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Currently you are able to watch "H2O: Mermaid Adventures - Season 1" streaming on Netflix, Amazon Prime Video, Netflix basic with Ads, Amazon Prime Video with Ads.
There are no options to watch H2O: Mermaid Adventures for free online today in Canada. You can select 'Free' and hit the notification bell to be notified when season is available to watch for free on streaming services and TV.
Season 1 sees Rikki, Emma and Cleo solve underwater mysteries, rescue sea turtles and baby whales, and even save Mako Island from ruin.