I think the logic is that the swift moving currents and deep ocean depths off the west coast of Vancouver island means that the sewage is quickly dispersed and diluted, so it becomes such a small part of the overall ocean that there aren't any harms associate with having a build up of sewage in, say, a confined bay. Said another way, you aren't going to have the same problems with disease and the growth of unwanted flora and fauna since it all gets swept down the west coast towards the US and quickly becomes very diliuted.
And yes, basically every ocean going ship dumps raw sewage in the ocean once it's far enough off shore (about 3 miles). They also tend to just throw their garbage overboard.
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