Lake Petonia is a cold, clear oligotrophic lake in Chenango County, New York. Water quality is graded A based on 1 sampling years through 2022. Overall water quality is improving over recent sampling years. Compared to the 6 other monitored lakes in Chenango County, Lake Petonia ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, New York DNR, last sampled 2022-07-05. Grade methodology: LakeGrade methodology.
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Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Crystal clear, you can see 20.2 ft down. Trophic State Index: 34.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 20.2 ft | A |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 34 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Lake Petonia
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Fishing Lake Petonia
Water Quality Trend: ↑ Improving
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.81 m/yr | 3 |
Location
County Ranking
Ranked #1 of 7 lakes in Chenango County
Nearby Lakes in Chenango County
Explore Lake Petonia across LakeGrade
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Species activity outlook by water temperature and season
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Low nutrients, clear water, excellent for swimming
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More records, surveys & data sources
Regulated Pollution Sources Nearby
3 EPA-permitted facilities operate within about 5 miles of Lake Petonia under Clean Water Act (NPDES) discharge permits. 3 facilities have a reported Clean Water Act violation in the past three years.
- Greene Technologies, IncGreene · 1.3 mi away · NPDES NY0086479Recent violation
- Greene (V) WwtpGreene · 1.5 mi away · NPDES NY0021407Recent violation
- Mirabito Fuel GroupGreene · 1.6 mi away · NPDES NY0157490Recent 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.
Data Sources
Water quality data from the EPA Water Quality Portal
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2022-07-05
Monitoring stations: 1