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Terrebonne Drinking Water Quality
By OpenStats · Built from official Canadian sources
Regional estimateB
Water quality grade
Good
Graded against Health Canada drinking water guidelines
Lead within guidelinepH in range
Hardness vs provincial average259 mg/L · prov. avg 183 mg/L
Lead vs provincial average0.3 μg/L · prov. avg 0.3 μg/L
Hardness
259 mg/L
Lead
0.3 μg/L
≤ 5 μg/L
pH
7.7
6.5–8.5 range
Hardness
259 mg/L
Very hard
Lead
0.3 μg/L
Max: 5 μg/L
pH
7.7
6.5–8.5
Chlorine
0.8 mg/L
Max: 4 mg/L
From source to sink
Where Terrebonne water comes from
Lakes, rivers, wells, and treatment plants behind the kitchen tap, in plain language. Chemistry grades above are a separate lab snapshot; this section is the route the water travels.
Open the full tap storyOn the map
Where Terrebonne water lives
Source waters and treatment plants pinned from published utility names. Open a pin below for the full OpenStreetMap view.
- CityTerrebonne
Municipal service area
- Source waterRivière des Mille Îles
Source water
- Treatment plantRégie d’aqueduc intermunicipale des Moulins (RAIM) production plant
Approximate pin near Terrebonne (exact plant coordinates pending)
Map data © OpenStreetMap contributors. Pins are approximate for orientation, not legal survey points.
Where it starts
Surface water
Research confidence: medium
Named source waters
- Rivière des Mille Îles
Treatment plants
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.
How it reaches your street
RAIM produces and transmits; Terrebonne and Mascouche handle local distribution within their territories under the régie model.
SponsoredAlso consider
Whole-house water softener
Best for hardness ≥ 180 mg/L
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Confirm mg/L before sizing a unit
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Partner
Lab water test for Terrebonne taps
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.
Reading this page
Terrebonne's most recent drinking water sample (2026-07-22) reports hardness of 259 mg/L, classified as very hard, and pH 7.7, drawn from a surface water source and treated at Terrebonne Water Treatment Plant. Lead measured 0.3 μg/L and fluoride 0.5 mg/L.
Free chlorine measured 0.8 mg/L in this sample. No E. coli was detected in this sample.
Terrebonne's hardness of 259 mg/L is above the Quebec average of 183 mg/L across 34 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 metrics first, then where the water comes from (map and tap story), then the parameter table and source footer.
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 · From source to sink
How drinking water reaches your tap
Compared to provincial average
Quebec · 34 cities in sample
Hardness (city vs Quebec avg)259 mg/L
pH (city vs Quebec avg)7.7
Lead (city vs Quebec avg)0.3 μg/L
Fluoride (city vs Quebec avg)0.5 mg/L
Provincial average: hardness 183 mg/L · pH 7.5 · lead 0.3 μg/L · fluoride 0.6 mg/L
Full parameters
| 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 |
Alberta water licences
WaterRegister.ca
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 →Water softeners for hard water
Very hard water. Whole-house softeners are the high-ticket fit; salt and test kits support the install.
As an Amazon Associate, OpenStats earns from qualifying purchases.
· Compare options- Shop on Amazon.caWhole-house water softenerBest for hardness ≥ 180 mg/L
- Shop on Amazon.caSoftener saltOngoing supply (high repurchase)
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- Shop on Amazon.caWater hardness test stripsConfirm mg/L before sizing a unit
- Shop on Amazon.caTDS meterQuick dissolved-solids check
Source · ECCC / municipal open data (seed). Last updated 2026-07-22. Refreshed on the site's automated schedule.