Malletts Bay Lake
Chittenden County, VermontView mapDirections
Vermont DEC publishes the water-quality measurements for Malletts Bay Lake. Here is what has been measured.
- Mesotrophic
- Impaired · Mercury
- Public access
Malletts Bay Lake in Chittenden County, Vermont has water-quality measurements published by Vermont DEC, shown here as reported. Water clarity: 13.8 ft visibility. Phosphorus: 10.2 µg/L. Chlorophyll-a (algae): 4 µg/L.
Malletts Bay Lake is a mesotrophic lake in Chittenden County, Vermont. Limited fish-species data available. Public access is available with 4 public boat landings. Compared to the 7 other monitored lakes in Chittenden County, Malletts Bay Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, VT DEC, last sampled 2025-08-26. Methodology: how these readings are compared.
Malletts Bay Lake has 4 public boat landings, so a lakefront rental is not the only way to get a boat on the water. Vrbo is where to look for cabins and lake homes around Malletts Bay Lake, and Booking.com and Expedia search hotels near the lake for your dates.
What Malletts Bay Lake is good for
From access and monitoring records, not editorial picks.
- Clear water13.8 ft of visibility
- Boat launch4 documented ramps
Swimming conditions
Readings onlyRecreation use not supported
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Malletts Bay Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, nutrients (phosphorus, nitrogen), pCBs. Check local advisories before you swim.
Whether Malletts Bay Lake is safe to swim in today is a call for the Vermont Department of Environmental Conservation and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Malletts Bay Lake
These are the measurements Vermont DEC publishes for Malletts Bay Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Good clarity, visible to about 13.8 ft. Phosphorus 10.2 µg/L. Chlorophyll-a 4 µg/L. TSI 40.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 13.8ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 10.2µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 4µg/L | Good GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 40 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Malletts Bay Lake
Answers come straight from the public measurements and survey records on this page.
Recreation & Access
- Malletts BayPublic
- Colchester PointPublic
- Lamoille RiverPublic
- Bay Harbor MarinaSemi-private
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Stays via Stay22
Stays near Malletts Bay Lake
Compare lakeside cabins, hotels, and vacation rentals near Malletts Bay Lake in Chittenden County, Vermont — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Malletts Bay Lake
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Fishing Malletts Bay Lake
EPA Impairment Status
Malletts Bay Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Fish consumption, Recreation, Other.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit VT05-09L01_01 · Official waterbody report
Nearby Lakes in Chittenden County
Frequently asked questions about Malletts Bay Lake
Where is Malletts Bay Lake?
- Malletts Bay Lake is a lake in Chittenden County, Vermont. Its water-quality measurements are published by Vermont DEC and shown on this page as reported.
What is the water quality of Malletts Bay Lake?
- Malletts Bay Lake in Chittenden County, Vermont has water-quality measurements published by Vermont DEC, shown here as reported. Water clarity: 13.8 ft visibility. Phosphorus: 10.2 µg/L. Chlorophyll-a (algae): 4 µg/L.
Is Malletts Bay Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Malletts Bay Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, nutrients (phosphorus, nitrogen), pCBs. Check local advisories before you swim.
Are there boat ramps on Malletts Bay Lake?
- Malletts Bay Lake has 4 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Malletts Bay, Colchester Point, Lamoille River, Bay Harbor Marina. Public access is listed as yes.
Can I fish at Malletts Bay Lake?
- Malletts Bay Lake has 4 documented boat landings in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Vermont's fish and wildlife agency, so check its current regulations before you go.
Explore Malletts Bay Lake across LakeQuality
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Other Lakes in Vermont
Mesotrophic Lakes in Vermont
Where this data comes from
395 measurements from 2 monitoring stations, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Vermont Dept of Environmental Conservation
1VTDECWQ395 samples · 2020–2025
Analytical methods
- EPA approved Alternate Test Procedure for 4500 P H. Has a 28 day hold without acid preservation.
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
Monitoring station identifiers (2)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Named boat-access points from the USGS National Boat Ramps inventory