Charlevoix County, Québec · Water Quality Report Card
Lac Arthabaska
Lac Arthabaska in Charlevoix, Québec received a water quality grade of B (Good). Water clarity: 2.3 m visibility. Phosphorus: 11.6 µg/L. Chlorophyll-a (algae): 2.8 µg/L.
- Clarity
- 2.3 m
- Type
- Mesotrophic
Lac Arthabaska is a mesotrophic lake in Charlevoix County, Québec. Water quality is graded B based on 3 sampling years through 2025. Compared to the 1 other monitored lakes in Charlevoix County, Lac Arthabaska ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, MELCCFP, last sampled 2025-08-01. Grade methodology: LakeGrade methodology.
Watch Lac Arthabaska water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Moderate clarity, visible to about 7.5 ft. Phosphorus level: 11.6 µg/L. Chlorophyll-a: 2.8 µg/L. Trophic State Index: 43.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.3 m | C |
| Phosphorus | 11.6 µg/L | A |
| Chlorophyll-a (Algae) | 2.8 µg/L | A |
| Trophic State Index (TSI) | 43 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Lac Arthabaska
Compare lakeside cabins, hotels, and vacation rentals near Lac Arthabaska in Charlevoix, Québec — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Lac Arthabaska
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip to Lac Arthabaska?
Get lake water-quality report cards plus the best cabin & lodging deals near Lac Arthabaska — straight to your inbox. No spam, unsubscribe anytime.
Fishing Lac Arthabaska
Location
County Ranking
Ranked #2 of 2 lakes in Charlevoix
Cleaner Lakes Within 30 Miles
Lac Arthabaska holds Grade B. 3 nearby lakes hold higher grades.
- ALac des Bois VertsCharlevoix · 3.3 mi · Higher grade (B → A)
- ALac du Pied des MontsCharlevoix-Est · 18.6 mi · Higher grade (B → A)
- ALac NoirCharlevoix-Est · 23.8 mi · Higher grade (B → A)
Nearby Lakes in Charlevoix
Explore Lac Arthabaska 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 Arthabaska 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: