Cowichan Lake
Cowichan, British ColumbiaView 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.
- Limited data
Cowichan Lake in Cowichan, British Columbia has water-quality measurements published by ENV and no A–F letter. The letter's EPA reference conditions stop at the US border. Water clarity: 11.1 m visibility. Phosphorus: 2.8 µg/L. Chlorophyll-a (algae): 0.6 µg/L.
- Clarity
- 11.1 m
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Why Cowichan 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 British Columbia, so the scale cannot be applied to Cowichan Lake at any level of sampling. Sampling here has recorded water clarity, phosphorus and algae (chlorophyll-a).
This is not a gap in the monitoring record. ENV publishes these measurements directly, and everything below that has been measured is reported on this page as ENV reports it.
Monitoring: the British Columbia Ministry of Environment and Parks. Read the full grading methodology.
Cowichan Lake is a lake in Cowichan County, British Columbia.
Source: the British Columbia Ministry of Environment and Parks — not the EPA Water Quality Portal, last sampled 2026-04-01. Grade methodology: LakeQuality methodology.
What Cowichan Lake is good for
From access and monitoring records, not editorial picks.
- Clear water36.4 ft of visibility
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Cowichan Lake
These are the measurements ENV publishes for Cowichan Lake. No A–F letter applies here: see why.
Crystal clear, you can see 36.4 ft down. Phosphorus 2.8 µg/L. Chlorophyll-a 0.6 µg/L. TSI 23.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 11.1 m | Measured, not scored |
| Phosphorus | 2.8 µg/L | Measured, not scored |
| Chlorophyll-a (Algae) | 0.6 µg/L | Measured, not scored |
| Trophic State Index (TSI) | 23 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Fishing Cowichan Lake
Nearby Lakes in Cowichan
Frequently asked questions about Cowichan Lake
Where is Cowichan Lake?
- Cowichan Lake is a lake in Cowichan, British Columbia. Its water-quality measurements are published by ENV, 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 Cowichan Lake?
- Cowichan Lake in Cowichan, British Columbia has water-quality measurements published by ENV and no A–F letter. The letter's EPA reference conditions stop at the US border. Water clarity: 11.1 m visibility. Phosphorus: 2.8 µg/L. Chlorophyll-a (algae): 0.6 µg/L.
Is Cowichan Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore Cowichan Lake across LakeQuality
More lakes in British Columbia
Other Lakes in British Columbia
Oligotrophic Lakes in British Columbia
Where this data comes from
203 measurements from 3 monitoring stations, 2017–2026. Retrieved from British Columbia EnMoDS (not the EPA Water Quality Portal) on 2026-09-06.
Collected and reported by
- British Columbia Ministry of Environment and Parks
enmods-bc203 samples · 2017–2026
Monitoring station identifiers (3)
E217507E217509E217508
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.