Unknown Pond
Essex County, VermontView mapDirections
No nutrient or algae sampling on record from Vermont DEC for this lake.
- Impaired · pH / acidity
- Limited data
Unknown Pond in Essex County, Vermont has water-quality measurements published by Vermont DEC, shown here as reported.
Unknown Pond is a lake in Essex County, Vermont.
Source: EPA Water Quality Portal sampling records, VT DEC, last sampled 2024-05-24. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Unknown Pond is listed impaired under Clean Water Act §303(d) (IR 5) for pH / acidity. Check local advisories before you swim.
Whether Unknown Pond 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 Unknown Pond
These are the measurements Vermont DEC publishes for Unknown Pond, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data.
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Answers come straight from the public measurements and survey records on this page.
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Fishing Unknown Pond
EPA Impairment Status
Unknown Pond 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: Aquatic life.
Source: EPA ATTAINS assessment unit VT16-13L04 · Official waterbody report
Nearby Lakes in Essex County
Frequently asked questions about Unknown Pond
Where is Unknown Pond?
- Unknown Pond is a lake in Essex County, Vermont. Its water-quality measurements are published by Vermont DEC and shown on this page as reported.
What is the water quality of Unknown Pond?
- Unknown Pond in Essex County, Vermont has water-quality measurements published by Vermont DEC, shown here as reported.
Is Unknown Pond safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Unknown Pond is listed impaired under Clean Water Act §303(d) (IR 5) for pH / acidity. Check local advisories before you swim.
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Where this data comes from
3 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
1VTDECWQ3 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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database