Bellechasse County, Québec · Water Quality Report Card
Lac Therrien
Lac Therrien in Bellechasse, Québec received a water quality grade of A (Excellent). Phosphorus: 10.6 µg/L. Chlorophyll-a (algae): 6.2 µg/L.
- Type
- Mesotrophic
Lac Therrien is a mesotrophic lake in Bellechasse County, Québec. Water quality is graded A based on 2 sampling years through 2021. Compared to the 8 other monitored lakes in Bellechasse County, Lac Therrien ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, MELCCFP, last sampled 2021-08-01. Grade methodology: LakeGrade methodology.
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Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
No clarity data. Phosphorus level: 10.6 µg/L. Chlorophyll-a: 6.2 µg/L. Trophic State Index: 43.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 10.6 µg/L | A |
| Chlorophyll-a (Algae) | 6.2 µg/L | B |
| Trophic State Index (TSI) | 43 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Lac Therrien
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Fishing Lac Therrien
Location
County Ranking
Ranked #2 of 9 lakes in Bellechasse
Nearby Lakes in Bellechasse
Explore Lac Therrien across LakeGrade
More Québec Lake Rankings
Other Grade A Lakes in Québec
Mesotrophic Lakes in Québec
More records, surveys & data sources
Where this data comes from
Measurements for Lac Therrien 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: 2021-08-01
Monitoring stations: