Fresh 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. Compared to the 4 other monitored lakes in Suffolk County, Fresh Pond ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, New York DNR, last sampled 2020-09-13. 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 6.5 ft. Trophic State Index: 50.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.5 ft | D |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 50 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Fresh Pond
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Fishing Fresh Pond
Location
County Ranking
Ranked #3 of 5 lakes in Suffolk County
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High nutrients, frequent algae, reduced clarity
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EPA Impairment Status
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 NY1701-0241 · Official waterbody report
Regulated Pollution Sources Nearby
3 EPA-permitted facilities operate within about 5 miles of Fresh Pond under Clean Water Act (NPDES) discharge permits, including 1 classified by the EPA as major discharger. 3 facilities have a reported Clean Water Act violation in the past three years.
- Greenport (V) WwtpGreenport · 3.9 mi away · NPDES NY0020079MajorRecent violation
- Piccozzi PropertyShelter Island Heights · 2 mi away · NPDES NY0267180Recent violation
- Shelter Island Hgts Prop Owners CorpShelter Island Heights · 2.3 mi away · NPDES NY0021814Recent violation
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.
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2020-09-13
Monitoring stations: 1