Hayley Todesco's project beat all the other submissions from 17- and 18-year-old students around the world at the Google Science Fair.
It's Todesco's second big award win this month.
On Sept. 3, she received the 2014 Stockholm Junior Water Prize for her oilsands research, which came with a $15,000 award and $5,000 for her school.
This is the second year in a row that a Canadian won a top prize at the Google Science Fair.
Last year, Victoria's Ann Makosinski, who was 15, won in her age group for her project, a flashlight powered by body heat.
Hayley Todesco's project: Waste to Water: Biodegrading Napthenic Acids Using Novel Sand Bioreactors.
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