South East Water (SEW) is facing an investigation by regulator Ofwat after repeated outages left tens of thousands of households and businesses across Kent and Sussex without drinking water.
The news came after the government asked the watchdog to review the company's licence.
On Tuesday, Ofwat said it was concerned that 23,000 properties were still affected by outages across the counties where a major incident was declared the previous day.
SEW said on Wednesday morning that supplies had been restored to 8,000 properties across the two counties, but later said the total was 16,000.
However, it did confirm that the 6,500 properties in Tunbridge Wells that had been on a "boosted system" had lost supplies for the day.
In a statement, SEW incident manager Matthew Dean supplies "have now been returned to 15,000 properties in East Grinstead and supplies should be returned to the remaining 1,500 properties tonight [Wednesday].
The outages were blamed on power cuts and burst pipes caused by Storm Goretti overnight between Friday and Saturday last week.
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