A spokesperson for the water company said: “Given the long-term forecast of dry weather and another forecast of very hot temperatures coming this week, we are planning to announce a temporary use ban in the coming weeks.
“We have written to the Environment Agency to update them on our approach and informed Ofwat.
“The timing is not confirmed due to a number of operational and legal procedural requirements but we will be updating our customers, partners, regulators and stakeholders at the earliest time to ensure a co-ordinated approach.
“In the meantime, we continue to urge our customers to only use what they need for their essential use.”
It comes after the Met Office issued a four-day amber warning for extreme temperatures in parts of England and Wales as a new heatwave looms.
The warning, for Thursday to Sunday, comes as the forecaster predicted 35C in places or even an “isolated” 36C – below last month’s record temperatures, which peaked above 40C in some spots.
Delays to travel are possible and there is an increased risk of water accidents and fires as more people visit coasts and beauty spots, the Met Office also warned.