Water hardness in Comox
18 mg/L soft
Tap water in Comox is soft: 18 mg/L (1 gpg · 1 °dH · 1.8 °fH).
Source: CVRD, Annual Drinking Water Report 2025 - Comox Valley Water System (2025) · data checked 2026-11-02
Range across supply zones: 17–19 mg/L.
Comox is served by the Comox Valley Regional District's water system. The 2025 annual report lists four total hardness results from 16.9 to 19 mg/L as CaCO3, and the figure shown is the midpoint. The report prints the unit as ug/L, which is a typo; the values are clearly mg/L. The water is very soft, so scale is rarely a problem.
Health Canada: hardness above 200 mg/L is considered poor but tolerable; above 500 mg/L unacceptable.
Water data
| Total hardness | 18 mg/L |
|---|---|
| Utility | Comox Valley Regional District (Comox Valley Water System) |
How Comox compares
- Tap water in Comox is 82 % softer than the median of the 254 cities we track in Canada (101 mg/L).
- By hardness it ranks 221 of 254 in Canada (1 = hardest); 13 % of these cities have softer water.
- In British Columbia it is number 26 of 35 cities; the regional median is 22 mg/L.
- Nearest city with clearly softer water: Nanaimo, 92 km away (12 mg/L).
- Nearest city with clearly harder water: Campbell River, 43 km away (24 mg/L).
Ranking of the hardest and softest water in Canada →
What it means at home
- Little or no limescale in kettles, water heaters or washing machines.
- Soap lathers easily; water does not dry skin or hair.
- Dishwasher: salt setting at minimum or off.
- No softener needed; a jug filter only changes taste.
How much salt will you use for softening?
No. Water this soft does not need softening.
Descale a coffee machine or kettle about every 6 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Comox
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 1 °dH |
| AEG / Electrolux | 1 |
| Beko | 1st |
| Hoover | S0 |
| LG | H0 |
From each brand's manual for the model family named in the source; your model may differ, so check its manual. All brands and how to change the setting →
FAQ
Is Comox water hard or soft?
It is soft: 18 mg/L as CaCO₃ (1 gpg, 1 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Comox safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. Health Canada: hardness above 200 mg/L is considered poor but tolerable; above 500 mg/L unacceptable.
How many grains per gallon is Comox water?
1 gpg, equal to 1 °dH, 1.8 °fH or 18 mg/L calcium carbonate.
What dishwasher salt setting should I use in Comox?
For 18 mg/L (1 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in Comox?
No. With soft water a softener adds nothing.
Source
Source: CVRD, Annual Drinking Water Report 2025 - Comox Valley Water System (2025). Method: computed from supplier's calcium and magnesium. CVRD, Annual Drinking Water Report 2025 - Comox Valley Water System · Outdated figure? Tell us