North Cowichan Water Hardness & Quality Report (2026)
Water Hardness
Source
reservoir
pH Level
7.2
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
54.3 mg/L
Est. Daily Cost
$0.08
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 North Cowichan, your appliances are currently losing 4% efficiency due to mineral buildup.
| Appliance | In North Cowichan | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.6 yrs | 8.5 yrs | — |
| Washing Machine | 12.5 yrs | 12 yrs | — |
| Water Heater | 14.4 yrs | 15 yrs | -4% |
Regional Water Comparison
How North Cowichan compares to its nearest neighbours
| City | Hardness | Mineralization | Risk |
|---|---|---|---|
| ▶ North Cowichan, British Columbia | 29.5 mg/L | Low | 🟢 Soft |
| Duncan, British Columbia | 68.5 mg/L | Medium | 🟡 Moderately Hard |
| North Saanich, British Columbia | 61 mg/L | Medium | 🟡 Moderately Hard |
| Sidney, British Columbia | 64 mg/L | Medium | 🟡 Moderately Hard |
| Central Saanich, British Columbia | 25.5 mg/L | Low | 🟢 Soft |
National Benchmark
How North Cowichan compares to the Canada average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ North Cowichan | 29.5 mg/L | 🟢 None |
| Canada National Avg | 141 mg/L | 🟠 Moderate |
| Vancouver Top Rated | 3 mg/L | 🟢 None |
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What Makes North Cowichan's Water Unique?
Local geology and source profile
North Cowichan's drinking water is managed by the Municipality of North Cowichan (the large municipality surrounding Duncan on Vancouver Island), drawing from the Koksilah River watershed or local Cowichan Valley reservoir supply. Water is treated using UV disinfection, chloramination, and filtration, meeting all Guidelines for Canadian Drinking Water Quality (GCDWQ) requirements. Hardness measures 29.5 mg/L (1.7 gpg) — classified as soft by Health Canada, characteristic of Vancouver Island's predominantly insoluble geological terrain.
North Cowichan's watershed drains the Cowichan Valley highlands — a landscape dominated by Jurassic and Cretaceous volcanic rock (basalts, andesites, and associated tuffs of the Vancouver Island Igneous Complex) and metamorphic formations. These highly insoluble mafic volcanic and metamorphic rock types release minimal dissolved calcium to river water, producing the very soft, low-TDS supply characteristic of all Vancouver Island watershed systems. The 29.5 mg/L is consistent with other Vancouver Island supplies — Campbell River (23.5 mg/L), Chilliwack-Downtown (27 mg/L) — all draining similar insoluble volcanic and metamorphic terrain.
With 29.5 mg/L of hardness, North Cowichan homes are essentially scale-free — appliances and taps require virtually no descaling attention. Hot water tanks have an excellent operational lifespan. The mildly corrosive soft water warrants periodic checking of pipe condition in older homes throughout this rural Vancouver Island community. The Municipality of North Cowichan provides water quality information at northcowichan.ca, and residents are encouraged to follow Health Canada guidance on lead precautionary measures for any pre-1975 properties in the municipality's older communities of Chemainus, Ladysmith fringe, and Duncan-area suburbs.
Geology & Source: Supplied by Municipality of North Cowichan from the Koksilah River or Cowichan Valley watershed reservoirs — water from the Vancouver Island Crystalline terrane's insoluble volcanic and metamorphic bedrock produces very soft water at 29.5 mg/L (1.7 gpg).