She said kiwi typically lay two eggs a year, and the other egg which was found in the nest is due to hatch in the next three weeks. There is a probability it would also be white.
Visitors to the centre may be able to see the chick at feeding time over the next few weeks, depending on how much support the chick needed.
She said unfortunately they can't guarantee viewing as it is really up to the chick and how quickly it begins to feed itself.
Ms Houkaumau said each chick would be assessed individually to see if they would be released into the wild.
Local Maori iwi Rangitane o Wairarapa will name the chick over the next few days.
Chief executive and Pukaha board member Jason Kerehi said: "We have always known the reserve at Pukaha Mount Bruce is a very special and spiritual place, this third white kiwi is confirmation of what we have always known."