Abitibi-Témiscamingue County, Québec · Water Quality Report Card
Lac Opasatica
Lac Opasatica in Abitibi-Témiscamingue, Québec received a water quality grade of B (Good). Water clarity: 1.2 m visibility. Phosphorus: 17.8 µg/L. Chlorophyll-a (algae): 5.4 µg/L.
- Clarity
- 1.2 m
- Type
- Eutrophic
Lac Opasatica is a productive, nutrient-rich eutrophic lake in Abitibi-Témiscamingue County, Québec. Water quality is graded B based on 3 sampling years through 2025. Compared to the 18 other monitored lakes in Abitibi-Témiscamingue County, Lac Opasatica ranks #10 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
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Murky, only visible to about 3.9 ft. Phosphorus level: 17.8 µg/L. Chlorophyll-a: 5.4 µg/L. Trophic State Index: 50.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.2 m | D |
| Phosphorus | 17.8 µg/L | A |
| Chlorophyll-a (Algae) | 5.4 µg/L | B |
| Trophic State Index (TSI) | 50 | Eutrophic |
High nutrients, frequent algae, reduced clarity
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Fishing Lac Opasatica
Location
County Ranking
Ranked #10 of 19 lakes in Abitibi-Témiscamingue
Cleaner Lakes Within 30 Miles
Lac Opasatica holds Grade B. 4 nearby lakes hold higher grades.
- ALac FortuneAbitibi-Témiscamingue · 7.2 mi · Higher grade (B → A)
- BLac ÉVainAbitibi-Témiscamingue · 2.6 mi · Higher overall water quality score
- BLac MudAbitibi-Témiscamingue · 7.5 mi · Higher overall water quality score
- BLac King of the NorthAbitibi-Témiscamingue · 7.7 mi · Higher overall water quality score
Nearby Lakes in Abitibi-Témiscamingue
Explore Lac Opasatica across LakeGrade
More Québec Lake Rankings
Other Grade B Lakes in Québec
Eutrophic Lakes in Québec
More records, surveys & data sources
Where this data comes from
Measurements for Lac Opasatica 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: