Thetford-Mines Water Hardness & Quality Report (2026)
Water Hardness
Source
river
pH Level
7.4
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
136.3 mg/L
Est. Daily Cost
$0.19
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 Thetford-Mines, your appliances are currently losing 10% efficiency due to mineral buildup.
| Appliance | In Thetford-Mines | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.2 yrs | 8.5 yrs | -15% |
| Washing Machine | 10.9 yrs | 12 yrs | -9% |
| Water Heater | 12.7 yrs | 15 yrs | -15% |
Regional Water Comparison
How Thetford-Mines compares to its nearest neighbours
| City | Hardness | Mineralization | Risk |
|---|---|---|---|
| ▶ Thetford-Mines, Quebec | 73 mg/L | Medium | 🟡 Moderately Hard |
| Sainte-Marie, Quebec | 55 mg/L | Low | 🟢 Soft |
| Saint-Georges, Quebec | 64 mg/L | Medium | 🟡 Moderately Hard |
| Victoriaville, Quebec | 55 mg/L | Low | 🟢 Soft |
| Saint-Augustin-de-Desmaures, Quebec | 83.5 mg/L | Medium | 🟡 Moderately Hard |
National Benchmark
How Thetford-Mines compares to the Canada average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Thetford-Mines | 73 mg/L | 🟡 Low |
| Canada National Avg | 141 mg/L | 🟠 Moderate |
| Vancouver Top Rated | 3 mg/L | 🟢 None |
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What Makes Thetford-Mines's Water Unique?
Local geology and source profile
Thetford-Mines' drinking water is managed by Ville de Thetford-Mines, a historic mining town in the Chaudière-Appalaches region of Quebec, known as the former world capital of chrysotile asbestos production, drawing from local watershed rivers and reservoir supply sourced from the Appalachian Highlands terrain surrounding the city. Water undergoes coagulation, sedimentation, filtration, UV disinfection, and chloramination, meeting all Guidelines for Canadian Drinking Water Quality (GCDWQ) requirements. Hardness measures 73 mg/L (4.3 gpg) — classified as moderately hard by Health Canada, consistent with the Appalachian river systems of southern Quebec.
The watershed supplying Thetford-Mines drains the Appalachian Highlands of the Chaudière-Appalaches region — ancient Cambrian and Ordovician metasedimentary rocks including quartzite, schist, and phyllite that are moderately soluble. The region's unique ophiolite complexes (fragments of ancient oceanic crust) around the Thetford asbestos belt contribute ultramafic rock types (dunite, serpentinite) that release some magnesium and calcium. The net result is a moderately hard 73 mg/L supply — harder than the Quebec City corridor (79–82 mg/L from the St. Lawrence) but reflecting a distinct Appalachian watershed character.
At 73 mg/L, Thetford-Mines residents experience minimal scale accumulation — occasional kettle cleaning every two to three months is sufficient. Hot water tanks have an excellent operational lifespan. Ville de Thetford-Mines publishes annual water quality reports following Ministère de l'Environnement standards. Health Canada lead precautionary guidance applies to residents in the city's older pre-1975 mining-era housing stock.
Geology & Source: Supplied by Ville de Thetford-Mines from local watershed rivers and reservoirs in the Chaudière-Appalaches region — Appalachian terrain river supply produces moderately hard water at 73 mg/L (4.3 gpg).