Les Pays-d'en-Haut County, Québec · Water Quality Report Card
Lac Johanne
Lac Johanne in Les Pays-d'en-Haut, Québec received a water quality grade of C (Fair). Water clarity: 1.1 m visibility. Phosphorus: 19.3 µg/L. Chlorophyll-a (algae): 14.7 µg/L.
- Clarity
- 1.1 m
- Type
- Eutrophic
Lac Johanne is a productive, nutrient-rich eutrophic lake in Les Pays-d'en-Haut County, Québec. Water quality is graded C based on 3 sampling years through 2025. Compared to the 108 other monitored lakes in Les Pays-d'en-Haut County, Lac Johanne ranks #108 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 3.4 ft. Phosphorus level: 19.3 µg/L. Chlorophyll-a: 14.7 µg/L. Trophic State Index: 54.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.05 m | D |
| Phosphorus | 19.3 µg/L | A |
| Chlorophyll-a (Algae) | 14.7 µg/L | C |
| Trophic State Index (TSI) | 54 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Lac Johanne
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Fishing Lac Johanne
Location
County Ranking
Ranked #108 of 109 lakes in Les Pays-d'en-Haut
Cleaner Lakes Within 30 Miles
Lac Johanne holds Grade C. 5 nearby lakes hold higher grades.
- ALac OuimetLes Pays-d'en-Haut · 0.9 mi · Two grade letters higher (C → A)
- ALac MaroisLes Pays-d'en-Haut · 1.3 mi · Two grade letters higher (C → A)
- BLac SuzanneLes Pays-d'en-Haut · 1.5 mi · Higher grade (C → B)
- BLac CôMe-LalandeLes Pays-d'en-Haut · 0.9 mi · Higher grade (C → B)
- BLac BeaulneLes Pays-d'en-Haut · 1.1 mi · Higher grade (C → B)
Nearby Lakes in Les Pays-d'en-Haut
Explore Lac Johanne 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 Johanne 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: