L'Érable County, Québec · Water Quality Report Card
Lac Joseph
Lac Joseph in L'Érable, Québec received a water quality grade of C (Fair). Water clarity: 1.5 m visibility. Phosphorus: 20.7 µg/L. Chlorophyll-a (algae): 7.2 µg/L.
- Clarity
- 1.5 m
- Type
- Eutrophic
Lac Joseph is a productive, nutrient-rich eutrophic lake in L'Érable County, Québec. Water quality is graded C based on 3 sampling years through 2025. Compared to the 1 other monitored lakes in L'Érable County, Lac Joseph ranks #1 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
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Murky, only visible to about 4.9 ft. Phosphorus level: 20.7 µg/L. Chlorophyll-a: 7.2 µg/L. Trophic State Index: 51.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.5 m | D |
| Phosphorus | 20.7 µg/L | B |
| Chlorophyll-a (Algae) | 7.2 µg/L | B |
| Trophic State Index (TSI) | 51 | Eutrophic |
High nutrients, frequent algae, reduced clarity
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Fishing Lac Joseph
Location
County Ranking
Ranked #1 of 2 lakes in L'Érable
Cleaner Lakes Within 30 Miles
Lac Joseph holds Grade C. 4 nearby lakes hold higher grades.
- BLac de L'EstLes Appalaches · 19.2 mi · Higher grade (C → B)
- BPetit Lac Saint-FrançOisLes Appalaches · 19.8 mi · Higher grade (C → B)
- BLac CaribouLes Appalaches · 16.8 mi · Higher grade (C → B)
- BLac du HuitLes Appalaches · 18 mi · Higher grade (C → B)
Nearby Lakes in L'Érable
Explore Lac Joseph across LakeGrade
More Québec Lake Rankings
Other Grade C Lakes in Québec
Eutrophic Lakes in Québec
More records, surveys & data sources
Where this data comes from
Measurements for Lac Joseph 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: