Saint-Jérôme Water Hardness & Quality Report (2026)
Water Hardness
Source
river
pH Level
7.4
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
130.1 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 Saint-Jérôme, your appliances are currently losing 10% efficiency due to mineral buildup.
| Appliance | In Saint-Jérôme | 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 Saint-Jérôme compares to its nearest neighbours
| City | Hardness | Mineralization | Risk |
|---|---|---|---|
| ▶ Saint-Jérôme, Quebec | 73 mg/L | Medium | 🟡 Moderately Hard |
| Saint-Canut, Quebec | 115.5 mg/L | High | 🟡 Moderately Hard |
| Prévost, Quebec | 83.5 mg/L | Medium | 🟡 Moderately Hard |
| Mirabel, Quebec | 102.5 mg/L | Medium | 🟡 Moderately Hard |
| Blainville, Quebec | 70.5 mg/L | Medium | 🟡 Moderately Hard |
National Benchmark
How Saint-Jérôme compares to the Canada average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Saint-Jérôme | 73 mg/L | 🟡 Low |
| Canada National Avg | 141 mg/L | 🟠 Moderate |
| Vancouver Top Rated | 3 mg/L | 🟢 None |
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What Makes Saint-Jérôme's Water Unique?
Local geology and source profile
Saint-Jérôme's drinking water is managed by Ville de Saint-Jérôme, the regional capital of the Laurentides, drawing from the Rivière du Nord via the municipal water treatment plant. Water undergoes coagulation, sedimentation, filtration, UV disinfection, and chloramination, fully meeting the Guidelines for Canadian Drinking Water Quality (GCDWQ). Hardness measures 73 mg/L (4.3 gpg) — classified as moderately hard by Health Canada, reflecting the Rivière du Nord's journey from the Precambrian Shield highlands of the lower Laurentians through the transition zone into the Montréal Lowlands.
The Rivière du Nord flows southward from the southern Laurentian Shield into the St. Lawrence Lowlands before discharging into Lac des Deux Montagnes. Its watershed spans a geological boundary — draining resistant Precambrian granite and gneiss in the upper reaches (contributing very soft water from Shield sub-catchments) and transitioning into Ordovician limestone and dolostone of the Montréal Lowlands in its lower corridor near Saint-Jérôme. The 73 mg/L measured at the tap reflects this mixed geology, with the Lowlands carbonate component moderating the otherwise very soft Shield character.
At 73 mg/L, Saint-Jérôme residents experience moderate scale deposits in kettles and on tap aerators — descaling every two to three months is typically adequate. Hot water tanks operate reliably at this hardness level without dedicated treatment. Ville de Saint-Jérôme provides annual water quality reports following Ministère de l'Environnement provincial standards, and residents in pre-1970 housing are advised to follow Health Canada lead precautionary guidance given the city's heritage residential stock along the Rivière du Nord corridor.
Geology & Source: Supplied by Ville de Saint-Jérôme from the Rivière du Nord — water draining the southern Laurentian Shield highlands and transitioning to the St. Lawrence Lowlands at the Laurentides–Montréal boundary produces moderately hard water at 73 mg/L (4.3 gpg).