Where is Kootenay Lake?

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

Kootenay Lake

Kootenay Lake, British ColumbiaView map Directions

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

Phosphorus

5 µg/L

Typical for British Columbia

Measured by ENV

Chlorophyll-a

2.5 µg/L

Typical for British Columbia

Measured by ENV

Limited data

See the measurements Directions Where to stay

Kootenay Lake in Kootenay Lake, British Columbia has water-quality measurements published by ENV, shown here as reported. Phosphorus: 5 µg/L. Chlorophyll-a (algae): 2.5 µg/L.

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Kootenay Lake is a lake in Kootenay Lake County, British Columbia.

Source: the British Columbia Ministry of Environment and Parks — not the EPA Water Quality Portal, last sampled 2026-08-17. Methodology: how these readings are compared.

Swimming conditions

No reading

Limited data

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

Whether Kootenay 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 Kootenay Lake

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

No clarity data. Phosphorus 5 µg/L. Chlorophyll-a 2.5 µg/L. TSI 33.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)		No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	5µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	2.5µg/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.	33	Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic

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

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

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Fishing Kootenay Lake

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

Nearby Lakes in Kootenay Lake

Moyie Lake6 m clear53.7 miView →Slocan Lake16.3 m clear30.4 miView →St. Mary's Lake3.4 m clear31 miView →Trout Lake16.3 m clear63.3 miView →Lillian Lake5.4 m clear63.9 miView →Columbia Lake4.3 m clear57.5 miView →

Frequently asked questions about Kootenay Lake

Where is Kootenay Lake?: Kootenay Lake is a lake in Kootenay Lake, British Columbia. Its water-quality measurements are published by ENV and shown on this page as reported.
What is the water quality of Kootenay Lake?: Kootenay Lake in Kootenay Lake, British Columbia has water-quality measurements published by ENV, shown here as reported. Phosphorus: 5 µg/L. Chlorophyll-a (algae): 2.5 µg/L.
Is Kootenay Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.