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No sprinklers or irrigation systems can be used and outdoor hosing is not allowed.
Watering gardens and lawns is only permitted using a hand-held watering can or bucket filled directly from a tap.
Chief engineer Ulrich Glasner said continuing warm weather had led to increased demand for water.
“This combination of dry weather and high demand has resulted in Luggate’s reservoir not replenishing sufficiently over successive nights, so we’re calling on all residents, visitors and local businesses to reduce usage now.
‘‘With everyone’s co-operation, we can avoid reaching critical levels and the potential for a boil water notice.”
The restrictions will remain in place until further notice is provided.