People were asked to reduce their water use by 20 litres a day until the end of March and avoid non-essential use such as washing cars or water blasting.
Aucklanders have been warned if significant savings are not made Watercare may be forced to release partially-treated water into the system forcing people to boil water.
The water savings apply to everyone in the region as far north as Waiwera and as far south as Pukekohe.
Water consumption steadily dropped during the weekend since a plea was made on Friday by authorities to cut back.
Watercare tips to save water
1. Cut your shower time by two minutes: Estimated saving: 16 litres.
2. Turn off the tap when brushing your teeth. Estimated saving: 4 litres.
3. Only run your dishwasher when it's full.
4. Only run your washing machine when it's full.
5. Use the half-flush on your toilet.