The plant has already been used for two months, between the end of July and the end of September, following a very dry spring and summer.
It helped boost supplies by more than 200 million litres, but it is costly to run at more than £5,000 a day.
Rainfall levels are 30% lower than last year, and 20% below the five year average.
Whilst it has rained this week, Jersey Water says a lot more is need to recover reservoir storage levels.
It says, in the last two weeks alone, levels have dropped by 5%, the equivalent of 117 million litres.
Mark Bowden, Head of Water Resilience and Emergency Planning, said:
“We rely on the autumn and winter months to replenish our stocks. After such a dry spring and summer, if we don’t get sufficient rain before the end of the year, it could put us in a really difficult position going into 2026.
"While we’ve had some rain, there is still a long way to go before the reservoirs recover."
He says customers need to continue to heed its 'save water' messages to avoid any restrictions being imposed:
"Once again, we are asking people to reduce their usage as much possible to help preserve our Island’s supply.”
Jersey Water is joining Water Night this Thursday (23 October) - a national campaign by Waterwise that asks us not to use our taps between 5pm and 10pm to encourage us to think about how we use water.
Fort Regent, Mont Orgueil Castle and St Helier Town Hall will be lit in blue.
Mr Bowden said:
"Water Night is an opportunity for us all to stop and think about where we can cut back on waste.
"We understand that not everyone can turn off the taps between 17:00 and 22:00, but the real message is about being conscious of how we use this precious resource.
"Whether it’s shortening showers, fixing a dripping tap or waiting until the dishwasher is full before running it, every action helps protect our supplies. It’s our water and our responsibility."
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