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Sprinklers have been banned in Alderney to protect water supplies, the island's water board has said.
Staff said residents and gardeners should not use them until further notice "at night or in the daytime".
They said the ban followed "a long period of dry, sunny weather with many people spending more time in their gardens as a result of lockdown restrictions" which had caused a spike in water usage.
Gardeners should "use only a domestic hand-held garden hose", they added.
BBC News Online
Water supplies in the Watford area have been affected overnight as their storage reservoir north of the town ran almost empty yesterday.
Affinity Water said the "the high level of demand" it was experiencing was due to lockdown and more people being at home. A spokesman said the firm worked overnight to restore supplies.
Last week there was a problem with a loss of water supply in Harpenden and Wheathampstead.
Across England, people have been urged to save water as utility companies attempt to meet "sky-high" demand.
In a series of tweets this morning Affinity said: "We are experiencing low pressure in certain parts of our network due to demand.
"With the increase in people being at home and using nearly 50% more water than they normally would when its hot.
"We currently have teams working around the clock to treat the water faster, to get it in to homes quicker, this is the reason for lower pressure."
BBC Radio Cornwall
South West Water said demand for tap water has "rocketed" in the past couple of months.
Recent rises in temperatures had seen demand increase, and South West Water is now needing to supply an extra 20 million litres a day in Cornwall - the equivalent of supplying another city the size of Truro.
Rob Scarrott, head of water resources and water efficiency, said it would make a big difference if customers saved five litres of tap water a day.
He called on people to think of how their water comes from reservoirs and rivers when they turn their taps on.
"So if you think about that during these dry periods, it draws very hard on those," he said.
BBC South West
Demand for tap water from customers of South West Water has "rocketed", the utility has said.
The company said recent rises in temperatures had seen demand increase, with it needing to treat and pump an additional 50 million litres of water a day - twice the equivalent of supplying Exeter.
It said: "There’s only so much water we can treat and pump through the network, so we need your help to reduce demand."
It suggested that if people saved five litres of tap water a day, such small changes would make "a big difference when multiplied by our 1.8 million customers".
South West Water provides water and sewerage services to Devon and Cornwall and parts of Dorset and Somerset.