The latest regulations for the Canada Shipping Act 2001 are posted here:
The requirements for sewage containment onboard, and transfer off, pleasure craft are included. Boats operating on Sylvan Lake are expected to comply with the law.
That’s a hard to do when the only commercial marina on the lake has no capability to pump out marine holding tanks. Vacuum truck service is available however that is a rare practice in the rest of the boating world.