Where is Cowichan Lake?

Cowichan Lake is a lake in Cowichan, British Columbia. Its water-quality measurements are published by ENV and shown on this page as reported.

Cowichan Lake

Cowichan, British ColumbiaView map Directions

ENV publishes the water-quality measurements for Cowichan Lake. Here is what has been measured.

Clarity

11.1 m

Clearer than most

Secchi · sampled 2026

Phosphorus

2.8 µg/L

Less phosphorus than most

Measured by ENV

Chlorophyll-a

0.6 µg/L

Less algae than most

Measured by ENV

Limited data

See the measurements Directions Where to stay

Cowichan Lake in Cowichan, British Columbia has water-quality measurements published by ENV, shown here as reported. Water clarity: 11.1 m visibility. Phosphorus: 2.8 µg/L. Chlorophyll-a (algae): 0.6 µg/L.

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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. Methodology: how these readings are compared.

What Cowichan Lake is good for

From access and monitoring records, not editorial picks.

Clear water36.4 ft of visibility

Swimming conditions

No reading

Limited data

Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.

Whether Cowichan 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.

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Water quality measurements for Cowichan Lake

These are the measurements ENV publishes for Cowichan Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.

Crystal clear, you can see 36.4 ft down. Phosphorus 2.8 µg/L. Chlorophyll-a 0.6 µg/L. TSI 23.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	11.1m	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	2.8µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	0.6µg/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.	23	Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic

Low nutrients, clear water. No reading is a swimming clearance.

Ask about Cowichan Lake

Answers come straight from the public measurements and survey records on this page.

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Stays near Cowichan Lake

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Fishing Cowichan Lake

→ Cowichan Lake fishing regulations (limits, seasons, special rules)

Nearby Lakes in Cowichan

Michael Lake0.8 m clear21.8 miView →Quennell Lake1.5 m clear22.9 miView →Somenos Lake22.6 miView →Quamichan Lake1.7 m clear24.5 miView →

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 shown on this page as reported.
What is the water quality of Cowichan Lake?: Cowichan Lake in Cowichan, British Columbia has water-quality measurements published by ENV, shown here as reported. 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?: Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.