A company of Saint-Anaclet, near Rimouski, in Bas-Saint-Laurent, has been the prey of the flames, in the night from Thursday to Friday.
A major fire broke out in a building of the treatment Centre, BSL, located across the street from the train Station, to 2 h.
It is a site of treatment of sludge from septic tanks, of oily water and contaminated soil.
The assistance of the fire services of several municipalities has been required, according to the Sûreté du Québec.
There are no reports of any injuries. The cause of the disaster is unknown, but would be of incidental nature. Nothing suggests a criminal, said the police.