Maskinongé County, Québec · Water Quality Report Card
Lac HéRoux
Lac HéRoux in Maskinongé, Québec received a water quality grade of B (Good). Water clarity: 3 m visibility. Phosphorus: 7.8 µg/L. Chlorophyll-a (algae): 3.5 µg/L.
- Clarity
- 3 m
- Type
- Mesotrophic
Lac HéRoux is a mesotrophic lake in Maskinongé County, Québec. Water quality is graded B based on 3 sampling years through 2025. Compared to the 31 other monitored lakes in Maskinongé County, Lac HéRoux ranks #20 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
Moderate clarity, visible to about 9.8 ft. Phosphorus level: 7.8 µg/L. Chlorophyll-a: 3.5 µg/L. Trophic State Index: 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3 m | C |
| Phosphorus | 7.8 µg/L | A |
| Chlorophyll-a (Algae) | 3.5 µg/L | A |
| Trophic State Index (TSI) | 40 | Mesotrophic |
Moderate nutrients, good water quality
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Fishing Lac HéRoux
Location
County Ranking
Ranked #20 of 32 lakes in Maskinongé
Cleaner Lakes Within 30 Miles
Lac HéRoux holds Grade B. 5 nearby lakes hold higher grades.
- ALac VertMaskinongé · 2.6 mi · Higher grade (B → A)
- ALac GareauMaskinongé · 2.6 mi · Higher grade (B → A)
- AGrand Lac LongMaskinongé · 2.8 mi · Higher grade (B → A)
- ALac des ÎLesMaskinongé · 1.8 mi · Higher grade (B → A)
- ALac BellMaskinongé · 2.7 mi · Higher grade (B → A)
Nearby Lakes in Maskinongé
Explore Lac HéRoux 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 HéRoux 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: