Meanwhile, the death toll from the incident has climbed to 30 as rescue efforts continue.
The country’s prime minister suggests heavy rains and faulty construction are to blame.
The breach at the Xe Pian Xe Namnoy hydropower project in Champassak leaves at least seven downstream villages submerged.
Compensation was promised by June but has still not been paid, Lao sources say.
Government representatives 'try to change the conversation,' one rights group says.
Their finding differs from that of a recent report by Save the Children which cites a higher figure.
Villagers complain about foul odors from a stream polluted by the factory.