Water hardness in North Perth
265 mg/L very hard
Tap water in North Perth is very hard: 265 mg/L (15.5 gpg · 14.8 °dH · 26.5 °fH).
Source: Municipality of North Perth, 2023 Listowel Annual Drinking Water Report (2023) · data checked 2026-11-03
North Perth's 2023 Listowel annual drinking water report gives one system-wide hardness of approximately 265 mg/L (15 grains per gallon). It covers the Listowel, Atwood, Gowanstown and Molesworth systems, so it is not a per-town reading. The 2025 report prints no hardness, so 2023 is the latest figure we could verify. At this level, expect heavy scale on kettles and water heaters.
Health Canada: hardness above 200 mg/L is considered poor but tolerable; above 500 mg/L unacceptable.
Water data
| Total hardness | 265 mg/L |
|---|---|
| Utility | Municipality of North Perth (Listowel, Atwood, Gowanstown, Molesworth systems) |
How North Perth compares
- Tap water in North Perth is 162 % harder than the median of the 254 cities we track in Canada (101 mg/L).
- By hardness it ranks 27 of 254 in Canada (1 = hardest); 89 % of these cities have softer water.
- In Ontario it is number 25 of 120 cities; the regional median is 124 mg/L.
- Nearest city with clearly softer water: Goderich, 60 km away (102 mg/L).
- Nearest city with clearly harder water: Stratford, 40 km away (489 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 North Perth
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 15 °dH |
| AEG / Electrolux | 4 |
| Beko | 4th |
| Hoover | S2 |
| 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 North Perth water hard or soft?
It is very hard: 265 mg/L as CaCO₃ (15.5 gpg, 14.8 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in North Perth 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 North Perth water?
15.5 gpg, equal to 14.8 °dH, 26.5 °fH or 265 mg/L calcium carbonate.
What dishwasher salt setting should I use in North Perth?
For 265 mg/L (14.8 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in North Perth?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Municipality of North Perth, 2023 Listowel Annual Drinking Water Report (2023). Method: figure published by the water supplier. Municipality of North Perth, 2023 Listowel Annual Drinking Water Report · Outdated figure? Tell us