What is the water quality grade for Northeast Arm Lake?

Northeast Arm Lake in Grand Isle County, Vermont received a water quality grade of B (Good). Water clarity: 13.3 ft visibility. Phosphorus: 19.6 µg/L. Chlorophyll-a (algae): 5.1 µg/L.

Is Northeast Arm Lake safe to swim in?

Good for swimming, clear water with low algae levels. Northeast Arm Lake has an overall water quality grade of B. Algae concentration (chlorophyll-a) is 5.1 µg/L. Always check local health department advisories before swimming.

Grand Isle County, Vermont · 44.69°N

Northeast Arm Lake

Grade BGood · 13.3 ft clarity

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Mesotrophic

Northeast Arm Lake is a mesotrophic lake in Grand Isle County, Vermont. Water quality is graded B based on 3 sampling years through 2025. Compared to the 2 other monitored lakes in Grand Isle County, Northeast Arm Lake ranks #2 for water quality.

Source: EPA Water Quality Portal sampling records, Vermont DNR, last sampled 2025-08-21. Grade methodology: LakeGrade methodology.

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Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

Good clarity, visible to about 13.3 ft. Phosphorus level: 19.6 µg/L. Chlorophyll-a: 5.1 µg/L. Trophic State Index: 45.

Metric	Value	Grade
Water Clarity (Secchi Depth)	13.3 ft	B
Phosphorus	19.6 µg/L	A
Chlorophyll-a (Algae)	5.1 µg/L	B
Trophic State Index (TSI)	45	Mesotrophic

Moderate nutrients, good water quality

Where to stay near Northeast Arm Lake

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