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

Arrow Lake

Upper Arrow Lake, British ColumbiaView map Directions

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

Phosphorus

4.1 µg/L

Less phosphorus than most

Measured by ENV

Chlorophyll-a

2.3 µg/L

Typical for British Columbia

Measured by ENV

Limited data

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Arrow Lake in Upper Arrow Lake, British Columbia has water-quality measurements published by ENV, shown here as reported. Phosphorus: 4.1 µg/L. Chlorophyll-a (algae): 2.3 µg/L.

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Arrow Lake is a lake in Upper Arrow Lake County, British Columbia.

Source: the British Columbia Ministry of Environment and Parks — not the EPA Water Quality Portal, last sampled 2026-08-25. 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 Arrow 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 Arrow Lake

These are the measurements ENV publishes for Arrow 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 4.1 µg/L. Chlorophyll-a 2.3 µg/L. TSI 32.

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	4.1µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	2.3µg/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.	32	Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic

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

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Fishing Arrow Lake

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

Nearby Lakes in Upper Arrow Lake

Trout Lake16.3 m clear24.5 miView →Sugar Lake9.4 m clear27.1 miView →Slocan Lake16.3 m clear36.6 miView →Mabel Lake12.8 m clear37.5 miView →Arrow Lake61.7 miView →Mara Lake7.5 m clear55.4 miView →

Frequently asked questions about Arrow Lake

Where is Arrow Lake?: Arrow Lake is a lake in Upper Arrow Lake, British Columbia. Its water-quality measurements are published by ENV and shown on this page as reported.
What is the water quality of Arrow Lake?: Arrow Lake in Upper Arrow Lake, British Columbia has water-quality measurements published by ENV, shown here as reported. Phosphorus: 4.1 µg/L. Chlorophyll-a (algae): 2.3 µg/L.
Is Arrow Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.