Pontiac County, Québec · Water Quality Report Card
Lac Long
Lac Long in Pontiac, Québec received a water quality grade of A (Excellent). Phosphorus: 2.6 µg/L. Chlorophyll-a (algae): 0.5 µg/L.
- Type
- Oligotrophic
Lac Long is a cold, clear oligotrophic lake in Pontiac County, Québec. Water quality is graded A based on 2 sampling years through 2023. Compared to the 17 other monitored lakes in Pontiac County, Lac Long ranks #7 for water quality.
Source: EPA Water Quality Portal sampling records, MELCCFP, last sampled 2023-08-01. Grade methodology: LakeGrade methodology.
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Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
No clarity data. Phosphorus level: 2.6 µg/L. Chlorophyll-a: 0.5 µg/L. Trophic State Index: 21.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 2.6 µg/L | A |
| Chlorophyll-a (Algae) | 0.5 µg/L | A |
| Trophic State Index (TSI) | 21 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
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Fishing Lac Long
Location
County Ranking
Ranked #7 of 18 lakes in Pontiac
Nearby Lakes in Pontiac
Explore Lac Long across LakeGrade
More Québec Lake Rankings
Other Grade A Lakes in Québec
Oligotrophic Lakes in Québec
More records, surveys & data sources
Where this data comes from
Measurements for Lac Long 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: 2023-08-01
Monitoring stations: