By OpenStats · Built from official Canadian sources
Regional estimateWater quality grade
Good
Graded against Health Canada drinking water guidelines
Terrebonne hardness is 259 mg/L — pitcher filters improve taste but will not soften water. Size a metered whole-house softener for scale, and add under-sink carbon for drinking chlorine.
OpenStats pick for Terrebonne’s 259 mg/L hardness — metered whole-house softener sized for very hard Canadian tap water
Terrebonne: under-sink carbon for drinking water (chlorine 0.8 mg/L) — does not remove hardness minerals
Optional shower carbon for Terrebonne if chlorine taste bothers you
Verify 259 mg/L hardness at your tap before buying salt and sizing a softener
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Municipal reports cover the plant. A Tap Score kit tests the water at a Terrebonne tap for a broader contaminant panel.
Lab kit partner link. We may earn a commission when tracking is active.
Terrebonne's drinking water earns Grade B (Good). Hardness is 259 mg/L (very hard), and pH is 7.7 against Health Canada's 6.5–8.5 guideline.
Lead at 0.3 μg/L is below the 5 μg/L maximum, and fluoride is 0.5 mg/L against a guideline of ≤ 1.5 mg/L.
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 Terrebonne 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: medium
Régie d’aqueduc intermunicipale des Moulins (RAIM) production plant
Intermunicipal utility serving Terrebonne and Mascouche; surface supply from the Mille Îles River corridor. RAIM reports roughly 21 million m³/year across the two-city service area.
RAIM produces and transmits; Terrebonne and Mascouche handle local distribution within their territories under the régie model.
Health parameters meet Health Canada limits; turbidity above the 1 NTU typical target and very hard water.
Health parameters meet Health Canada limits; turbidity exceeds the typical 1 NTU aesthetic target.
Figure 1 · Supply chain
From watershed to tap
Quebec · 34 cities in sample
Provincial average: hardness 183 mg/L · pH 7.5 · lead 0.3 μg/L · fluoride 0.6 mg/L
| Parameter | Reading | Health Canada guideline | Status |
|---|---|---|---|
| Hardness | 259 mg/L | No health limit (aesthetic) | Compliant |
| pH | 7.7 | 6.5–8.5 | Compliant |
| Lead | 0.3 μg/L | ≤ 5 μg/L | Compliant |
| Fluoride | 0.5 mg/L | ≤ 1.5 mg/L | Compliant |
| Chlorine (free) | 0.8 mg/L | ≤ 4 mg/L | Compliant |
| Turbidity | 2 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
Terrebonne hardness is 259 mg/L — pitcher filters improve taste but will not soften water. Size a metered whole-house softener for scale, and add under-sink carbon for drinking chlorine.
As an Amazon Associate, OpenStats earns from qualifying purchases.
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