Loon Lake is a cold, clear oligotrophic lake in Steuben County, New York. Water quality is graded A based on 1 sampling years through 2020. Compared to the 3 other monitored lakes in Steuben County, Loon Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, New York DNR, last sampled 2020-09-30. Grade methodology: LakeGrade methodology.
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Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Good clarity, visible to about 14.8 ft. Trophic State Index: 38.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 14.8 ft | A |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 38 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Loon Lake
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Fishing Loon Lake
Location
County Ranking
Ranked #1 of 4 lakes in Steuben County
Nearby Lakes in Steuben County
Explore Loon Lake across LakeGrade
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Low nutrients, clear water, excellent for swimming
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Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Regulated Pollution Sources Nearby
3 EPA-permitted facilities operate within about 5 miles of Loon Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Wayland (V) StpWayland · 4.9 mi away · NPDES NY0032999Recent violation
- Cohocton Bus GarageCohocton · 3.3 mi away · NPDES NY0245739
- The Gunlocke CompanyWayland · 4.4 mi away · NPDES NY0088153
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.
Data Sources
Water quality data from the EPA Water Quality Portal
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2020-09-30
Monitoring stations: 1