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Toxic algae, climate change threaten Canadian water supply

Canada's water under threat

Canada will be up a creek without a paddle if it doesn't acknowledge threats to its fresh water, says a report from some of the country's top water scientists.

"We've enjoyed the luxury of the myth of limitless abundance of fresh water in Canada," said Bob Sandford, a co-author of a report by the Global Water Futures project, which involves 22 universities.

"Canada is not a water-secure country."

Climate change is rapidly outpacing water use policies that haven't changed in decades and the patchwork of rival jurisdictions that create them aren't moving quickly enough to adapt, said co-author Corinne Schuster-Wallace.

"Climate change impacts are accelerating far faster than we ever thought they would. Our water governance policies are fragmented."

As an example, the authors point to eutrophication, a poisoning of lake water by toxic algae that often affects lakes such as Lake Erie and Lake Winnipeg.

The algae have always been around, but the impacts are increasing from growing amounts of agricultural run-off and the gradual warming of lake water from climate change.

"Lakes in Canada are warming at twice the global rate," Sandford said. "Warmer water reduces the threshold it takes ... to produce algal blooms.

"Eutrophication is a problem from coast to coast to coast."

Changing weather patterns also threaten farms. More precipitation is falling as rain instead of snow, which runs off instead of staying on the land.

"Prairie agriculture depends on that snowpack," Schuster-Wallace said.

Cities are threatened too, as glaciers — the water tanks of the Prairies — melt away.

"When you think of our glaciers as our savings account and not our checking account, that's a real problem," said Schuster-Wallace. "Our checking account's looking really flush at the moment. But in 10, 20, 30 years time, our savings account will be gone."

Some watersheds are already overdrawn. Sandford said the South Saskatchewan River, which waters a large stretch of southern Alberta and Saskatchewan, is now over-allocated.

Overall, water quality is slowly degrading. While 112 of 175 Canadian river monitors showed good or excellent water quality, the changes that have appeared show more declines than improvements.

Little is known about many watersheds.

Quality data only exists for 67 of 167 sub-watersheds in Canada. Of those, almost two-thirds are rated fair or poor.

And climate change continues to increase the number of precipitation-based extreme weather events such as floods, damaging homes and other infrastructure.

"We've had three one-in-a-hundred-year events in five years," Schuster-Wallace said.

The Parliamentary Budget Officer says natural disaster relief costs have increased by 660 per cent between 1970 and 2014. The cost from extreme events between 2000 and 2017 exceeds $28 billion.



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