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Drinking Water Quality and Supply

Whitby tap water: Grade C, hardness 125 mg/L

By OpenStats · Built from official Canadian sources

Direct municipal data
C

Water quality grade

Fair

Graded against Health Canada drinking water guidelines

Lead within guidelinepH in range
Hardness vs provincial average125 mg/L · prov. avg 178 mg/L
Lead vs provincial average0.7 μg/L · prov. avg 0.4 μg/L
Hardness
125 mg/L
Lead
0.7 μg/L
≤ 5 μg/L
pH
7.4
6.5–8.5 range
Hardness
125 mg/L
Hard
Lead
0.7 μg/L
Max: 5 μg/L
pH
7.4
6.5–8.5
Chlorine
1.2 mg/L
Max: 4 mg/L
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Compare filters · Water test kits · Hardness guide

Reading this page

Whitby water hardness is 125 mg/L, from the city's published water quality reporting.

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 Whitby 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: medium

Source waters

  • surface

Treatment plants

  • Whitby Water Treatment Plant

    From municipal open data or regional estimate (verify locally).

Cited sources

Outbound municipal or utility citations pending. See methodology for how supply research is gathered.

Supply notes summarize published utility materials. They are not a substitute for the issuing authority's current notices or for a licensed tap test.

Health parameters meet Health Canada limits; turbidity above the 1 NTU typical target.

One or more parameters exceed a Health Canada drinking water guideline or turbidity target.

Figure 1 · Supply chain

From watershed to tap

Compared to provincial average

Ontario · 123 cities in sample

Hardness (city vs Ontario avg)125 mg/L
pH (city vs Ontario avg)7.4
Lead (city vs Ontario avg)0.7 μg/L
Fluoride (city vs Ontario avg)0.5 mg/L

Provincial average: hardness 178 mg/L · pH 7.5 · lead 0.4 μg/L · fluoride 0.6 mg/L

Full parameters

ParameterReadingHealth Canada guidelineStatus
Hardness125 mg/LNo health limit (aesthetic)Compliant
pH7.46.5–8.5Compliant
Lead0.7 μg/L≤ 5 μg/LCompliant
Fluoride0.5 mg/L≤ 1.5 mg/LCompliant
Chlorine (free)1.2 mg/L≤ 4 mg/LCompliant
Turbidity3.2 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 Whitby — chlorine + hardness

Whitby pairs 125 mg/L hardness with 1.2 mg/L chlorine — taste and scale show up together. Elite carbon for drinking, shower filter for chlorine, strips so you know when you need a softener.

As an Amazon Associate, OpenStats earns from qualifying purchases.

· Compare options

  • Brita 10-cup Elite pitcher
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  • Frizzlife SW20 under-sink filter
    NSF 53 lead reduction for Whitby older plumbing
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  • Brita Elite replacement filters
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  • VARIFY hardness test strips
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Source · Region of Durham About Water (hardness table). Last updated 2026-10-07. Refreshed on the site's automated schedule.