What is the water quality grade for Malletts Bay Lake?

Malletts Bay Lake in Chittenden County, Vermont received a water quality grade of A (Excellent). Water clarity: 13.8 ft visibility. Phosphorus: 9.2 µg/L. Chlorophyll-a (algae): 4.1 µg/L.

Is Malletts Bay Lake safe to swim in?

Excellent for swimming, crystal clear water with minimal algae. Malletts Bay Lake has an overall water quality grade of A. Algae concentration (chlorophyll-a) is 4.1 µg/L. Always check local health department advisories before swimming.

Chittenden County, Vermont

Malletts Bay Lake

Grade AExcellent · 13.8 ft clarity

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Oligotrophic

Malletts Bay Lake is a cold, clear oligotrophic lake in Chittenden County, Vermont. Water quality is graded A based on 3 sampling years through 2025. Compared to the 7 other monitored lakes in Chittenden County, Malletts Bay Lake ranks #2 for water quality.

Source: EPA Water Quality Portal sampling records, Vermont DNR, last sampled 2025-08-26. Grade methodology: LakeGrade methodology.

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Swimming Safety

Excellent for swimming, crystal clear water with minimal algae

Water Quality Grade: A, Excellent

Good clarity, visible to about 13.8 ft. Phosphorus level: 9.2 µg/L. Chlorophyll-a: 4.1 µg/L. Trophic State Index: 40.

Metric	Value	Grade
Water Clarity (Secchi Depth)	13.8 ft	B
Phosphorus	9.2 µg/L	A
Chlorophyll-a (Algae)	4.1 µg/L	A
Trophic State Index (TSI)	40	Oligotrophic

Low nutrients, clear water, excellent for swimming

Where to stay near Malletts Bay Lake

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