Lake Jefferson
Lake Jefferson in Sullivan County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 42 acres.
- Area
- 42 acres
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Why Lake Jefferson has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Lake Jefferson, no water-quality sampling on record for this lake.
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. 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.
Lake Jefferson is a 42-acre lake in Sullivan County, New York.
Source: EPA Water Quality Portal sampling records, NYSDEC, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch Lake Jefferson water quality
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Swimming Safety
Not ratedElevated nutrients
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Lake Jefferson
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Trophic State Index: undefined.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) |
Where to stay near Lake Jefferson
Compare lakeside cabins, hotels, and vacation rentals near Lake Jefferson in Sullivan 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 Lake Jefferson
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 42 acres |
No bathymetric survey has been published for Lake Jefferson, so its depth is not documented here.
Fishing Lake Jefferson
Nearby Lakes in Sullivan County
Frequently asked questions about Lake Jefferson
Where is Lake Jefferson?
- Lake Jefferson is a lake in Sullivan County, New York. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Lake Jefferson?
- Lake Jefferson in Sullivan County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 42 acres.
Is Lake Jefferson safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Lake Jefferson is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Explore Lake Jefferson across LakeQuality
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Where this data comes from
Measurements for Lake Jefferson come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.