Quamichan Lake
Cowichan, British ColumbiaView mapDirections
ENV publishes the water-quality measurements for Quamichan Lake. Here is what has been measured.
- Limited data
Quamichan Lake in Cowichan, British Columbia has water-quality measurements published by ENV, shown here as reported. Water clarity: 1.7 m visibility. Phosphorus: 248 µg/L. Chlorophyll-a (algae): 46.7 µg/L.
Quamichan 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 2026-08-04. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Quamichan Lake is safe to swim in today is a call for the British Columbia Ministry of Environment and Parks and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Quamichan Lake
These are the measurements ENV publishes for Quamichan Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 5.6 ft. Phosphorus 248 µg/L. Chlorophyll-a 46.7 µg/L. TSI 68.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 1.7m | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 248µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 46.7µg/L | Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water. |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 68 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
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Frequently asked questions about Quamichan Lake
Where is Quamichan Lake?
- Quamichan Lake is a lake in Cowichan, British Columbia. Its water-quality measurements are published by ENV and shown on this page as reported.
What is the water quality of Quamichan Lake?
- Quamichan Lake in Cowichan, British Columbia has water-quality measurements published by ENV, shown here as reported. Water clarity: 1.7 m visibility. Phosphorus: 248 µg/L. Chlorophyll-a (algae): 46.7 µg/L.
Is Quamichan Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
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Where this data comes from
73 measurements from 2 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-bc73 samples · 2017–2026
Monitoring station identifiers (2)
E207466E309288
Canadian lakes are published with the measurements their provincial programme reports. See where the data comes from and data sources.