Popular searches
Quick links
Granby's tap water comes mostly from the Rivière Yamaska Nord, fed by the Choinière reservoir, and about 7% comes from Lac sur la Montagne on Mont Shefford. It is treated at the City's Centrale de traitement d'eau. The City gives a hardness range of 35 to 100 mg/L for its distributed water. That runs from soft water to moderately hard water, so scale can build up at the top of the range. The City publishes this range without a date or a number of samples, so treat it as a general guide.
Data last reviewed October 24, 2026.
Granby ranks #12 softest of 31 cities in the Canadian Hard Water Report 2026. See the full ranking
In other units
Source: Ville de Granby, FAQ: physical and chemical parameters of distributed water (in French). Data for: Range published by the City, no date given. Checked October 24, 2026.
Some scale builds up over time, mostly where water gets heated: kettles, coffee makers and washers. A monthly clean keeps it in check.
At this hardness, grease and detergent residue are the bigger issue, so start with the dishwasher.
Only dishwashers with a built-in water softener have a hardness setting. Here is the setting for this water, worked out from each maker's own table.
| Brand | Setting |
|---|---|
| Bosch and ThermadorCanadian models with a softener. H:00 is off. | H:00 |
| GaggenauSame ranges as Bosch. The display shows the °E band. | 0-8 |
| MieleSet in °dH. Below 5, Miele says no salt is needed. | 2 to 6 |
| Fisher & PaykelDishDrawer models with a softener. 0 is off. | 0 |
When hardness varies, Miele says to set the higher value.
Most North American dishwashers, including Bosch models sold in the United States, have no water softener and no hardness setting. With those, use rinse aid and run a dishwasher cleaner once a month.
Sources: Bosch SHX78CC5UC manual, Thermador DWHD661EFP manual, Gaggenau DF481701 manual, Miele dishwasher manual (Canada), Fisher & Paykel DishDrawer guide
Softeners take hardness in US grains per gallon: the figure in mg/L divided by 17.12, rounded up.
| Brand | Setting |
|---|---|
| Nespresso Essenza PlusHardness level, and cups between descalings | Level 0 (4,000 cups) to Level 1 (3,000 cups) |
| Jura E8Hardness setting | 2 °dH to 6 °dH |
Sources: Nespresso Essenza Plus manual, Jura E8 manual, Breville Barista Touch manual, De'Longhi descaling FAQ, Keurig descaling page
Hard water leaves scale on the heating element and the drum, and more detergent residue behind.
Dissolves grease, detergent residue and limescale buildup, and removes odour-causing buildup.
Clears grease, limescale and odour buildup
Breaks down residue and odour-causing buildup inside your washer.
Removes odour and buildup from the drum and hoses
Removes limescale, mineral buildup and coffee oils inside your coffee maker.
Descales for better-tasting coffee
We use the U.S. Geological Survey scale, in mg/L as CaCO₃.
Utilities usually report hardness in mg/L as calcium carbonate (CaCO₃), which is the same as ppm. Dishwasher and softener manuals often use grains per gallon or German degrees instead. Here is how they convert:
No, it is soft to moderately hard. The City of Granby gives a range of 35 to 100 mg/L for its distributed water. Water counts as hard above 120 mg/L, so even the top of the range stays below that line.
Mostly from the Rivière Yamaska Nord, fed by the Choinière reservoir in Parc de la Yamaska, with the intake in the Lemieux reservoir. About 7% of the flow comes from Lac sur la Montagne on Mont Shefford. The water is treated at the City's Centrale de traitement d'eau.
Now and then. Near the top of Granby's range, scale builds up slowly in kettles and coffee makers. Descaling the coffee maker every few weeks and cleaning the dishwasher and the washer about every two weeks keeps buildup and odours in check.
For dishwashers with a built-in water softener, each maker's table gives: Centrale de traitement d'eau (water treatment plant): Bosch and Thermador H:00, Gaggenau 0-8, Miele 2 to 6, Fisher & Paykel 0. Most North American dishwashers, including Bosch models sold in the United States, have no water softener and no hardness setting. With those, use rinse aid and run a dishwasher cleaner once a month.
Centrale de traitement d'eau (water treatment plant): 3 to 6 grains per US gallon (rounded up).
Centrale de traitement d'eau (water treatment plant): 2.0 to 5.8 grains per US gallon, or 2.5 to 7.0 grains per imperial gallon.
Ville de Granby, FAQ: physical and chemical parameters of distributed water (in French). Data for Range published by the City, no date given. We update this page when a new report comes out.
Writing about water in Granby? Copy this code into your site's HTML. The badge links back to this page and its sources.
Your cart is empty.
Shop cleaners
