Water filtration in Sainte-Agathe-des-Monts
Sainte-Agathe-des-Monts draws its water from a lake within its own territory, which makes the question of taste — and of protecting the source — very concrete for residents.
Drinking water in Sainte-Agathe-des-Monts
The City draws its water from Lac Grignon, which everyone calls the « petit lac des Sables ». In summer, when the level drops, a pumping station lifts water from the larger Lac des Sables into the smaller one. The distribution system, number X0008109, serves 13,675 people.
The 2025 annual report, published 29 January 2026, is clean: no standard exceeded anywhere. 168 total coliform samples and 168 for E. coli, 20 lead samples, 20 for copper, 12 for turbidity, 4 for pesticides — all compliant, and trihalomethanes as well. The City has published its annual reports online since 2018.
What remains is what a compliant report does not measure: taste. Lake water must be disinfected before entering the network, and that disinfection leaves a signature many residents notice. Reverse osmosis comes after all of it, under the sink: activated carbon prefilters hold back chlorine and its taste, and the 0.0001-micron membrane removes up to 99% of lead per NSF/ANSI 58 testing — useful in older buildings, where lead comes from the service connection or the plumbing, never from the plant.
Frequently asked questions — Sainte-Agathe-des-Monts
From Lac Grignon, commonly called the « petit lac des Sables ». The City also operates a pumping station that lifts water from the larger Lac des Sables into the smaller one in summer, when the level is lower. The network serves 13,675 people.
Not in 2025. The annual report published 29 January 2026 records no standard exceeded, including across the 20 lead samples and the 336 microbiological analyses. The City has posted its annual reports online since 2018, which makes year-to-year comparison possible.
Hardness is not a regulated parameter in Quebec and the City does not publish it — we will not invent it. That is exactly what the free water test measures at your home, along with dissolved solids, pH, chlorine and pressure, before we recommend anything at all.
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