The date was previously set at June 4, so the latest update has postponed it by 35 days.
Meanwhile, Neilson said that the preparations for Day Zero continue as planned, along with the city's aggressive roll-out of pressure management initiatives and the installation of water management devices at the properties of high users across the metro.
However, Neilson also warned that Day Zero could also be moved back to June if the city fails to reduce its weekly water usage by 73 million litres, from the current 523 million litres to 450 million litres, by the time the water transfer ends.
Dams around the city have collective storage of 24.4%, or 219 045 megalitres (Ml), compared to total capacity of 898 221Ml. He did not specify when that would take place.
The Sunshine Tour has committed itself, during this, the week of the Cape Town Open, to use less water in an effort to assist the City of Cape Town and the citizens in their endeavours to save the scarce resource. "Last year we had abnormally low winter rainfall‚ and we can not assume that this year will be any different".
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A tough water-saving regime and the generosity of farmers have given South Africa's main tourist hub welcome respite from a severe drought and helped push back a dreaded "Day Zero" when Cape Town's taps are expected to run dry.
At the moment, restrictions make it compulsory for residents to use no more than 50 litres per person per day, as city officials look to see out the hot summer months into winter, when Cape Town usually gets rain. A five-minute shower uses around 45 litres.
Officials have also recommended that people collect and reuse their bathing water for their toilets, limit showers to two minutes, and wash their hands with hand sanitiser instead of water.
The City has since rerouted the water to ease the congestion at the facility.
In an update to its travel advice for South Africa, the Foreign and Commonwealth Office said: "The Western Cape is suffering from prolonged drought".