Water hardness in Whitchurch-Stouffville
318 mg/L very hard
Tap water in Whitchurch-Stouffville is very hard: 318 mg/L (18.6 gpg · 17.8 °dH · 31.8 °fH).
Source: York Region, Drinking Water Quality and Monitoring (2026 Q2 average hardness) (2026-06) · data checked 2026-11-02
York Region's 2026 Q2 average hardness table gives 318 mg/L as CaCO3 for Stouffville, and that figure is used here for the municipality. It is a regional table figure, not a reading from a single tap, and it is hard. Expect scale on kettles and water heaters, and check the York Region page for your own area.
Health Canada: hardness above 200 mg/L is considered poor but tolerable; above 500 mg/L unacceptable.
Water data
| Total hardness | 318 mg/L |
|---|---|
| Utility | York Region |
How Whitchurch-Stouffville compares
- Tap water in Whitchurch-Stouffville is 214 % harder than the median of the 254 cities we track in Canada (101 mg/L).
- By hardness it ranks 18 of 254 in Canada (1 = hardest); 93 % of these cities have softer water.
- In Ontario it is number 17 of 120 cities; the regional median is 124 mg/L.
- Nearest city with clearly softer water: Ballantrae, 4 km away (205 mg/L).
- Nearest city with clearly harder water: Fergus, 91 km away (519 mg/L).
Ranking of the hardest and softest water in Canada →
What it means at home
- Severe scale: heater elements and washing-machine heaters fail early.
- Detergent use is very high; taps and screens coat within days.
- Dishwasher at maximum salt setting.
- An ion-exchange softener is practically essential; RO for drinking water.
How much salt will you use for softening?
Yes. At this hardness a softener pays for itself through appliance life and detergent.
Descale a coffee machine or kettle about every 1 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Whitchurch-Stouffville
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 18 °dH |
| AEG / Electrolux | 4 |
| Beko | 5th |
| Hoover | S3 |
| LG | H3 |
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 Whitchurch-Stouffville water hard or soft?
It is very hard: 318 mg/L as CaCO₃ (18.6 gpg, 17.8 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Whitchurch-Stouffville 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 Whitchurch-Stouffville water?
18.6 gpg, equal to 17.8 °dH, 31.8 °fH or 318 mg/L calcium carbonate.
What dishwasher salt setting should I use in Whitchurch-Stouffville?
For 318 mg/L (17.8 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Whitchurch-Stouffville?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: York Region, Drinking Water Quality and Monitoring (2026 Q2 average hardness) (2026-06). Method: figure published by the water supplier. York Region, Drinking Water Quality and Monitoring (2026 Q2 average hardness) · Outdated figure? Tell us