Water hardness in Windsor
Windsor, Ontario tap water is moderately hard, drawn from detroit river / lake st. clair surface water via windsor water treatment. Here is what it means at home, and the source.
What this means at home
Some kettle and showerhead scale over time, but most homes get by without a softener.
Windsor water is distributed by ENWIN; hardness ranges from the mid-90s to 125 mg/L as CaCO3.
You likely do not need a softener. Because the number moves around the city, test your own tap before you buy or set one.
New to this? Read hard water, explained, including whether it is safe to drink and how to test your tap.
The number, in real terms
At 95-125 mg/L mg/L (5.6 to 7.3 grains per gallon), a four-person Windsor household puts only about 1,930 grains of hardness a day through its plumbing (industry sizing convention: about 300 US gallons a day). That is a light enough load that most homes skip the softener and just descale the kettle now and then.
Scale ceiling: every 1,000 litres heated can leave at most 110 grams of scale, because that is the total mineral carried at 95-125 mg/L mg/L. Real kettles and water heaters precipitate a fraction of that, but the ceiling scales with the number: Windsor's moderately hard water leaves little behind.
How this is calculated: grains per gallon = mg/L divided by 17.1; daily grain load = gpg x 300 US gallons (the softener trade sizes in US gallons, four-person household); regeneration interval = 32,000 grains divided by the daily load; scale ceiling = mg/L carried per 1,000 L. The input figure is ENWIN Utilities Ltd.'s own published number, checked 2026-07-03. Full method on the methodology page.
Windsor water hardness questions
How hard is the water in Windsor?
Windsor's tap water is moderately hard, about 95-125 mg/L mg/L as calcium carbonate (5.6 to 7.3 grains per gallon), drawn from detroit river / lake st. clair surface water via windsor water treatment. Figure from ENWIN Utilities Ltd., last checked 2026-07-03.
Do I need a water softener in Windsor?
Probably not. Windsor water is moderately hard, so most homes get by without one. A simple test kit settles it if you are unsure.
How does Windsor compare with nearby towns?
Closest verified figures: Tecumseh at mid 90's to 125 mg/L, Bluewater at 107 mg/L, LaSalle at 90 to 125 mg/L as CaCO3 mg/L. Windsor sits at 95-125 mg/L mg/L, all measured as calcium carbonate.
Source
Source: ENWIN Utilities Ltd., last checked 2026-07-03. Hardness varies by neighbourhood, season, and which well or plant serves your street, especially on groundwater systems. These are the municipal published figures as of the verified date, good for planning, not a substitute for a home test or your utility's current report.
Compare nearby verified figures: Tecumseh (mid 90's to 125 mg/L), Bluewater (107 mg/L), LaSalle (90 to 125 mg/L as CaCO3 mg/L). Or see every municipality.