The treaty mentioned:

https://www.gsgp.org/media/nvzkrpyv/great_lakes-st_lawrence_...

The US imposes treaties, it doesn't follow them, and Canada is a national security threat, so any treaty requirements can be ignored for national security purposes

Yes, hence why I said "remains a worry". Though the treaty is signed between various states on the US side, too, and some US states have interests that compete with others on these matters that might be the one thing that saves us here in Ontario & Quebec.