Water filtration in Saint-Jérôme
Saint-Jérôme is the gateway to the Laurentians and the region's largest city. An in-home water test is usually scheduled within 48 business hours.
Drinking water in Saint-Jérôme
Saint-Jérôme's water comes from the Rivière du Nord. The main network, installation X0008099, serves 76,000 people; a second, much smaller network is fed by the Saint-Jérôme-des-Monts wells. The 2025 annual report, published 31 March 2026, shows no exceedance across 1,017 microbiological samples or the 15 turbidity measurements.
Two realities persist despite that compliance. Lead first: of 63 samples taken in 2025, two exceeded the 0.005 mg/L standard on 15 July — 0.0081 mg/L on rue Brière and 0.0062 mg/L on rue du Domaine. The City advised the affected residents to run the tap before drinking. Taste second: the annual trihalomethane average sits at 38.78 µg/L against an 80 standard. The City in fact devotes a section of its own website to chlorine taste and the earthy odour river water can take on.
Good news on scale, though: the City states plainly that Rivière du Nord water is not considered hard. A softener is rarely justified here. What remains to treat is taste and trace lead at the end of the line, and that is handled under the sink: activated carbon prefilters hold back chlorine, and the 0.0001-micron membrane removes up to 99% of lead per NSF/ANSI 58 testing.
Frequently asked questions — Saint-Jérôme
From the Rivière du Nord. The main network serves roughly 76,000 people; a second, much smaller one is fed by the Saint-Jérôme-des-Monts wells. Like all surface water it must be chlorinated — which the City explains itself in its section on water taste.
The 2025 annual report records two exceedances out of 63 samples, both on 15 July 2025: 0.0081 mg/L on rue Brière and 0.0062 mg/L on rue du Domaine, against a 0.005 mg/L standard. Affected residents were told to run the tap before drinking. Lead does not come from the plant but from the service connection or the building's own plumbing: only a test at your own tap tells you what flows in your home.
No. The City states itself that Rivière du Nord water is not considered hard. A softener generally has no purpose here, unlike several well-fed sectors elsewhere in the Laurentians.
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