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Millions of cubic metres of drinking water being wasted due to leaky pipes: RCCAO report

June 14, 2021  By Ground Water Canada

Vaughan, Ont. – Millions of cubic metres of treated drinking water are being pumped into the ground every year across Ontario municipalities as a result of leaky and broken pipes, according to a new study by the Residential and Civil Construction Alliance of Ontario.

The study indicates that many Ontario municipalities report an estimated leakage rate of at least 10 per cent. However, it also notes that reports by consultants who conducted actual assessments show that rates in Ontario could be as high as nearly 40 per cent.

One analysis for the Town of Smiths Falls estimated that rates between 2003 and 2019 ranged between 41 per cent and 67 per cent. The City of Toronto has consistently reported a leakage rate of 10-15 per cent, the study notes, which means it wastes 103 million litres per day. The volume of losses is equivalent to supplying the daily demand of a system servicing a population of about 250,000 people or filling more than 15,000 Olympic-sized swimming pools every year.


The study, titled Water Infrastructure in the 21st Century: Smart and Climate-Savvy Asset Management Policies, was done by Tamer E. El-Diraby, a professor in the department of civil and mineral engineering at the University of Toronto. It is a followup to a similar study El-Diraby did for RCCAO in 2009.

“The findings of this study are alarming because they confirm that our water infrastructure is aging and in dire need of repair,” says RCCAO executive director Nadia Todorova. “Governments must provide sustained funding to fix and replace these critical infrastructure assets. It’s incredibly inefficient and almost singlehandedly defeating our water conservation goals when treated drinking water never makes it to the taps because of leaky pipes.”

Addressing water leakage has many benefits and potential for cost savings. For example, the study found that fixing leakage in a single section of the water system in York Region saved 139,000 cubic metres a year in water, or the equivalent of 75 elevated tanks, and also $426,000 annually in cost as well as 102 megawatt hours a year in energy (enough to power 11 homes for a year) and 4.1 tonnes of CO2 for the year.

The study looks at reasons for the leakage, analyze sthe means available to detect and forecast them, and makes the economic and environmental case for sustained investment in water infrastructure.


The study recommended that:

  • Ontario stay the course and continue to provide funds for asset management projects.
  • Stable funding be allocated to support an extended asset-energy-carbon analysis that will define the return-on-investment beyond the financial aspects of asset management projects.
  • Money be provided for municipalities to adopt best practices, lead innovation, and develop accountable plans for investment and performance optimization.

“It is imperative that Ontario stay the course to preserve the value of its water infrastructure assets as well as embrace new asset management practices to make the infrastructure more resilient,” says Prof. El-Diraby. “We must pivot to face future challenges. If we let our guard down, the repercussions will be much higher than the simple issue of crumbling assets and lower levels of services.”

Life of a watermain assumed to be 110-166 years

While there has been significant progress in asset managment awareness and mastery of best practices in Ontario, the study found there is more work that needs to be done. For example, in 2018 a survey of 308 water utilities in North America showed that the typical age of a failing watermain is 50 years. That failure age is disturbing because about 28 per cent of all watermains have an age of 50 years or older. The study notes that, in Toronto, 16 per cent of the more than 6,000 kilometres of watermains are 80-100 years of age and 11 per cent are more than 100 years old. The city experiences an average of 1,400 watermain breaks annually and replaces about 35 to 50 kilometres of watermains each year, meaning it’s working on the assumption that the service life of a watermain is 110-166 years.

Click here to read the study.


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