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OpenStats picks for Oakville — moderate hardness
Oakville at 124 mg/L is hard enough for kettle scale but often below whole-house softener urgency. Carbon filtration for taste plus hardness strips before you overspend.
Oakville tap water: Grade B, hardness 124 mg/L
By OpenStats · Built from official Canadian sources
Direct municipal dataB
Water quality grade
Good
Graded against Health Canada drinking water guidelines
Lead within guidelinepH in range
Hardness vs provincial average124 mg/L · prov. avg 178 mg/L
Lead vs provincial average0.3 μg/L · prov. avg 0.4 μg/L
Hardness
124 mg/L
Lead
0.3 μg/L
≤ 5 μg/L
pH
7.6
6.5–8.5 range
Hardness
124 mg/L
Hard
Lead
0.3 μg/L
Max: 5 μg/L
pH
7.6
6.5–8.5
Chlorine
0.8 mg/L
Max: 4 mg/L
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Reading this page
Oakville water hardness is 124 mg/L with pH 7.6.
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
Supply and treatment
How Oakville 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.
Source type
Surface water
Research confidence: high
Source waters
- Lake Ontario
Treatment plants
Oakville Water Treatment Plant
Halton Region conventional filtration plant at 21 Kerr Street; sand-ballasted clarification. Rated capacity on the order of 109 ML/d.
Burloak Water Treatment Plant
Halton Region membrane plant at 3380 Rebecca Street, Oakville; flocculation, ultrafiltration, optional UV, ozonation, fluoridation, and chlorination.
Distribution
Treated water enters the interconnected Halton Region Distribution Subsystem (South Halton), which also serves Burlington and parts of Milton and Halton Hills.
Health parameters meet Health Canada limits; turbidity above the 1 NTU typical target.
Health parameters meet Health Canada limits; turbidity exceeds the typical 1 NTU aesthetic target.
Figure 1 · Supply chain
From watershed to tap
Compared to provincial average
Ontario · 123 cities in sample
Hardness (city vs Ontario avg)124 mg/L
pH (city vs Ontario avg)7.6
Lead (city vs Ontario avg)0.3 μg/L
Fluoride (city vs Ontario avg)0.7 mg/L
Provincial average: hardness 178 mg/L · pH 7.5 · lead 0.4 μg/L · fluoride 0.6 mg/L
Full parameters
| Parameter | Reading | Health Canada guideline | Status |
|---|---|---|---|
| Hardness | 124 mg/L | No health limit (aesthetic) | Compliant |
| pH | 7.6 | 6.5–8.5 | Compliant |
| Lead | 0.3 μg/L | ≤ 5 μg/L | Compliant |
| Fluoride | 0.7 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 →OpenStats pick
OpenStats picks for Oakville — moderate hardness
Oakville at 124 mg/L is hard enough for kettle scale but often below whole-house softener urgency. Carbon filtration for taste plus hardness strips before you overspend.
As an Amazon Associate, OpenStats earns from qualifying purchases.
· Compare options- Shop on Amazon.caBrita Denali pitcherOpenStats pick for Oakville at 124 mg/L — everyday chlorine taste
- Shop on Amazon.caWaterdrop 15UA under-sink filterSkip the pitcher wait in Oakville
- Shop on Amazon.caVARIFY hardness test stripsConfirm 124 mg/L before a softener
- Shop on Amazon.caBrita replacement filtersRecurring cartridge supply
Source · Halton Region distribution system 2025 analytical averages. Last updated 2026-10-07. Refreshed on the site's automated schedule.