The response to this is that the department works in collaboration with others on the water quality issues. You referenced petrochemicals. These are in the jurisdiction of Environment and Climate Change Canada, as well as the provincial authorities responsible for the water quality, if you will, of deleterious-type substances that may need to be controlled for entry into freshwater systems.
It's not our direct jurisdiction in DFO to do that work, but we work with others when there are impacts sufficient to share work where they have the primary jurisdiction.
Thank you.