Wellington Water staff and contractors have restored the water supply to Titahi Bay, after a burst pipe this morning cut all supplies to the Porirua suburb.
The 150mm pipe burst in a shopping centre carpark in Porirua's main shopping district.
It took about six hours to repair.
The Titahi Bay reservoir dropped rapidly to around 15% of capacity by 3pm.
Wellington Water's acting general manager of customer operations, Jeremy McKibbin, said he was grateful that supply could be restored in time.
He said they were about to deploy emergency distribution points in Titahi Bay.