Polson Lake
Antigonish, Nova Scotia20 haView mapDirections
No A–F letter for this lake. The letter is scored against EPA reference conditions for a lake’s ecoregion, and those stop at the US border. Here is what has been measured.
- 49 ft max depth
- Limited data
Polson Lake in Antigonish, Nova Scotia has water-quality measurements published by NSECC and no A–F letter. The letter's EPA reference conditions stop at the US border. Water clarity: 2.7 m visibility. Maximum depth: 49.2 ft. Surface area: 48.2 acres.
- Clarity
- 2.7 m
- Max depth
- 15 m
- Area
- 20 ha
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Why Polson Lake has no A–F letter
The LakeQuality letter is scored against EPA National Lakes Assessment reference conditions for a lake’s ecoregion, and those stop at the US border. There is no reference condition for Nova Scotia, so the scale cannot be applied to Polson Lake at any level of sampling. Sampling here has recorded water clarity, but not phosphorus and algae (chlorophyll-a).
This is not a gap in the monitoring record. NSECC publishes these measurements directly, and everything below that has been measured is reported on this page as NSECC reports it.
Monitoring: Nova Scotia Environment and Climate Change. Read the full grading methodology.
Polson Lake is a 48-acre lake in Antigonish County, Nova Scotia with a maximum depth of 49 feet (19-foot average).
Source: Nova Scotia Environment and Climate Change — not the EPA Water Quality Portal, last sampled 1976-07-18. Grade methodology: LakeQuality methodology.
What Polson Lake is good for
From access and monitoring records, not editorial picks.
- Deep water49.2 ft surveyed max depth
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Polson Lake
These are the measurements NSECC publishes for Polson Lake. No A–F letter applies here: see why.
Moderate clarity, visible to about 8.9 ft. TSI 46.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.7 m | Measured, not scored |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 46 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 15 m |
| Average Depth | 5.9 m |
| Surface Area | 20 ha |
Fishing Polson Lake
Nearby Lakes in Antigonish
Frequently asked questions about Polson Lake
Where is Polson Lake?
- Polson Lake is a lake in Antigonish, Nova Scotia. Its water-quality measurements are published by NSECC, and it carries no A–F letter, because no reference condition exists for lakes in this region, so the assessment thresholds behind the A–F scale cannot be applied here.
What is the water quality grade for Polson Lake?
- Polson Lake in Antigonish, Nova Scotia has water-quality measurements published by NSECC and no A–F letter. The letter's EPA reference conditions stop at the US border. Water clarity: 2.7 m visibility. Maximum depth: 49.2 ft. Surface area: 48.2 acres.
Is Polson Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
How deep is Polson Lake?
- Polson Lake has a maximum depth of 49.2 feet and an average depth of 19.4 feet. The lake covers 48.2 acres.
Explore Polson Lake across LakeQuality
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Where this data comes from
1 measurement from 1 monitoring station, 1976. Retrieved from Nova Scotia open data (not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- DFO
DFO1 sample · 1976
Monitoring station identifiers (1)
86
Canadian lakes are published with the measurements their provincial programme reports, and without a LakeQuality A–F letter. The letter is scored against EPA reference conditions for a lake’s ecoregion, and the EPA does not survey these lakes. See how grades are calculated and data sources.