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OpenStats picks for Lethbridge — moderate hardness
Lethbridge at 151 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.
Lethbridge tap water: Grade B, hardness 151 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 average151 mg/L · prov. avg 178 mg/L
Lead vs provincial average0 μg/L · prov. avg 0.3 μg/L
Hardness
151 mg/L
Lead
0 μg/L
≤ 5 μg/L
pH
7.9
6.5–8.5 range
Hardness
151 mg/L
Hard
Lead
0 μg/L
Max: 5 μg/L
pH
7.9
6.5–8.5
Chlorine
0.5 mg/L
Max: 4 mg/L
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Reading this page
Lethbridge water hardness is 151 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 Lethbridge 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
- Oldman River
Treatment plants
Lethbridge Water Treatment Plant
East bank of the Oldman River south of Whoop-Up Drive; conventional surface-water treatment (coagulation, sedimentation, filtration, disinfection). City states it does not use groundwater wells for the municipal supply.
Distribution
Plant produces tens of millions of litres per day on average for Lethbridge and regional customers; capacity upgrades are underway to raise maximum daily throughput for southern Alberta growth.
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
Alberta · 51 cities in sample
Hardness (city vs Alberta avg)151 mg/L
pH (city vs Alberta avg)7.9
Lead (city vs Alberta avg)0 μg/L
Fluoride (city vs Alberta avg)0.7 mg/L
Provincial average: hardness 178 mg/L · pH 7.5 · lead 0.3 μg/L · fluoride 0.6 mg/L
Full parameters
| Parameter | Reading | Health Canada guideline | Status |
|---|---|---|---|
| Hardness | 151 mg/L | No health limit (aesthetic) | Compliant |
| pH | 7.9 | 6.5–8.5 | Compliant |
| Lead | 0 μg/L | ≤ 5 μg/L | Compliant |
| Fluoride | 0.7 mg/L | ≤ 1.5 mg/L | Compliant |
| Chlorine (free) | 0.5 mg/L | ≤ 4 mg/L | Compliant |
| Turbidity | 1.7 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 Lethbridge — moderate hardness
Lethbridge at 151 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 Lethbridge at 151 mg/L — everyday chlorine taste
- Shop on Amazon.caWaterdrop 15UA under-sink filterSkip the pitcher wait in Lethbridge
- Shop on Amazon.caVARIFY hardness test stripsConfirm 151 mg/L before a softener
- Shop on Amazon.caBrita replacement filtersRecurring cartridge supply
Source · City of Lethbridge water treatment plant quarterly water quality summaries. Last updated 2026-10-07. Refreshed on the site's automated schedule.