Caledon Water Hardness & Quality Report (2026)
Water Hardness
Source
lake
pH Level
8.4
neutral = 7.0
Lead
0.006 mg/L
✓ Below action level
TDS
769 mg/L
Est. Daily Cost
$0.73
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 Caledon, your appliances are currently losing 37% efficiency due to mineral buildup.
| Appliance | In Caledon | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.5 yrs | 8.5 yrs | -82% |
| Washing Machine | 3.4 yrs | 12 yrs | -72% |
| Water Heater | 5 yrs | 15 yrs | -67% |
Regional Water Comparison
How Caledon compares to its nearest neighbours
| City | Hardness | Mineralization | Risk |
|---|---|---|---|
| ▶ Caledon, Ontario | 275 mg/L | Very High | 🔴 Very Hard |
| Erin, Ontario | 264 mg/L | Very High | 🔴 Very Hard |
| Orangeville, Ontario | 150.5 mg/L | High | 🟠 Hard |
| Georgetown, Ontario | 187 mg/L | High | 🔴 Very Hard |
| Halton Hills, Ontario | 260.5 mg/L | Very High | 🔴 Very Hard |
National Benchmark
How Caledon compares to the Canada average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Caledon | 275 mg/L | 🔴 High |
| Canada National Avg | 141 mg/L | 🟠 Moderate |
| Vancouver Top Rated | 3 mg/L | 🟢 None |
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What Makes Caledon's Water Unique?
Local geology and source profile
Caledon's drinking water is managed by the Region of Peel, primarily supplied via Lake Ontario transmission mains but with a significant proportion of local groundwater from Silurian Niagara Escarpment dolostone wellfields in this escarpment-crest community. Treatment includes coagulation, sedimentation, lime softening, filtration, UV disinfection, and chloramination, meeting all Guidelines for Canadian Drinking Water Quality (GCDWQ) standards. Despite lime softening, hardness at the tap remains very high at 275 mg/L (16.1 gpg) — classified as very hard by Health Canada, with TDS of 769 mg/L reflecting the heavy carbonate and sulphate load from the Escarpment dolostone aquifer.
Caledon occupies the crest and slopes of the Niagara Escarpment — a prominent ridge of Silurian Lockport Formation dolostone that dissolves readily on contact with groundwater. Local wells tapping the dolostone aquifer produce extremely hard water comparable to Guelph (330 mg/L) and Cambridge (280 mg/L) in the same carbonate belt. When this is blended with moderately hard Lake Ontario transmission supply in Caledon's rural distribution zone, the combined hardness is very high, and the presence of Salina Formation gypsum beneath the escarpment adds a significant sulphate component to the elevated TDS.
At 275 mg/L, Caledon homes face some of the hardest water in the Region of Peel. Kettle elements require weekly descaling, and hot water tank heating elements accumulate heavy scale within months. A whole-home ion-exchange water softener is strongly recommended for Caledon households — it is widely regarded as a near-necessity in this Niagara Escarpment community. The Region of Peel provides information on water quality and treatment at peelregion.ca and advises residents on certified water softener and treatment options.
Geology & Source: Supplied by Region of Peel from Lake Ontario transmission with significant Silurian Niagara Escarpment dolostone groundwater blending in the Caledon distribution zone — carbonate aquifer dissolution on the Escarpment crest produces very hard, high-TDS water at 275 mg/L (16.1 gpg).