La Haute-Yamaska County, Québec · Water Quality Report Card
Lac Roxton
Lac Roxton in La Haute-Yamaska, Québec received a water quality grade of D (Poor). Water clarity: 1.2 m visibility. Phosphorus: 56.7 µg/L. Chlorophyll-a (algae): 36.4 µg/L.
- Clarity
- 1.2 m
- Type
- Eutrophic
Lac Roxton 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 Roxton ranks #4 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
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Murky, only visible to about 3.8 ft. Phosphorus level: 56.7 µg/L. Chlorophyll-a: 36.4 µg/L. Trophic State Index: 62.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.15 m | D |
| Phosphorus | 56.7 µg/L | C |
| Chlorophyll-a (Algae) | 36.4 µg/L | F |
| Trophic State Index (TSI) | 62 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Lac Roxton
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Fishing Lac Roxton
Location
County Ranking
Ranked #4 of 4 lakes in La Haute-Yamaska
Cleaner Lakes Within 30 Miles
Lac Roxton holds Grade D. 5 nearby lakes hold higher grades.
- ALac GaleBrome-Missisquoi · 13.9 mi · Two grade letters higher (D → A)
- BLac BromeBrome-Missisquoi · 16.6 mi · Two grade letters higher (D → B)
- BLac BromontBrome-Missisquoi · 13.9 mi · Two grade letters higher (D → B)
- BLac DavignonBrome-Missisquoi · 18.3 mi · Two grade letters higher (D → B)
- CRéServoir ChoinièReLa Haute-Yamaska · 3.8 mi · Higher grade (D → C)
Nearby Lakes in La Haute-Yamaska
Explore Lac Roxton 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 Roxton 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: