Big Fresh Pond is a mesotrophic lake in Suffolk County, New York. Water quality is graded C based on 1 sampling years through 2020. Compared to the 4 other monitored lakes in Suffolk County, Big Fresh Pond ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, New York DNR, last sampled 2020-09-19. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Moderate clarity, visible to about 7.5 ft. Trophic State Index: 48.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7.5 ft | C |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 48 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Big Fresh Pond
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Fishing Big Fresh Pond
Location
County Ranking
Ranked #2 of 5 lakes in Suffolk County
Nearby Lakes in Suffolk County
Explore Big Fresh Pond across LakeGrade
Fish species and top-graded lakes across New York
Species activity outlook by water temperature and season
Where to stay at New York's top lakes, each with its grade
Moderate nutrients, good water quality
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Other Grade C Lakes in New York
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More records, surveys & data sources
EPA Impairment Status
Big Fresh Pond 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 NY1701-0125 · Official waterbody report · Matched by proximity (0.4 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: 2020-09-19
Monitoring stations: 1