>

There's your problem. Orcas should be in the ocean, not in Canada.
These chemicals have been found in measurable quantities in the far north of Canada and in the systems of people living there. This shit is pretty much everywhere...as are micro-plastics. >

It’s in the rain water everywhere on earth >

News flash: That stuff is everywhere. >

Orcas are on the peak of the food chain.  Even humans won’t eat them. Orcas accumulate all contaminants from all underneath them. >

Humans would, if we could. Whale hunting is hard and illegal in most places. 
Orcas and humans are both apex predators. It's safe to assume what's affecting them is also affecting us. >

Orcas are extremely toxic.  Their carcasses are treated as toxic sites and need hazmat treatment. Bon appetite.