Households and businesses in parts of East Sussex that have been without water for a third day have been told supplies should return this evening.
A burst main and subsequent airlocks in the system caused "pockets of localised no water problems" in Jarvis Brook, Rotherfield and Crowborough.
South East Water said technicians had been working to resolve the issue.
It came after two other water mains burst on Wednesday, affecting more than 4,000 customers.
Repairs have since been made.
Bottled water stations were set up for those affected.
South East Water said technicians had been working all day "to flush the air from our pipework to restore supplies but this is taking longer than expected for a few customers".
Douglas Whitfield, operations director, added: "We restored supplies to the majority of customers overnight but some areas around Crowborough, Rotherfield and Jarvis Brook remain without water while the network refills.
"Our reservoirs are now returning to normal levels and the last remaining customers in these areas should see their supplies return this evening."
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