Long Pond
Suffolk County, New YorkView mapDirections
Not Rated: one monitoring station are on record, but they measured water clarity only. LakeQuality’s A–F method grades total phosphorus, total nitrogen, chlorophyll-a, and turbidity; clarity is shown, not scored.
- Impaired · Pathogens (E. coli, fecal)
- Limited data
Long Pond in Suffolk County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 4 ft visibility.
- Clarity
- 4 ft
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Watch Long Pond’s letter
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Why Long Pond has no grade
Long Pond has monitoring on record from one station, but only water clarity was measured. LakeQuality’s A–F letter uses total phosphorus, total nitrogen, chlorophyll-a, and turbidity against EPA National Lakes Assessment condition classes. With none of those grading measurements on record, Long Pond is Not Rated — not an F. Its 4-foot median from 8 readings collected 2020 is still shown as clarity, but clarity alone cannot earn a letter.
Not Rated is EPA Integrated Reporting Category 3 — insufficient information. 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.
Long Pond is a lake in Suffolk County, New York.
Source: EPA Water Quality Portal sampling records, NYSDEC, last sampled 2020-09-20. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedBacteria advisory
The letter is not a swimming clearance. Long Pond is listed impaired under Clean Water Act §303(d) (IR 5) for pathogens (E. coli, fecal). Check local advisories before you swim.
Water quality measurements for Long Pond
These readings exist but are not enough for an A–F grade — see why.
Murky, only visible to about 4 ft. TSI 57.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 57 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Fishing Long Pond
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)
Nearby Lakes in Suffolk County
Frequently asked questions about Long Pond
Where is Long Pond?
- Long Pond is a lake in Suffolk County, New York. LakeQuality has not rated this lake (UNRATED) — 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.
What is the water quality grade for Long Pond?
- Long Pond in Suffolk County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 4 ft visibility.
Is Long Pond safe to swim in?
- The letter is not a swimming clearance. Long Pond is listed impaired under Clean Water Act §303(d) (IR 5) for pathogens (E. coli, fecal). Check local advisories before you swim.
Explore Long Pond across LakeQuality
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Where this data comes from
8 measurements from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- North American Lake Management Society
NALMS8 samples · 2020
Monitoring station identifiers (1)
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