By OpenStats · Built from official Canadian sources
Direct municipal dataWater quality grade
Good
Graded against Health Canada drinking water guidelines
St. John’s 25 mg/L hardness is moderate — scale in kettles, not whole-house softener urgency. OpenStats starts with a Denali pitcher for taste, hardness strips, and Frizzlife under-sink NSF 53 in older row housing.
OpenStats pick for St. John's’s 25 mg/L supply — taste, not minerals
Under-sink carbon for St. John's
NSF 53 lead option in St. John's
Baseline St. John's tap water before RO
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Municipal reports cover the plant. A Tap Score kit tests the water at a St. John's tap for a broader contaminant panel.
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Under-sink and RO systems from Waterdrop Canada — a direct brand alternative to marketplace filters.
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St. John's water hardness is 25 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
How St. John's 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: high
Windsor Lake Water Treatment Facility
Treats Broad Cove River / Windsor Lake / Little Powers Pond watershed water; membrane microfiltration, UV, chlorine, lime/CO2 alkalinity adjustment; up to 70,000 m³/day.
Bay Bulls Big Pond Water Treatment Facility
Largest plant; conventional DAF process with UV and chloramine disinfection; up to 85,000 m³/day; also supplies regional partners (e.g. Mount Pearl / Conception Bay South area per provincial inventory).
Petty Harbour Long Pond Water Treatment Facility
Newest city plant; rated about 14,500 m³/day.
Three surface-water plants feed city reservoirs (more than 95,000 m³ storage) and the distribution system. City does not fluoridate. Daily sampling from 70+ distribution locations.
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
Newfoundland and Labrador · 15 cities in sample
Provincial average: hardness 162 mg/L · pH 7.6 · lead 0.4 μg/L · fluoride 0.6 mg/L
| Parameter | Reading | Health Canada guideline | Status |
|---|---|---|---|
| Hardness | 25 mg/L | No health limit (aesthetic) | Compliant |
| pH | 6.9 | 6.5–8.5 | Compliant |
| Lead | 0.2 μg/L | ≤ 5 μg/L | Compliant |
| Fluoride | 0.6 mg/L | ≤ 1.5 mg/L | Compliant |
| Chlorine (free) | 0.7 mg/L | ≤ 4 mg/L | Compliant |
| Turbidity | 2.7 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
St. John’s 25 mg/L hardness is moderate — scale in kettles, not whole-house softener urgency. OpenStats starts with a Denali pitcher for taste, hardness strips, and Frizzlife under-sink NSF 53 in older row housing.
As an Amazon Associate, OpenStats earns from qualifying purchases.
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