OTTAWA -- The amount Canadians owe compared with how much they earn hit a new record in the second quarter, driven in part by the country's hot housing markets.

TD Bank senior economist Leslie Preston said low interest rates have made borrowing more attractive, especially for homebuyers, and predicted the debt ratio could continue to trend a little higher in the next few quarters.

"We think there's still a fair bit of momentum in Toronto's housing market and Toronto is just such a huge share of Canada's overall housing market that we do think this ratio could tick up," she said Thursday.

The ratio of household debt to disposable income rose to 169.85 per cent in the second quarter from 167.37 per cent in the previous quarter. That means Canadians had nearly $1.70 of debt for every dollar of disposable income.

The growth came as household credit market debt climbed two per cent, while disposable income increased 0.5 per cent in the quarter.

BMO Capital Markets senior economist Benjamin Reitzes said the increase in the debt ratio was consistent with a usual seasonal trend -- with the second quarter the strongest period for housing markets and thus mortgage debt growth.

"While it looks as though the Vancouver housing market is cooling after the foreign buyers' tax was implemented, the Toronto market remains very strong, and others are showing signs of improving as well," Reitzes said.

The Bank of Canada has identified household debt as a key risk to the economy.

In its latest interest rate announcement, the central bank said "financial vulnerabilities associated with household imbalances remain elevated and continue to rise."

Scott Hannah, chief executive of the Credit Counselling Society, said when interest rates are low it's tempting to buy things on credit, but interest rates will rise eventually.

"If we're already struggling to manage our debts now, things are only going to get more challenging when the cost of borrowing rises," Hannah said.

A recent report by credit reporting agency TransUnion suggested up to one million Canadian borrowers, including some of the highest rated consumers, could face problems paying their debts if interest rates rise.

TransUnion said that while the majority of Canadians will not be materially impacted in the near term by an interest rate increase, there is a "material subset."

Total household credit market debt -- which includes consumer credit, and mortgage and non-mortgage loans -- was $1.973 trillion at the end of the second quarter, including $585.8 billion in consumer credit and $1.293 trillion in mortgage debt.

Reitzes noted that Canadian household debt rose above 100 per cent of nominal gross domestic product for the first time.

Total household net worth increased 1.9 per cent in the second quarter to $9.837 trillion, boosted by a gain in real estate. Household net worth on a per capita basis was $271,300.

The ratio of household debt to assets was 16.9 per cent, relatively unchanged from the previous quarter, suggesting Canadian households had $5.92 of assets for every dollar of debt.