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Laval 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 average253 mg/L · prov. avg 183 mg/L
Lead vs provincial average0.5 μg/L · prov. avg 0.3 μg/L
Hardness
253 mg/L
Lead
0.5 μg/L
≤ 5 μg/L
pH
7.1
6.5–8.5 range
Hardness
253 mg/L
Very hard
Lead
0.5 μg/L
Max: 5 μg/L
pH
7.1
6.5–8.5
Chlorine
1 mg/L
Max: 4 mg/L
From source to sink
Where Laval 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 Laval water lives
Source waters and treatment plants pinned from published utility names. Open a pin below for the full OpenStreetMap view.
- CityLaval
Municipal service area
- Source waterRivière des Prairies
Source water
- Source waterRivière des Mille-Îles
Source water
- Treatment plantStation de Chomedey
Approximate pin near Laval (exact plant coordinates pending)
- Treatment plantStation de Pont-Viau
Approximate pin near Laval (exact plant coordinates pending)
- Treatment plantStation de Sainte-Rose
Approximate pin near Laval (exact plant coordinates pending)
Map data © OpenStreetMap contributors. Pins are approximate for orientation, not legal survey points.
Where it starts
Surface water
Research confidence: high
Named source waters
- Rivière des Prairies
- Rivière des Mille-Îles
Treatment plants
Station de Chomedey
Largest Laval plant; draws from Rivière des Prairies; can backfeed other sectors in emergency.
Station de Pont-Viau
East/central plant on Rivière des Prairies corridor; major upgrades completed mid-2010s.
Station de Sainte-Rose
Northern plant on Rivière des Mille-Îles side of Île Jésus.
How it reaches your street
Three production stations feed about 1,650 km of distribution mains. The network is meshed so plants primarily serve their sectors but can support each other if one plant is offline.
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Partner
Lab water test for Laval taps
Municipal reports cover the plant. A Tap Score kit tests the water at a Laval tap for a broader contaminant panel.
Lab kit partner link. We may earn a commission when tracking is active.
Reading this page
Laval's most recent drinking water sample (2026-07-22) reports hardness of 253 mg/L, classified as very hard, and pH 7.1, drawn from a surface water source and treated at Laval Water Treatment Plant. Lead measured 0.5 μg/L and fluoride 0.5 mg/L.
Free chlorine measured 1 mg/L in this sample. No E. coli was detected in this sample.
Laval's hardness of 253 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)253 mg/L
pH (city vs Quebec avg)7.1
Lead (city vs Quebec avg)0.5 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 | 253 mg/L | No health limit (aesthetic) | Compliant |
| pH | 7.1 | 6.5–8.5 | Compliant |
| Lead | 0.5 μg/L | ≤ 5 μg/L | Compliant |
| Fluoride | 0.5 mg/L | ≤ 1.5 mg/L | Compliant |
| Chlorine (free) | 1 mg/L | ≤ 4 mg/L | Compliant |
| Turbidity | 1.4 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.
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- 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.