Day Zero is calculated based on knowing how much water is in the six major dams that feed Cape Town and the Western Cape Water Supply System, and knowing how much water is being used by the city's residents, by agriculture and what is evaporating out of the dam.
Mayor Patricia de Lille - who despite continued political battles remains in the saddle for now - said day zero was now "likely" and that the city was taking new emergency measures, including implementing Level 6B water restrictions from 1 February.
The map shows that many households across Cape Town are working hard to save water as part of the effort to get the city through their worst drought. When Day Zero arrives, residents will have to collect water at these sites.
Only vital services, such as hospitals and clinics, would be allowed to continue their existing water supply after Day Zero. Climate-change models have predicted that Cape Town would become increasingly dry. These proposed levies place additional pressure on Capetonians, who have lately been suffering under an vast water crisis. For the many businesses outside the CBD, however, it remains crucial to avoid Day Zero - and Limberg acknowledged dry taps would have a catastrophic economic impact.
The Department of Water and Sanitation under the guidance of Minister Nomvula Mokonyane gazetted new water restrictions for domestic, agricultural and industrial use within the Breede-Gouritz and Berg Olifants Water Management Areas.
Under the proposed drought levy, some 52 510 Capetonians were set to temporarily pay a fixed rate of R150 a month to make up for the City's R1.6bn loss in revenue from reduced water consumption.
Some Capetonians are now convinced that with dam levels so low, the quality of tap water has declined - a rumour that the city has been denying for months.
Limberg said the dire situation was being worsened by some people ignoring a push for residents and visitors to use no more than 87 liters of water per person per day.
'In January 2016, Capetonians as a whole were using 1.1 billion litres of a water a day. The new goal is 450 million litres, the city announced.
Cape Town is also a tourism hotspot, another challenge the government is facing. Close to 2 million tourists visit Cape Town every year.
The city also has a couple of projects lined up to supplement water supplies, including desalination plants, water recycling and drilling into the earth's natural underground reservoir with hopes of getting them up and running by March, EWN reports.