Roseland Lake
Windham County, ConnecticutView mapDirections
CT DEEP publishes the water-quality measurements for Roseland Lake. Here is what has been measured.
- Eutrophic
- Impaired · Nutrients (phosphorus, nitrogen)
- Limited data
Roseland Lake in Windham County, Connecticut has water-quality measurements published by CT DEEP, shown here as reported. Phosphorus: 66 µg/L. Chlorophyll-a (algae): 41.8 µg/L.
Roseland Lake is a productive, nutrient-rich eutrophic lake in Windham County, Connecticut. Compared to the 2 other monitored lakes in Windham County, Roseland Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2022-09-15. Methodology: how these readings are compared.
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. Roseland Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Whether Roseland 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 Roseland Lake
These are the measurements CT DEEP publishes for Roseland 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 66 µg/L. Chlorophyll-a 41.8 µg/L. TSI 66.
| 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 | 66µg/L | Poor GoodFairPoor |
| Chlorophyll-a (algae) | 41.8µg/L | Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water. |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 66 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Roseland Lake
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Stays near Roseland Lake
Compare lakeside cabins, hotels, and vacation rentals near Roseland Lake in Windham County, Connecticut — 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. The water-quality readings cover nutrients and algae, not lodging. Cabins and rentals around Roseland Lake are listed below.
Top-rated places to stay near Roseland Lake
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Fishing Roseland Lake
EPA Impairment Status
Roseland 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: Recreation.
Source: EPA ATTAINS assessment unit CT3708-00-1-L1_01 · Official waterbody report
Nearby Lakes in Windham County
Frequently asked questions about Roseland Lake
Where is Roseland Lake?
- Roseland Lake is a lake in Windham County, Connecticut. Its water-quality measurements are published by CT DEEP and shown on this page as reported.
What is the water quality of Roseland Lake?
- Roseland Lake in Windham County, Connecticut has water-quality measurements published by CT DEEP, shown here as reported. Phosphorus: 66 µg/L. Chlorophyll-a (algae): 41.8 µg/L.
Is Roseland Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Roseland Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Explore Roseland Lake across LakeQuality
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Where this data comes from
10 measurements from 1 monitoring station, 2022. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- Connecticut Department Of Energy And Environmental Protection
CT_DEP01_WQX10 samples · 2022
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database