Lake Derby
Orleans County, VermontView mapDirections
No nutrient or algae sampling on record from Vermont DEC for this lake.
- Limited data
Lake Derby in Orleans County, Vermont has water-quality measurements published by Vermont DEC, shown here as reported.
Lake Derby is a lake in Orleans County, Vermont.
Source: EPA Water Quality Portal sampling records, VT DEC, last sampled 2024-05-07. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Lake Derby 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 Lake Derby
These are the measurements Vermont DEC publishes for Lake Derby, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data.
Ask about Lake Derby
Answers come straight from the public measurements and survey records on this page.
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Stays near Lake Derby
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Fishing Lake Derby
Nearby Lakes in Orleans County
Frequently asked questions about Lake Derby
Where is Lake Derby?
- Lake Derby is a lake in Orleans County, Vermont. Its water-quality measurements are published by Vermont DEC and shown on this page as reported.
What is the water quality of Lake Derby?
- Lake Derby in Orleans County, Vermont has water-quality measurements published by Vermont DEC, shown here as reported.
Is Lake Derby safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
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Where this data comes from
4 measurements from 1 monitoring station, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Vermont Dept of Environmental Conservation
1VTDECWQ4 samples · 2024
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
- 2130 B ~ Nephelometric Method
Monitoring station identifiers (1)
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.