Understanding Caledon's water
South Caledon, including Bolton, is on Peel's South Peel lake supply, the same Lake Ontario water as Brampton and Mississauga (120 to 130 mg/L). The villages run on four groundwater systems: Palgrave–Caledon East, Caledon Village–Alton, Inglewood and Cheltenham. In 2025, Palgrave measured 240 to 250 mg/L hardness and Caledon East 280 to 360 mg/L. Peel removes iron and manganese with greensand filters at several of these wells, and doesn't add fluoride.
| Supply | Hardness (mg/L) | Grains / gallon |
|---|---|---|
| Bolton / south Caledon (South Peel, lake) | 120–130 | 7.0–7.6 |
| Palgrave | 240–250 | 14.0–14.6 |
| Caledon East | 280–360 | 16.4–21.1 |
Why Caledon homes treat their water
Caledon has some of the hardest municipal water in the GTA, and most of the town outside Bolton and the villages is on private wells. Softeners here work hard, so sizing matters.
Recommended water treatment for Caledon homes
We recommend systems based on where your water comes from. Your free in-home test confirms the fit before anything is installed.
Caledon homes on municipal water
Bolton, Caledon East, Palgrave, Caledon Village, Alton, Inglewood, Cheltenham, Terra Cotta, Mono Mills
Softening first: at these hardness levels it protects every appliance. The Enhanced Water Softener also removes chlorine, and reverse osmosis gives bottled-quality drinking water.
Homes on private wells
Belfountain, Claude, Castlederg, Sandhill and rural Caledon
Private wells usually need iron and manganese removal, softening and UV disinfection, plus tannin treatment if the water is tea-coloured.
Iron & Manganese Filter
Birm media removes iron, manganese and the orange or black stains they leave.
See Iron & Manganese Filter
SoftBlu Water Softener
High-capacity softener that stops scale on fixtures, kettles and appliances.
See SoftBlu Water Softener
UV Pro
Ultraviolet disinfection for well water: bacteria, viruses and cysts.
See UV Pro
Tannin Eliminator
Clears tea-coloured water and yellow stains caused by tannins.
See Tannin EliminatorPopular in Caledon
Nearby areas we also serve
Questions
How hard is Caledon water?
South Caledon, including Bolton, is on Peel's South Peel lake supply, the same Lake Ontario water as Brampton and Mississauga (120 to 130 mg/L). See the table above for each supply.
Is there free well water testing near Caledon?
Yes. Public Health Ontario tests private well water for bacteria for free; sample bottles are available through your regional health unit. Our free in-home test covers iron, hardness and other minerals.
Free in-home water test
Find out what's in your Caledon water
We test your water at your home, show you what's in it, and recommend the system that fits.
- Free
- About 30 minutes
- No obligation