Longueuil Drinking Water Quality
By Canadian Water Quality Data Team · Sourced from official open data
Direct municipal dataGrade B · GoodB
Health parameters compliant; minor aesthetic factors such as hardness or pH near guideline edges.
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Hardness
181 mg/L
Very hard
pH
7.9
Guideline: 6.5–8.5
Lead
0.5 μg/L
Max: 5 μg/L
Fluoride
0.7 mg/L
Max: 1.5 mg/L
Summary
Longueuil's drinking water earns Grade B (Good). Hardness is 181 mg/L (very hard). pH 7.9 against Health Canada's 6.5–8.5 guideline. Lead at 0.5 μg/L is below the 5 μg/L maximum.
Compared to provincial average
Quebec · 34 cities in sample
Hardness (city vs Quebec avg)181 mg/L
pH (city vs Quebec avg)7.9
Lead (city vs Quebec avg)0.5 μg/L
Fluoride (city vs Quebec avg)0.7 mg/L
Provincial average: hardness 186 mg/L · pH 7.5 · lead 0.3 μg/L · fluoride 0.6 mg/L
Full parameters
| Parameter | Reading | Health Canada guideline | Status |
|---|---|---|---|
| Hardness | 181 mg/L | No health limit (aesthetic) | Compliant |
| pH | 7.9 | 6.5–8.5 | Compliant |
| Lead | 0.5 μg/L | ≤ 5 μg/L | Compliant |
| Fluoride | 0.7 mg/L | ≤ 1.5 mg/L | Compliant |
| Chlorine (free) | 1 mg/L | ≤ 4 mg/L | Compliant |
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Source · ECCC / municipal open data (seed). Last updated 2026-06-28. Refreshed on the site's automated schedule.
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