Impossible to believe they aren't allowed. I've had one in 5 of 7 of the homes I've lived in over the past 30 years. There's nothing inherently "unCanadian" about a garburator.
Heck, we even have our own word for it! None of my US friends/colleagues had heard the word "garburator" when I used it (they tend to call it "garbage disposal"). Google told me that it was a Canadian term (though, of course, my US sample is small, so may be some Americans do call it a "garburator").
Wikipedia (I know) agrees that it is a Canadian term. Also, that they are more common in the US than other countries.
https://en.wikipedia.org/wiki/Garbage_disposal_unit
A garbage disposal unit (also known as a garbage disposal, waste disposal unit, garbage disposer, or in Canadian English a garburator) is a device, usually electrically powered, installed under a kitchen sink between the sink's drain and the trap. The disposal unit shreds food waste into pieces small enough—generally less than 2 mm (0.079 in)—to pass through plumbing.[1]
Garbage disposal units are used extensively in United States households, but are far less common elsewhere.
Definitely had them in Canadian places that I lived but a lower percentage than in the US places I lived. Don't think I've seen one yet in Switzerland (but I've not looked in many houses/apartments).
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