Wononscopomuc Lake
Litchfield County, Connecticut2 acresView mapDirections
CT DEEP publishes the water-quality measurements for Wononscopomuc Lake. Here is what has been measured.
- Oligotrophic
Wononscopomuc Lake in Litchfield County, Connecticut has water-quality measurements published by CT DEEP, shown here as reported. Phosphorus: 17 µg/L. Chlorophyll-a (algae): 1.9 µg/L. Surface area: 2 acres.
Wononscopomuc Lake is a 2-acre cold, clear oligotrophic lake in Litchfield County, Connecticut. Compared to the 11 other monitored lakes in Litchfield County, Wononscopomuc Lake ranks #7 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2024-11-18. Methodology: how these readings are compared.
Swimming conditions
Readings onlyModerate algae
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. Check local advisories before you swim.
Whether Wononscopomuc Lake is safe to swim in today is a call for the Connecticut Department of Energy and Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Wononscopomuc Lake
These are the measurements CT DEEP publishes for Wononscopomuc Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Phosphorus 17 µg/L. Chlorophyll-a 1.9 µg/L. TSI 41.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 17µg/L | Fair GoodFairPoor |
| Chlorophyll-a (algae) | 1.9µg/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. | 41 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
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Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
2 acres
No bathymetric survey has been published for Wononscopomuc Lake, so its depth is not documented here.
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Fishing Wononscopomuc Lake
Reservoir Info (USACE NID)
Wononscopomuc Lake is a man-made reservoir impounded by the Holly Pond Dam, built primarily for recreation on the Factory Brook; earth-type dam, 4 ft tall and 40 ft long.
- Surface area
- 2 ac
- Normal storage
- 0 ac-ft
- Drainage area
- 2.8 sq mi
- Hazard class
- Significant
- Owner
- Town of Salisbury
Source: USACE National Inventory of Dams, NID ID CT01258 · Operator website · Matched by proximity (0.95 km)
Nearby Lakes in Litchfield County
Frequently asked questions about Wononscopomuc Lake
Where is Wononscopomuc Lake?
- Wononscopomuc Lake is a lake in Litchfield County, Connecticut. Its water-quality measurements are published by CT DEEP and shown on this page as reported.
What is the water quality of Wononscopomuc Lake?
- Wononscopomuc Lake in Litchfield County, Connecticut has water-quality measurements published by CT DEEP, shown here as reported. Phosphorus: 17 µg/L. Chlorophyll-a (algae): 1.9 µg/L. Surface area: 2 acres.
Is Wononscopomuc Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Explore Wononscopomuc Lake across LakeQuality
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Where this data comes from
171 measurements from 1 monitoring station, 2020–2024. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- Connecticut Department Of Energy And Environmental Protection
CT_DEP01_WQX171 samples · 2020–2024
Analytical methods
- Total Phosphorus After Block Digestion
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
- Nitrate-Nitrite Nitrogen by Colorimetry
- Turbidity by Nephelometry
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.