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What is the Cost of a Leak?

By February 3, 2022May 25th, 2022Save Money, Save the Planet, Utility Costs2 min read

Whether we know it or not, leaks are happening at any given moment in a multi-residential building – and those leaks are costly to you, the landlord. As per the EPA, leaks account for an estimated 13% of water bills. 

In total, minor leaks account for one trillion gallons of wasted water every year. That’s equal to the annual household water use for 11 million homes! These leaks can go unreported for a long period of time. Although some leaks can be found audibly or visually, many leaks – especially toilet leaks – are silent and invisible. And even if the leaks are found by tenants, they may not report them.

So just how much are these leaks costing landlords?


At any given moment, 1 in 5 toilets are leaking.

Let’s take a look at a sample multi-residential building that has 300 toilets in the building. If 20% of those are leaking, that’s 60 toilets leaking at any given moment. A moderate toilet leak wastes 6,000 gallons per month. At Toronto water prices of $0.01315679/gal, that’s $79 per month per toilet. If we look at our sample building, that’s $4740 per month that’s lost just from toilet leaks!



It’s estimated that a faucet leaking at a drip rate of one per second will waste 250 gallons of water per month.

If we assume that 1 in 10 faucets have a leak, in our sample building with an average of 3 faucets per unit, that’s 90 faucets leaking 22,500 gallons per month or $296 per month lost to faucet leaks.


A showerhead that has a leak of 10 drops per minute wastes over 500 gallons of water per year, or 41 gallons per month.

If we assume that 1 in 10 showerheads leak in our sample building, that’s 1230 gallons lost each month, equal to $16 per month.

In addition to these common fixtures, there are also outdoor leaks that can occur in a multi-unit residential building’s irrigation system. This is especially true in Canada, when the irrigation systems have to cope with winter frost.

Let’s look back on how much our sample building is spending on leaks each month.

Toilets = 360,000 gallons = $4740 per month

Faucets = 22,500 gallons = $296 per month

Showerheads = 1,230 gallons = $16 per month

Total: $5,052 per month

Per year, that’s $60,624, just on wasted water!

Imagine how that $5,000 per month could be invested into your building. You could invest in low-flow toilets, faucets, and showerheads that could save you even more on your water bill – an estimated 15-40%.

If you’d like to learn more about how you can prevent leaks in your building and save water, contact Connected Sensors today. Our water audit can identify just how much money you can save each month by conserving water.


The Connected Sensors Team. 

Connected Sensors
219 Westcreek Dr,
Woodbridge, ON L4L 9T7

(855) 766-7835

Using a Connected Sensors water management solution, your commercial building can reduce costs, risk of water damage, and improve your carbon footprint, all through one simple, easy to implement system.