La Vallée-de-l'Or County, Québec · Water Quality Report Card
Lac Malartic
Lac Malartic in La Vallée-de-l'Or, Québec received a water quality grade of C (Fair). Water clarity: 0.5 m visibility. Phosphorus: 33.9 µg/L. Chlorophyll-a (algae): 4.4 µg/L.
- Clarity
- 0.5 m
- Type
- Eutrophic
Lac Malartic is a productive, nutrient-rich eutrophic lake in La Vallée-de-l'Or County, Québec. Water quality is graded C based on 3 sampling years through 2023. Compared to the 6 other monitored lakes in La Vallée-de-l'Or County, Lac Malartic ranks #6 for water quality.
Source: EPA Water Quality Portal sampling records, MELCCFP, last sampled 2023-08-01. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Very murky, less than 1.5 ft of visibility. Phosphorus level: 33.9 µg/L. Chlorophyll-a: 4.4 µg/L. Trophic State Index: 57.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 0.45 m | F |
| Phosphorus | 33.9 µg/L | C |
| Chlorophyll-a (Algae) | 4.4 µg/L | A |
| Trophic State Index (TSI) | 57 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Lac Malartic
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Fishing Lac Malartic
Location
County Ranking
Ranked #6 of 7 lakes in La Vallée-de-l'Or
Cleaner Lakes Within 30 Miles
Lac Malartic holds Grade C. 5 nearby lakes hold higher grades.
- ALac LegendreAbitibi · 17.9 mi · Two grade letters higher (C → A)
- BLac BeauchampAbitibi · 23.1 mi · Higher grade (C → B)
- BLac PreissacAbitibi · 12.9 mi · Higher grade (C → B)
- BLac LemoineLa Vallée-de-l'Or · 17.9 mi · Higher grade (C → B)
- BLac JoannèSAbitibi-Témiscamingue · 25.8 mi · Higher grade (C → B)
Nearby Lakes in La Vallée-de-l'Or
Explore Lac Malartic 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 Malartic 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: 2023-08-01
Monitoring stations: