Smoke is still coming from the waste processing business, Green Gorilla.
Earlier the company's chief executive, Elaine Morgan, told Morning Report fire fighters did not have enough water to properly fight the blaze.
She said crews are having to run hoses the length of the street in Onehunga to get enough water.
The fire began Wednesday afternoon, forcing neighbouring businesses to evacuate.
Reporter Felix Walton spoke to Ingrid Hipkiss.