Greater Sudbury Water Hardness & Quality Report (2026)
Water Hardness
Source
lake
pH Level
8
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
468 mg/L
Est. Daily Cost
$0.46
energy & soap waste
Source: Health Canada Water Quality · Updated 2026
0–60
mg/L
Soft
61–120
mg/L
Moderately Hard
121–180
mg/L
Hard
180+
mg/L
Very Hard
Appliance Damage Report
In Greater Sudbury, your appliances are currently losing 23% efficiency due to mineral buildup.
| Appliance | In Greater Sudbury | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 3.9 yrs | 8.5 yrs | -54% |
| Washing Machine | 7.2 yrs | 12 yrs | -40% |
| Water Heater | 8.7 yrs | 15 yrs | -42% |
Regional Water Comparison
How Greater Sudbury compares to its nearest neighbours
| City | Hardness | Mineralization | Risk |
|---|---|---|---|
| ▶ Greater Sudbury, Ontario | 173.5 mg/L | Very High | 🟠 Hard |
| Valley East, Ontario | 98 mg/L | Medium | 🟡 Moderately Hard |
| Rayside-Balfour, Ontario | 83 mg/L | Medium | 🟡 Moderately Hard |
| West Nipissing, Ontario | 63 mg/L | Medium | 🟡 Moderately Hard |
| North Bay, Ontario | 45 mg/L | Low | 🟢 Soft |
National Benchmark
How Greater Sudbury compares to the Canada average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Greater Sudbury | 173.5 mg/L | 🟠 Moderate |
| Canada National Avg | 141 mg/L | 🟠 Moderate |
| Vancouver Top Rated | 3 mg/L | 🟢 None |
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What Makes Greater Sudbury's Water Unique?
Local geology and source profile
Greater Sudbury's drinking water is managed by Greater Sudbury Utilities through multiple treatment facilities serving the amalgamated city. The urban core is served by the Ramsey Lake Water Treatment Plant, while the Valley East and northeastern areas receive supply from Lake Wanapitei and local groundwater systems. Treatment includes coagulation, sedimentation, filtration, UV disinfection, and chloramination, meeting all Guidelines for Canadian Drinking Water Quality (GCDWQ) standards. Blended across the municipality, hardness measures 173.5 mg/L (10.1 gpg) — classified as hard by Health Canada, notably elevated for a city situated on the Canadian Shield.
Greater Sudbury sits within the Sudbury Basin — a 1.85-billion-year-old meteorite impact structure with distinctive geology including norite, gabbro, Sudbury Breccia, and Whitewater Group carbonate sedimentary formations at the basin's centre. The Chelmsford Formation and other Whitewater Group carbonates within the basin dissolve into local lake and groundwater supplies, elevating calcium concentrations well above typical Shield levels. Blending of multiple supply zones across the amalgamated city — including harder groundwater-fed areas in former Valley East Township — contributes to the elevated composite hardness measured across the municipality.
At 173.5 mg/L, Greater Sudbury residents experience regular scale build-up on kettle elements, showerheads, and inside hot water tanks — descaling every three to four weeks is typical. Electric hot water tank elements are particularly susceptible to scale at this hardness; annual inspection and flushing are recommended to maintain efficiency and prevent premature failure. A whole-home water softener or electronic scale conditioner is a practical investment for Greater Sudbury households, particularly those with high-efficiency appliances or newer tankless water heating systems.
Geology & Source: Supplied by Greater Sudbury Utilities from Ramsey Lake and Lake Wanapitei — water drawing from the unique geology of the Sudbury Basin meteorite impact structure, including Whitewater Group carbonate formations, produces hard water at 173.5 mg/L (10.1 gpg).