BA advisory council chairman Viam Pillay says an investigation should be conducted to determine who is responsible for the outbreak of hepatitis A and leptospirosis in Ba last month.
A team of health officials was sent to Nukuloa after eight suspected cases of the diseases were reported from various settlements in the area.
Officials found 23 hepatitis cases and ordered the immediate shutdown of the Waica dam, a water source used by those infected as well as 400 other families.
The dam is owned by Ba-based M.R Dayal and Sons, that was given a month to clean it up.
However, after a visit by Prime Minister Commodore Voreqe Bainimarama, the Water Authority of Fiji took over the maintenance of the water source.
M.R Dayal and Sons director Brij Lal said during the PM's visit that they should not be held responsible.
"We should not be held responsible for all of this because we do not know the cause of the problem," Mr Lal had said.