Indian Lake is a cold, clear oligotrophic lake in Putnam County, New York. Water quality is graded A based on 1 sampling years through 2020. Limited fish-species data available. Public access is available. Compared to the 12 other monitored lakes in Putnam County, Indian Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, New York DNR, last sampled 2020-09-21. 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 24.8 ft down. Trophic State Index: 31.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 24.8 ft | A |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 31 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Indian Lake
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Fishing Indian Lake
Location
County Ranking
Ranked #2 of 13 lakes in Putnam County
Nearby Lakes in Putnam County
Explore Indian Lake across LakeGrade
Fish species and top-graded lakes across New York
Species activity outlook by water temperature and season
Where to stay at New York's top lakes, each with its grade
Low nutrients, clear water, excellent for swimming
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More records, surveys & data sources
EPA Impairment Status
Indian Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit NY1301-0143 · Official waterbody report
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Regulated Pollution Sources Nearby
5 EPA-permitted facilities operate within about 5 miles of Indian Lake under Clean Water Act (NPDES) discharge permits, including 2 classified by the EPA as major dischargers. 4 facilities have a reported Clean Water Act violation in the past three years.
- Target Hill WwtpWest Point · 4.4 mi away · NPDES NY0023761MajorRecent violation
- Highland Falls (V) WwtpHighland Falls · 4.5 mi away · NPDES NY0022586MajorRecent violation
- Walter Hoving HomeGarrison · 1.2 mi away · NPDES NY0145459Recent violation
- American Water West Point DewateringWest Point · 4.4 mi away · NPDES NY0281549Recent violation
- Garrison Station PlazaGarrison · 3.2 mi away · NPDES NY0274607
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
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2020-09-21
Monitoring stations: 1