About 30 Bulli homes are still without water after a main burst on the Princes Hwy in Bulli this afternoon.
Sydney Water received numerous reports of a major break about 2.30pm. A crew has been on site since 3pm.
The burst had initially affected 100 customers, however supplies were rezoned and the problem isolated to Black Diamond Place and the Princes Hwy.
There is no word yet on when services will be restored to the remaining 30 homes.
Sydney Water is investigating the cause of the break.
The incident is slowing southbound on the Princes Hwy and traffic is expected to remain this way until midnight.