Welsh Water say they've been able to gain access to the water treatments site at Mayhill.
Staff have begun accessing the damage and develop a plan to get the water works back up and running.
More than 40 tankers have been helping pump water into the system which has helped keep supplies to the majority of its customers.
Water bottle stations remain in place at Monmouthshire Comprehensive School, Redbrook Road and Trellech Primary School.
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