Bolton Water Hardness & Quality Report (2026)
Water Hardness
Source
lake
pH Level
8.3
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
686.9 mg/L
Est. Daily Cost
$0.68
energy & soap waste
Source: Health Canada Water Quality · Updated 2026
0–60
mg/L
Soft
61–120
mg/L
Moderately Hard
121–180
mg/L
Hard
180+
mg/L
Very Hard
Appliance Damage Report
In Bolton, your appliances are currently losing 34% efficiency due to mineral buildup.
| Appliance | In Bolton | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.5 yrs | 8.5 yrs | -82% |
| Washing Machine | 4.1 yrs | 12 yrs | -66% |
| Water Heater | 5.4 yrs | 15 yrs | -64% |
Regional Water Comparison
How Bolton compares to its nearest neighbours
| City | Hardness | Mineralization | Risk |
|---|---|---|---|
| ▶ Bolton, Ontario | 256 mg/L | Very High | 🔴 Very Hard |
| Brampton, Ontario | 130 mg/L | High | 🟠 Hard |
| Mount Olive-Silverstone-Jamestown, Ontario | 235 mg/L | Very High | 🔴 Very Hard |
| Humber Summit, Ontario | 173 mg/L | High | 🟠 Hard |
| West Humber-Clairville, Ontario | 235 mg/L | Very High | 🔴 Very Hard |
National Benchmark
How Bolton compares to the Canada average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Bolton | 256 mg/L | 🔴 High |
| Canada National Avg | 141 mg/L | 🟠 Moderate |
| Vancouver Top Rated | 3 mg/L | 🟢 None |
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What Makes Bolton's Water Unique?
Local geology and source profile
Bolton's drinking water is managed by the Town of Caledon (part of Peel Region), drawing from Lake Ontario transmission supply via the Peel Region water system, blended with local groundwater from Niagara Escarpment dolostone wellfields serving this Humber River Valley community. Treatment includes coagulation, sedimentation, filtration, UV disinfection, and chloramination, meeting all Guidelines for Canadian Drinking Water Quality (GCDWQ) requirements. Hardness measures 256 mg/L (14.9 gpg) — classified as very hard by Health Canada, with TDS of 687 mg/L, elevated above Brampton (228.5 mg/L from batch 4) due to the significant Escarpment dolostone groundwater component in Bolton's supply blend.
Bolton is situated in the Humber River Valley at the southern base of the Niagara Escarpment — the prominent Silurian Lockport Formation dolostone ridge. Well sources in the Bolton area tap the Silurian dolostone aquifer, yielding highly calcareous water that blends with Lake Ontario transmission supply in the distribution system. The elevated TDS of 687 mg/L reflects the combined carbonate hardness from both Lake Ontario and the dolostone aquifer — resulting in a supply that is measurably harder than the unblended Peel Region Lake Ontario supply of southern Brampton.
At 256 mg/L, Bolton homeowners face persistent scale challenges — kettle elements and showerheads require monthly cleaning. Hot water tank elements accumulate significant scale; annual inspection and flushing are recommended. A whole-home water softener is a practical investment at this very hard Escarpment-influenced supply level. The Town of Caledon provides water quality information at caledon.ca; Bolton's growing residential community benefits from Peel Region's water quality reporting infrastructure and Health Canada compliance programmes.
Geology & Source: Supplied by Town of Caledon (Peel Region) from Lake Ontario transmission supply blended with Niagara Escarpment dolostone groundwater — the Bolton distribution zone on the Escarpment foothills produces very hard water at 256 mg/L (14.9 gpg).