Long Pond is a productive, nutrient-rich eutrophic lake in Suffolk County, New York. Water quality is graded D based on 1 sampling years through 2020. Limited fish-species data available. Public access is available. Compared to the 4 other monitored lakes in Suffolk County, Long Pond ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, New York DNR, last sampled 2020-09-20. Grade methodology: LakeGrade methodology.
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Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Murky, only visible to about 4 ft. Trophic State Index: 57.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4 ft | D |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 57 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Long Pond
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Fishing Long Pond
Location
County Ranking
Ranked #4 of 5 lakes in Suffolk County
Nearby Lakes in Suffolk County
Explore Long Pond across LakeGrade
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Species activity outlook by water temperature and season
Where to stay at New York's top lakes, each with its grade
High nutrients, frequent algae, reduced clarity
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More records, surveys & data sources
EPA Impairment Status
Long Pond is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NY1701-0035 · Official waterbody report · Matched by proximity (2.94 km)
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2020-09-20
Monitoring stations: 1