Is Lac de la Montagne safe to swim in?

Good for swimming, clear water with low algae levels. Lac de la Montagne has an overall water quality grade of B. Algae concentration (chlorophyll-a) is 6.1 µg/L. Always check local health department advisories before swimming.

Argenteuil County, Québec · Water Quality Report Card

Lac de la Montagne

Grade B — Good

Mesotrophic

Lac de la Montagne in Argenteuil, Québec received a water quality grade of B (Good). Water clarity: 2.2 m visibility. Phosphorus: 14.6 µg/L. Chlorophyll-a (algae): 6.1 µg/L.

Clarity: 2.2 m
Type: Mesotrophic

Where to stay →Safe to swim?

Lac de la Montagne is a mesotrophic lake in Argenteuil County, Québec. Water quality is graded B based on 3 sampling years through 2025. Compared to the 47 other monitored lakes in Argenteuil County, Lac de la Montagne ranks #40 for water quality.

Source: EPA Water Quality Portal sampling records, MELCCFP, last sampled 2025-08-01. Grade methodology: LakeGrade methodology.

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Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

Moderate clarity, visible to about 7.2 ft. Phosphorus level: 14.6 µg/L. Chlorophyll-a: 6.1 µg/L. Trophic State Index: 47.

Metric	Value	Grade
Water Clarity (Secchi Depth)	2.2 m	C
Phosphorus	14.6 µg/L	A
Chlorophyll-a (Algae)	6.1 µg/L	B
Trophic State Index (TSI)	47	Mesotrophic

Moderate nutrients, good water quality

Where to stay near Lac de la Montagne

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