Chatham Water Hardness & Quality Report (2026)
Water Hardness
Source
lake
pH Level
8.4
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
767.6 mg/L
Est. Daily Cost
$0.79
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 Chatham, your appliances are currently losing 40% efficiency due to mineral buildup.
| Appliance | In Chatham | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.5 yrs | 8.5 yrs | -82% |
| Washing Machine | 3 yrs | 12 yrs | -75% |
| Water Heater | 5 yrs | 15 yrs | -67% |
Regional Water Comparison
How Chatham compares to its nearest neighbours
| City | Hardness | Mineralization | Risk |
|---|---|---|---|
| ▶ Chatham, Ontario | 297.5 mg/L | Very High | 🔴 Very Hard |
| Leamington, Ontario | 265 mg/L | Very High | 🔴 Very Hard |
| Sarnia, Ontario | 215.5 mg/L | Very High | 🔴 Very Hard |
| Kingsville, Ontario | 301 mg/L | Very High | 🔴 Very Hard |
| Tecumseh, Ontario | 271.5 mg/L | Very High | 🔴 Very Hard |
National Benchmark
How Chatham compares to the Canada average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Chatham | 297.5 mg/L | 🔴 High |
| Canada National Avg | 141 mg/L | 🟠 Moderate |
| Vancouver Top Rated | 3 mg/L | 🟢 None |
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What Makes Chatham's Water Unique?
Local geology and source profile
Chatham's drinking water is managed by Chatham-Kent, drawing from Lake Erie (via the Thames River–Lake Erie corridor) through the Chatham Water Treatment Plant. Water undergoes coagulation, sedimentation, filtration, UV disinfection, and chloramination, fully meeting the Guidelines for Canadian Drinking Water Quality (GCDWQ). Hardness measures 297.5 mg/L (17.4 gpg) — classified as very hard by Health Canada, with a TDS of 768 mg/L and elevated pH of 8.4 reflecting the extreme carbonate and sulphate mineral loading of the Lake Erie source combined with the highly soluble Silurian and Devonian carbonate, dolostone, and evaporite geology of the Chatham-Kent plain.
Chatham-Kent lies in the flat Lake Erie Lowland of southwestern Ontario — a geological province underlain by Silurian Salina Formation gypsum and anhydrite evaporites and Devonian Detroit River, Lucas, and Dundee Formation limestone and dolostone. The Lake Erie water source itself is the hardest of the Great Lakes, reflecting the Michigan Basin and Appalachian Plateau carbonate watershed; by the time this lake water reaches Chatham's treatment plant, the combination of the lake's hard baseline (198+ mg/L range) and the additional mineral contribution from the local Silurian evaporite geology produces the exceptionally high 297.5 mg/L and TDS of 768 mg/L.
At 297.5 mg/L, Chatham homeowners face extremely rapid scale accumulation on kettle elements, showerheads, and in hot water tanks — weekly descaling is often necessary. Hot water tank elements may fail within months without treatment. A whole-home ion-exchange water softener is a near-essential appliance in Chatham at this extreme hardness level, and installation is standard practice among most long-term homeowners. Chatham-Kent provides water quality reports at chatham-kent.ca.
Geology & Source: Supplied by Chatham-Kent from Lake Erie via the Chatham Water Treatment Plant — Lake Erie's very hard water combined with the Silurian and Devonian carbonate and evaporite geology of the southwestern Ontario plain produces extremely hard water at 297.5 mg/L (17.4 gpg).