Water trucks were being sent into a Kwai Fong public housing estate on Thursday afternoon, after reports of lead-contaminated tap water there.
The Democratic Party had earlier warned that tests it arranged on drinking water at Kwai Tsui Estate showed supplies contained excessive amounts of the heavy metal. The party said one sample contained around 10 times the maximum acceptable level of lead as recommended by the World Health Organisation.
Development Secretary Michael Wong said the Water Supplies Department (WSD) was arranging for trucks to be stationed at the estate for residents to get fresh water from.
"I understand that the residents are concerned about the quality of water, so the WSD is making arrangements to provide in situ water support. We think that will be available this afternoon," he said.
Wong said the department was conducting further tests on the tap water at the estate and the results could be available later in the day.
"At the moment, we will focus our efforts on finding out the facts. Depending on the outcome, we will do our best to make sure that the water quality is satisfactory."
Kwai Tsui is a new estate and residents only started moving in from April.
The lead contamination scare comes three years after supplies to 11 public housing estates were discovered to have a similar problem and some residents were found to have excessive levels of the heavy metal in their blood.
The government came under fire following a Commission of Inquiry into the scandal, with officials accused of passing the buck over the problem.