Around 10,000 homes in east London and Essex had no supply or low water pressure due to pipe bursts.
Kam Rai says the disruption "is causing significant and unacceptable inconvenience and distress".
Thousands of houses in Essex and east London have been affected by the shortages since Saturday.
Thames Water says three pipes have been fixed, but customers queuing for bottled water demand refunds.
More than 10,000 homes with water supply issues will have to wait for a fix, Thames Water says.
A burst water main in South Woodford has caused disruption to 14 postcode areas in east London and Essex.
Two railway enthusiasts join forces to renovate a classic electric commuter train.
It follows "London postcode wars" spilling on to the streets of a seaside resort last summer.
A group of teenagers are accused of being involved in a fight, some with machetes.
