As far as I know, web accessibility in Canada is up to each province to legislate. There are several attempt to make websites accessible in government and educational institutions. Most if not all government websites in Canada are now accessible. But unfortunately, there are no laws to ensure that accessibility guidelines are respected.
A special notice should be given to W3Québec. An organization dedicated to promote web accessibility across Québec. Another organization is Accéssibilité Web that have done substantial studies on the matter and have translated WCAG 2.0 in French.
Unlike the US, the Canadian government has yet to make an official law like Section 508. There’s still a ways to get people on board.
If you want to read more on this, check out: http://www.webaccessibility.biz/canada.htm