Greenwood Lake
Greenwood Lake in Orange County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 3.1 ft visibility.
- Clarity
- 3.1 ft
Next lake in Orange County
Why Greenwood Lake has no grade
We grade a lake only when its monitoring record clears the evidence bar: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Greenwood Lake, the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. Sampling here has recorded water clarity, but not phosphorus and algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by NYSDEC and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Greenwood Lake is a lake in Orange County, New York.
Source: EPA Water Quality Portal sampling records, NYSDEC, last sampled 2025-10-23. Grade methodology: LakeGrade methodology.
Watch Greenwood Lake water quality
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Greenwood Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Very murky, less than 3.1 ft of visibility. Trophic State Index: 61.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.1 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 61 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Greenwood Lake
Compare lakeside cabins, hotels, and vacation rentals near Greenwood Lake in Orange County, New York — 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.
Top-rated places to stay near Greenwood Lake
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Planning a whole trip? See where to stay at New York’s top lakes →
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
What is the water quality grade for Greenwood Lake?
- Greenwood Lake in Orange County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 3.1 ft visibility.
Is Greenwood Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Greenwood Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Explore Greenwood Lake across LakeGrade
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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New York's cleanest and most-polluted lakes, ranked
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 New York Lake Rankings
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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)
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)