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Toronto Drinking Water Quality

By OpenStats · Built from official Canadian sources

Direct municipal data
C

Water quality grade

Fair

Graded against Health Canada drinking water guidelines

Lead within guidelinepH in range
Hardness vs provincial average121 mg/L · prov. avg 182 mg/L
Lead vs provincial average0.5 μg/L · prov. avg 0.4 μg/L
Hardness
121 mg/L
Lead
0.5 μg/L
≤ 5 μg/L
pH
7.5
6.5–8.5 range
Hardness
121 mg/L
Hard
Lead
0.5 μg/L
Max: 5 μg/L
pH
7.5
6.5–8.5
Chlorine
1 mg/L
Max: 4 mg/L

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Reading this page

Toronto's most recent drinking water sample (2026-07-22) reports hardness of 121 mg/L, classified as hard, and pH 7.5, drawn from a groundwater water source and treated at Toronto Water Treatment Plant. Lead measured 0.5 μg/L and fluoride 0.6 mg/L.

Free chlorine measured 1 mg/L in this sample. No E. coli was detected in this sample.

Toronto's hardness of 121 mg/L is below the Ontario average of 182 mg/L across 51 tracked municipalities, with a provincial average pH of 7.5.

These readings summarize a single compliance snapshot, not a certification of the water reaching your tap. Test your own water periodically, especially on a private well, and consider a softener if hardness is classified hard or very hard.

How to use this page: read the headline metric and provincial comparison first, then the source footer for the underlying dataset.

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.

Source: groundwater · Toronto Water Treatment Plant

Figure 1 · Supply chain

From watershed to tap

Compared to provincial average

Ontario · 51 cities in sample

Hardness (city vs Ontario avg)121 mg/L
pH (city vs Ontario avg)7.5
Lead (city vs Ontario avg)0.5 μg/L
Fluoride (city vs Ontario avg)0.6 mg/L

Provincial average: hardness 182 mg/L · pH 7.5 · lead 0.4 μg/L · fluoride 0.6 mg/L

Full parameters

ParameterReadingHealth Canada guidelineStatus
Hardness121 mg/LNo health limit (aesthetic)Compliant
pH7.56.5–8.5Compliant
Lead0.5 μg/L≤ 5 μg/LCompliant
Fluoride0.6 mg/L≤ 1.5 mg/LCompliant
Chlorine (free)1 mg/L≤ 4 mg/LCompliant
Turbidity3.8 NTU≤ 1 NTU (typical target)Exceeds guideline
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Source · City of Toronto drinking water analysis summary. Last updated 2026-07-22. Refreshed on the site's automated schedule.