Greenwood Lake
Orange County, New YorkView mapDirections
NY DEC publishes the water-quality measurements for Greenwood Lake. Here is what has been measured.
- Impaired · Nutrients (phosphorus, nitrogen)
- Limited data
Greenwood Lake in Orange County, New York has water-quality measurements published by NY DEC, shown here as reported. Water clarity: 3.1 ft visibility.
Greenwood Lake is a lake in Orange County, New York.
Source: EPA Water Quality Portal sampling records, NYSDEC, last sampled 2025-10-23. Methodology: how these readings are compared.
If you are planning to stay, you can search lake houses and cabins around Greenwood Lake on Vrbo, or look for a hotel room near the lake on Booking.com or Expedia.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Greenwood Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Whether Greenwood Lake is safe to swim in today is a call for the New York Department of Environmental Conservation and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Greenwood Lake
These are the measurements NY DEC publishes for Greenwood Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 3.1 ft of visibility. TSI 61.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 3.1ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | No reading 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. | 61 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Greenwood Lake
Answers come straight from the public measurements and survey records on this page.
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Stays near Greenwood Lake
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Fishing Greenwood Lake
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
Regulated Pollution Sources Nearby
7 EPA-permitted facilities operate within about 5 miles of Greenwood Lake under Clean Water Act (NPDES) discharge permits, including 1 classified by the EPA as major discharger. 4 facilities have a reported Clean Water Act violation in the past three years.
- Warwick (V) WwtpWarwick · 5 mi away · NPDES NY0023680MajorRecent violation
- Mountain Lake ParkWarwick · 3.6 mi away · NPDES NY0062448Recent violation
- Ibm Sterling ForestSterling Forest · 3.6 mi away · NPDES NY0021695Recent violation
- Warwick Sewer District 1 StpWarwick · 4.8 mi away · NPDES NY0021890Recent violation
- Greenwood Lake (V) Water Filtration PlantGreenwood Lake · 1.9 mi away · NPDES NY0272876
- Warwick Shoprite CenterWarwick · 3.7 mi away · NPDES NY0103501
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Nearby Lakes in Orange County
Frequently asked questions about Greenwood Lake
Where is Greenwood Lake?
- Greenwood Lake is a lake in Orange County, New York. Its water-quality measurements are published by NY DEC and shown on this page as reported.
What is the water quality of Greenwood Lake?
- Greenwood Lake in Orange County, New York has water-quality measurements published by NY DEC, shown here as reported. Water clarity: 3.1 ft visibility.
Is Greenwood Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Greenwood Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Explore Greenwood Lake across LakeQuality
Depth, room, public access, and the state wake-sport rules
20.8 mi away · 77 ft
Species activity outlook by water temperature and season
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Planning a trip around Delaware Water Gap?
Greenwood Lake is about 34 miles from Delaware Water Gap National Recreation Area. Crowds there swing hard by season, so the month you pick changes both how busy the park is and what lodging costs.
Best time to visit Delaware Water Gap →More lakes in New York
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Where this data comes from
6 measurements from 2 monitoring stations, 2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Princeton Hydro LLC
PRINCETONHYDRO6 samples · 2025
Monitoring station identifiers (2)
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)