Earlville Lake
Madison 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
Earlville Lake in Madison County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 7.8 ft visibility.
- Clarity
- 7.8 ft
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Watch Earlville Lake’s letter
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Why Earlville Lake has no grade
Earlville 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, Earlville Lake is Not Rated — not an F. Its 7.8-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.
Earlville Lake is a lake in Madison County, New York.
Source: EPA Water Quality Portal sampling records, NYSDEC, last sampled 2020-09-22. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Earlville Lake
These readings exist but are not enough for an A–F grade — see why.
Moderate clarity, visible to about 7.8 ft. TSI 48.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7.8 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 48 | Mesotrophic |
Moderate nutrients, good water quality
Fishing Earlville Lake
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Frequently asked questions about Earlville Lake
Where is Earlville Lake?
- Earlville Lake is a lake in Madison 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 Earlville Lake?
- Earlville Lake in Madison County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 7.8 ft visibility.
Is Earlville Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
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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.