Roseland Lake
Roseland Lake in Windham County, Connecticut has a water quality grade of D (Nutrient-rich). Phosphorus: 66 µg/L. Chlorophyll-a (algae): 41.8 µg/L.
- Type
- Eutrophic
Grade D measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near Roseland Lake →
Roseland Lake is a productive, nutrient-rich eutrophic lake in Windham County, Connecticut. Water quality is graded D based on 2 sampling years through 2022. 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. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum
Water Quality Grade: D (Nutrient-rich)
No clarity data. Phosphorus level: 66 µg/L. Chlorophyll-a: 41.8 µg/L. Trophic State Index: 66.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 66 µg/L | Poor |
| Chlorophyll-a (Algae) | 41.8 µg/L | Not graded |
| Trophic State Index (TSI) | 66 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay 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 grade measures 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
Source: EPA ATTAINS assessment unit CT3708-00-1-L1_01 · Official waterbody report · Matched by proximity (0.05 km)
County Ranking
Ranked #3 of 3 lakes in Windham County
Nearby Lakes in Windham County
Frequently asked questions about Roseland Lake
Where is Roseland Lake?
- Roseland Lake is a lake in Windham County, Connecticut. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Roseland Lake?
- Roseland Lake in Windham County, Connecticut has a water quality grade of D (Nutrient-rich). Phosphorus: 66 µg/L. Chlorophyll-a (algae): 41.8 µg/L.
Is Roseland Lake safe to swim in?
- Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum. Roseland Lake has a water quality grade of D (Nutrient-rich). Algae concentration (chlorophyll-a) is 41.8 µg/L. Always check local health department advisories before swimming.
Explore Roseland Lake across LakeGrade
More Connecticut Lake Rankings
Other Grade D Lakes in Connecticut
Eutrophic Lakes in Connecticut
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)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database