The new stricter water-saving measures will allow individual users 87 litres a day.
Capetonians are allowed to use 500 million litres a day.
This has been reduced from 600 million litres a day, an objective not reached.
The City of Cape Town said dam levels remained critical and needed to be filled during the wetter winter months for an expected dry summer.
“As we are expecting a very dry summer 2018 and rainfall probability and volume remains incredibly uncertain, we must cut our water use even more to save as much water as we can while we still have water,” said Xanthea Limberg, Mayoral Committee Member for Informal Settlements, Water and Sanitation.
Despite previous water restrictions, many domestic consumers were still using over 20 000 litres a month per household, Limberg said.
“We have been monitoring and engaging with high users and we will be issuing letters to them to warn them that we will be installing water management devices at properties with unjustifiably high consumption to limit their water use to acceptable levels,” Limberg says.
The monitoring would continue and engagements with stakeholders in business, the informal car wash sector and government departments would continue.