Aucklanders have used 419 million litres of water in the past 24 hours, exceeding the daily target, and the situation remains fragile.
Watercare says the target usage remains at 400 million litres a day, meaning all Aucklanders need to continue to save at least 20 litres of water per person, per day.
Ardmore Water Treatment Plant is still working at half its usual capacity as it deals with silt in the main catchment supply (Hunua dams).
Other water treatment plants at Waitakere, Huia and Onehunga are working harder than normal to keep Aucklanders supplied with A-grade quality water.
If consumption soars to last week’s levels of around 460 million litres a day, partially treated water will need to be released into the network and a boil water notice will be issued.