On Monday, the city said Rand Water reservoirs supplying Centurion and nearby suburbs were experiencing low water levels. The reservoirs most affected included Valhalla and Clifton.
On Tuesday, the city said parts of Laudium, Saulsville and Atteridgeville, west of Pretoria, were also affected.
The city said it had dispatched water tankers to assist the communities where there had been a loss of water supply.
“We will continue monitoring the situation from Rand Water and making whatever adjustments we can and the city will continue to communicate on developments in this regard until the issue is resolved,” Tshwane spokesperson Samkelo Mgobozi said.
In Johannesburg, Diepsloot did not have any water as its reservoir was less than 1m full on Wednesday evening.
Ekurhuleni said the city had applied restrictions on the water network to alleviate pressure on reduced capacity.
It said the areas most affected by low water pressure during peak hours include Bedfordview, Edenvale, Germiston and Tembisa.
Ekurhuleni urged residents to use water sparingly.