La Haute-Yamaska County, Québec · Water Quality Report Card
Lac Waterloo
Lac Waterloo in La Haute-Yamaska, Québec received a water quality grade of D (Poor). Water clarity: 1.3 m visibility. Phosphorus: 33 µg/L. Chlorophyll-a (algae): 21.1 µg/L.
- Clarity
- 1.3 m
- Type
- Eutrophic
Lac Waterloo is a productive, nutrient-rich eutrophic lake in La Haute-Yamaska County, Québec. Water quality is graded D based on 3 sampling years through 2025. Compared to the 3 other monitored lakes in La Haute-Yamaska County, Lac Waterloo ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, MELCCFP, last sampled 2025-08-01. Grade methodology: LakeGrade methodology.
Watch Lac Waterloo water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Murky, only visible to about 4.3 ft. Phosphorus level: 33 µg/L. Chlorophyll-a: 21.1 µg/L. Trophic State Index: 57.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.3 m | D |
| Phosphorus | 33 µg/L | C |
| Chlorophyll-a (Algae) | 21.1 µg/L | D |
| Trophic State Index (TSI) | 57 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Lac Waterloo
Compare lakeside cabins, hotels, and vacation rentals near Lac Waterloo in La Haute-Yamaska, Québec — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Lac Waterloo
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip to Lac Waterloo?
Get lake water-quality report cards plus the best cabin & lodging deals near Lac Waterloo — straight to your inbox. No spam, unsubscribe anytime.
Fishing Lac Waterloo
Location
County Ranking
Ranked #3 of 4 lakes in La Haute-Yamaska
Cleaner Lakes Within 30 Miles
Lac Waterloo holds Grade D. 5 nearby lakes hold higher grades.
- ALac GaleBrome-Missisquoi · 9.7 mi · Two grade letters higher (D → A)
- ALac TrousersMemphrémagog · 10.5 mi · Two grade letters higher (D → A)
- BLac BromeBrome-Missisquoi · 5.8 mi · Two grade letters higher (D → B)
- BLac D'ArgentMemphrémagog · 10 mi · Two grade letters higher (D → B)
- BLac BromontBrome-Missisquoi · 8.8 mi · Two grade letters higher (D → B)
Nearby Lakes in La Haute-Yamaska
Explore Lac Waterloo across LakeGrade
More Québec Lake Rankings
Other Grade D Lakes in Québec
Eutrophic Lakes in Québec
More records, surveys & data sources
Where this data comes from
Measurements for Lac Waterloo come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Data Sources
Water quality data from the EPA Water Quality Portal
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion
Most recent sample: 2025-08-01
Monitoring stations: