By OpenStats · Built from official Canadian sources
Direct municipal dataWater quality grade
Fair
Graded against Health Canada drinking water guidelines
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Municipal reports cover the plant. A Tap Score kit tests the water at a Vaughan tap for a broader contaminant panel.
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Vaughan water hardness is 128 mg/L, from the city's published water quality reporting.
How to use this page: read the headline metric and provincial comparison first, then supply and treatment notes, then the source footer for the underlying dataset.
Watershed to tap
How Vaughan draws, treats, and distributes drinking water, from municipal and utility publications. Chemistry grades above come from separate parameter records; this section does not invent plant lab figures.
Surface water
Research confidence: high
City of Toronto and Region of Peel treatment plants (wholesale) — York Region supply
Vaughan’s primary supply is Lake Ontario water purchased through York Region from Toronto and Peel. Kleinburg is operated as a distinct York sub-system within Vaughan.
York Region transmission feeds Vaughan storage and booster facilities; the City of Vaughan operates the local distribution network.
Health parameters meet Health Canada limits; turbidity above the 1 NTU typical target.
One or more parameters exceed a Health Canada drinking water guideline or turbidity target.
Figure 1 · Supply chain
From watershed to tap
Ontario · 123 cities in sample
Provincial average: hardness 178 mg/L · pH 7.5 · lead 0.4 μg/L · fluoride 0.6 mg/L
| Parameter | Reading | Health Canada guideline | Status |
|---|---|---|---|
| Hardness | 128 mg/L | No health limit (aesthetic) | Compliant |
| pH | 6.9 | 6.5–8.5 | Compliant |
| Lead | 0.4 μg/L | ≤ 5 μg/L | Compliant |
| Fluoride | 0.6 mg/L | ≤ 1.5 mg/L | Compliant |
| Chlorine (free) | 0.9 mg/L | ≤ 4 mg/L | Compliant |
| Turbidity | 3.7 NTU | ≤ 1 NTU (typical target) | Exceeds guideline |
On a private well or holding an Alberta water allocation licence? Water Register maps EPA licence records, transfer comparables, and watershed context across the province.
Explore WaterRegister.ca →OpenStats pick
Vaughan pairs 128 mg/L hardness with 0.9 mg/L chlorine — taste and scale show up together. Elite carbon for drinking, shower filter for chlorine, strips so you know when you need a softener.
As an Amazon Associate, OpenStats earns from qualifying purchases.
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