Warn Lake
Chenango 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.
- Limited data
Warn Lake in Chenango County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 14.1 ft visibility.
- Clarity
- 14.1 ft
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Stays near Warn Lake
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Watch Warn Lake’s letter
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Why Warn Lake has no grade
Warn Lake 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, Warn Lake is Not Rated — not an F. Its 14.1-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.
Warn Lake is a lake in Chenango County, New York.
Source: EPA Water Quality Portal sampling records, NYSDEC, last sampled 2020-09-20. Grade methodology: LakeQuality methodology.
What Warn Lake is good for
From access and monitoring records, not editorial picks.
- Clear water14.1 ft of visibility
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Warn Lake
These readings exist but are not enough for an A–F grade — see why.
Good clarity, visible to about 14.1 ft. TSI 39.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 14.1 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 39 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Fishing Warn Lake
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Warn Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Oxford (V) StpOxford · 4.9 mi away · NPDES NY0156876Recent 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 Chenango County
Frequently asked questions about Warn Lake
Where is Warn Lake?
- Warn Lake is a lake in Chenango 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 Warn Lake?
- Warn Lake in Chenango County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 14.1 ft visibility.
Is Warn Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore Warn Lake 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
Regulated discharger data from EPA ECHO (ICIS-NPDES)