Residents in Forest Hill, Yeoville, Meredale and Benoni have no water due to an electrical fault at the Zwartkopjes Booster Pumping station on Wednesday.
A joint statement from Rand Water, Ekurhuleni Municipality, the City of Johannesburg and Johannesburg Water, said an investigation is underway, to determine areas affected.
Areas in Roodepoort and Randburg are also without water, as the Commando system is also under investigation. That reservoir supplies Hursthill, Crosby, Brixton, Crown Gardens, Eagles Nest, Aeroton, Johannesburg CBD, Berea, Parktown, Yeoville and surrounds.
Areas with no water on the East Rand supplied by the Benoni reservoir, are Morehill, Farramere, Northmead, Brentwood Park, Goedeburg, Rynfield and surrounds.
In the next 3 days, the maintenance of the electrical system is expected to begin at the Palmiet Station.