Little 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
Little Long Pond in Suffolk County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 10 ft visibility.
- Clarity
- 10 ft
Stays via Stay22
Stays near Little Long Pond
Compare lakeside cabins, hotels, and vacation rentals near Little Long Pond in Suffolk 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 Little Long Pond
Prices for Sep 11–13, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at New York’s top lakes →
Watch Little Long Pond’s letter
Email me if this lake’s grade moves. Grades stay free.
Or email
Why Little Long Pond has no grade
Little 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, Little Long Pond is Not Rated — not an F. Its 10-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.
Little 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.
What Little Long Pond is good for
From access and monitoring records, not editorial picks.
- Clear water10 ft of visibility
Swimming Safety
Not ratedBacteria advisory
The letter is not a swimming clearance. Little 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 Little Long Pond
These readings exist but are not enough for an A–F grade — see why.
Good clarity, visible to about 10 ft. TSI 44.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Fishing Little Long Pond
EPA Impairment Status
Little 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 (2.69 km)
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Little Long Pond under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Sag Harbor (V) WwtpSag Harbor · 1.8 mi away · NPDES NY0028908Recent 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.
Nearby Lakes in Suffolk County
Frequently asked questions about Little Long Pond
Where is Little Long Pond?
- Little 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 Little Long Pond?
- Little Long Pond in Suffolk County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 10 ft visibility.
Is Little Long Pond safe to swim in?
- The letter is not a swimming clearance. Little 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 Little Long Pond across LakeQuality
More New York Lake Rankings
Other Lakes in New York
Mesotrophic Lakes in New York
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)