Greenwood Lake
Orange County, New YorkLimited DataEutrophic
Greenwood Lake is a productive, nutrient-rich eutrophic lake in Orange County, New York. Water quality is graded F based on 1 sampling years through 2025. Compared to the 1 other monitored lakes in Orange County, Greenwood Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, New York DNR, last sampled 2025-10-23. Grade methodology: LakeGrade methodology.
Watch Greenwood Lake water quality
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Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
Very murky, less than 3.1 ft of visibility. Trophic State Index: 61.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.1 ft | F |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 61 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Location
County Ranking
Ranked #2 of 2 lakes in Orange County
Nearby Lakes in Orange County
More New York Lake Rankings
Other Grade F Lakes in New York
Eutrophic Lakes in New York
EPA Impairment Status
Greenwood Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NY1501-0001 · Official waterbody report
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Grading methodology based on Metropolitan Council standards
Most recent sample: 2025-10-23
Monitoring stations: 2