Abitibi-Témiscamingue County, Québec · Water Quality Report Card
Lac Marlon
Lac Marlon in Abitibi-Témiscamingue, Québec received a water quality grade of B (Good). Water clarity: 1.5 m visibility. Phosphorus: 22.4 µg/L. Chlorophyll-a (algae): 4.4 µg/L.
- Clarity
- 1.5 m
- Type
- Mesotrophic
Lac Marlon is a mesotrophic 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 Marlon ranks #11 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 4.9 ft. Phosphorus level: 22.4 µg/L. Chlorophyll-a: 4.4 µg/L. Trophic State Index: 49.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.5 m | D |
| Phosphorus | 22.4 µg/L | B |
| Chlorophyll-a (Algae) | 4.4 µg/L | A |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
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Fishing Lac Marlon
Location
County Ranking
Ranked #11 of 19 lakes in Abitibi-Témiscamingue
Cleaner Lakes Within 30 Miles
Lac Marlon holds Grade B. 3 nearby lakes hold higher grades.
- ALac OsiskoAbitibi-Témiscamingue · 3.6 mi · Higher grade (B → A)
- ALac DufaultAbitibi-Témiscamingue · 4.5 mi · Higher grade (B → A)
- BLac MudAbitibi-Témiscamingue · 11 mi · Higher overall water quality score
Nearby Lakes in Abitibi-Témiscamingue
Explore Lac Marlon across LakeGrade
More Québec Lake Rankings
Other Grade B Lakes in Québec
Mesotrophic Lakes in Québec
More records, surveys & data sources
Where this data comes from
Measurements for Lac Marlon 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: