Guernsey Water’s reserves have had a boost – with more water collected in 24 hours than in all of last week.

Between Wednesday and Thursday this week, more than 40 million litres of rain water was collected, boosting the utility’s storage levels by 1%.

This surge in rainfall will help the island’s water storage levels after a dry summer left Guernsey Water dealing with a 124 million litre deficit at the end of August.

Since then, the amount of water in storage has increased but the island is still using more than is collected on a daily basis.

Just over a week ago, Guernsey Water warned that the prolonged dry start to Autumn had seen supplies decline by 90 million litres during the first two weeks of October.

Together, our demand is around 82.5 million litres a week, with Guernsey Water asking us to continue being mindful about water use.

“Our usual levers of requesting you don’t water the garden or wash the car remain, but the truth is you’re far less likely to be doing that at this time of year anyway,” said a Guernsey Water spokesperson. “You responded in the summer and we saw an absolute shift in your water use, and we remain grateful.

“Most of this year’s rain fell in January, when we were 100% full and couldn’t store any more. Since then, it’s just been a story of dipping into storage, with only a handful of weeks where supply outstripped demand.

“At this point, unless these posts start acting as some sort of digital rain dance, all we can do is urge you to save water wherever you can. And don’t just confine that to the house, have those conversations at work – where and how can you save water in your workplace. Because if we don’t have the usual winter recharge – and quite simply, we cannot assume we will – the 2026 summer season may well prove challenging.

“Obviously there are many months of winter left and mother nature might decide to turn the sky taps on, but we wanted to mention this now so everyone understands the gravity of the situation if the reservoirs don’t refill.”

Guernsey Water has been pumping water from St Andrew’s reservoir into the St Saviour’s reservoir to ensure enough supply to keep our taps running.

The spokesperson said they are continually monitoring the situation with another water storage update due on 27 October.