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Water hardness varies by neighbourhood in your city.
💡 For exact results, we recommend a professional water test.
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Water hardness varies dramatically across Canada — from extremely soft water on the Pacific coast to some of the hardest municipal water in North America across the Prairies and parts of southern Ontario. Hardness is measured in grains per gallon (GPG) or milligrams per litre (mg/L) of calcium carbonate, where 1 GPG equals 17.1 mg/L.
Cities drawing from Great Lakes or mountain reservoirs typically have softer water. Cities drawing from groundwater wells or rivers flowing through limestone bedrock — which covers much of southern Ontario, the Prairies, and parts of Quebec — tend to have harder water. Kitchener, Waterloo, Cambridge, Guelph, Brampton, Mississauga, Barrie, Calgary, Edmonton, Regina, Saskatoon, and Winnipeg are among the Canadian cities with notably hard water.
Hard water isn't a health risk, but it damages your home and appliances over time. The calcium and magnesium minerals precipitate out as scale — the white crusty buildup you see on faucets, inside kettles, and on shower doors. That same scale forms inside your water heater, dishwasher, washing machine, and plumbing.
A properly sized water softener eliminates these issues by removing the calcium and magnesium before they reach your plumbing.
Below 3.5 GPG is considered soft or slightly hard and no softener is needed. 3.5–7 GPG is moderately hard — optional treatment. 7–10.5 GPG is hard. Above 10.5 GPG is very hard — a softener makes a significant difference to your home and daily life.
Canadian municipal water is disinfected with chlorine. Typical residuals are 0.05–2.0 mg/L at the tap. You may notice a pool-like taste or smell, especially when water sits in pipes. A whole-home chlorine filter removes the taste while keeping your plumbing protected.
TDS measures the overall mineral content. Canadian municipal water is typically below 500 mg/L. Higher TDS can affect taste and indicate the presence of other contaminants worth looking at.
Most city supplies remove these, but some areas still show trace levels. Iron above 0.3 mg/L causes orange/brown staining on fixtures and laundry. Manganese above 0.05 mg/L causes black/dark staining.
Ideal pH is 6.5–8.5. Outside this range your water can corrode pipes (low pH) or leave chalky deposits (high pH).
We use published municipal water quality data for over 500 Canadian cities to estimate your water hardness and typical treatment needs. Enter your city, tell us about your household, and you'll get an instant analysis with recommendations sized for your home.
For confirmed numbers specific to your tap, we always recommend a professional water test — especially if you're considering installing treatment equipment.
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