Trois-Rivières Water Hardness & Quality Report (2026)
Water Hardness
Source
river
pH Level
7.4
neutral = 7.0
Lead
0.001 mg/L
✓ Below action level
TDS
150 mg/L
Est. Daily Cost
$0.20
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 Trois-Rivières, your appliances are currently losing 10% efficiency due to mineral buildup.
| Appliance | In Trois-Rivières | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.1 yrs | 8.5 yrs | -16% |
| Washing Machine | 10.8 yrs | 12 yrs | -10% |
| Water Heater | 12.6 yrs | 15 yrs | -16% |
Regional Water Comparison
How Trois-Rivières compares to its nearest neighbours
| City | Hardness | Mineralization | Risk |
|---|---|---|---|
| ▶ Trois-Rivières, Quebec | 75 mg/L | Medium | 🟡 Moderately Hard |
| Sainte-Catherine, Quebec | 108 mg/L | High | 🟡 Moderately Hard |
| Bécancour, Quebec | 92.5 mg/L | Medium | 🟡 Moderately Hard |
| Shawinigan, Quebec | 102 mg/L | Medium | 🟡 Moderately Hard |
| Drummondville, Quebec | 82 mg/L | Medium | 🟡 Moderately Hard |
National Benchmark
How Trois-Rivières compares to the Canada average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Trois-Rivières | 75 mg/L | 🟡 Low |
| Canada National Avg | 141 mg/L | 🟠 Moderate |
| Vancouver Top Rated | 3 mg/L | 🟢 None |
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What Makes Trois-Rivières's Water Unique?
Local geology and source profile
Trois-Rivières' drinking water is managed by Ville de Trois-Rivières, drawing from the St. Lawrence River at the city's historic confluence with the Rivière Saint-Maurice via the Trois-Rivières Water Treatment Plant. Water is treated using conventional coagulation, sedimentation, filtration, UV disinfection, and chloramination, fully meeting the Guidelines for Canadian Drinking Water Quality (GCDWQ). Hardness measures 75 mg/L (4.4 gpg) — classified as moderately hard by Health Canada, somewhat softer than Montréal's St. Lawrence supply due to the strong influence of the Saint-Maurice River.
Trois-Rivières sits at the confluence of the Rivière Saint-Maurice and the St. Lawrence. The Saint-Maurice drains the Laurentian Plateau — an extensive Precambrian Shield landscape of granite, gneiss, and anorthosite extending northward into La Tuque country — contributing very soft, low-mineral water to the St. Lawrence. This Shield tributary inflow significantly dilutes the Ordovician limestone-influenced St. Lawrence baseline at Trois-Rivières, producing the lower hardness of 75 mg/L compared to cities downstream where limestone influence is less diluted.
At 75 mg/L, Trois-Rivières residents see only moderate scale deposits in kettles and on tap aerators — descaling two to three times a year is typically sufficient. Hot water tanks in this city operate reliably at this hardness without dedicated treatment. For households in older buildings — many of which retain original pre-1970 plumbing — Ville de Trois-Rivières recommends following Health Canada precautionary guidance on lead, as the city continues its ongoing lead service line replacement programme in older residential areas.
Geology & Source: Supplied by Ville de Trois-Rivières from the St. Lawrence River at the confluence with the Rivière Saint-Maurice — blending of Shield-derived soft Maurice River water with harder Ordovician limestone-influenced St. Lawrence flow produces water at 75 mg/L (4.4 gpg).