Matawinie County, Québec · Water Quality Report Card
Lac Dontigny
Lac Dontigny in Matawinie, Québec received a water quality grade of B (Good). Water clarity: 1.7 m visibility. Phosphorus: 9.4 µg/L. Chlorophyll-a (algae): 3.8 µg/L.
- Clarity
- 1.7 m
- Type
- Mesotrophic
Lac Dontigny is a mesotrophic lake in Matawinie County, Québec. Water quality is graded B based on 3 sampling years through 2025. Compared to the 111 other monitored lakes in Matawinie County, Lac Dontigny ranks #91 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 5.6 ft. Phosphorus level: 9.4 µg/L. Chlorophyll-a: 3.8 µg/L. Trophic State Index: 44.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.7 m | D |
| Phosphorus | 9.4 µg/L | A |
| Chlorophyll-a (Algae) | 3.8 µg/L | A |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
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Fishing Lac Dontigny
Location
County Ranking
Ranked #91 of 112 lakes in Matawinie
Cleaner Lakes Within 30 Miles
Lac Dontigny holds Grade B. 5 nearby lakes hold higher grades.
- ALac des PinsMatawinie · 1.6 mi · Higher grade (B → A)
- ALac RougeMatawinie · 1.8 mi · Higher grade (B → A)
- ALac PatrickMatawinie · 2.1 mi · Higher grade (B → A)
- ALac CoutureMatawinie · 2.2 mi · Higher grade (B → A)
- ALac VertMatawinie · 1.3 mi · Higher grade (B → A)
Nearby Lakes in Matawinie
Explore Lac Dontigny 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 Dontigny 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: