Long Pond is a mesotrophic lake in Columbia County, New York. Water quality is graded B based on 1 sampling years through 2020. Compared to the 4 other monitored lakes in Columbia County, Long Pond ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, New York DNR, last sampled 2020-09-22. Grade methodology: LakeGrade methodology.
Watch Long Pond water quality
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Good clarity, visible to about 10.2 ft. Trophic State Index: 44.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10.2 ft | B |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Long Pond
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Fishing Long Pond
Location
County Ranking
Ranked #3 of 5 lakes in Columbia County
Nearby Lakes in Columbia County
Explore Long Pond across LakeGrade
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Fish species and best lakes in Columbia County
Species activity outlook by water temperature and season
Where to stay at New York's top lakes, each with its grade
Moderate nutrients, good water quality
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More records, surveys & data sources
Regulated Pollution Sources Nearby
3 EPA-permitted facilities operate within about 5 miles of Long Pond under Clean Water Act (NPDES) discharge permits, including 1 classified by the EPA as major discharger. 3 facilities have a reported Clean Water Act violation in the past three years.
- Ancram MillAncram · 2.6 mi away · NPDES NY0006157MajorRecent violation
- Simons General StoreAncram · 2.7 mi away · NPDES NY0282448Recent violation
- Town Highway GarageAncramdale · 3.8 mi away · NPDES NY0282430Recent 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: 2020-09-22
Monitoring stations: 1