Tomkins Lake is a productive, nutrient-rich eutrophic lake in Rockland County, New York. Water quality is graded D based on 1 sampling years through 2020. Limited fish-species data available. Public access is available with 2 public boat landings. Compared to the 1 other monitored lakes in Rockland County, Tomkins Lake ranks #1 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
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Murky, only visible to about 5.4 ft. Trophic State Index: 53.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.4 ft | D |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 53 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Tomkins Lake
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Fishing Tomkins Lake
Recreation & Access
Location
County Ranking
Ranked #1 of 2 lakes in Rockland County
Nearby Lakes in Rockland County
Explore Tomkins Lake across LakeGrade
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Species activity outlook by water temperature and season
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High nutrients, frequent algae, reduced clarity
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More records, surveys & data sources
Regulated Pollution Sources Nearby
23 EPA-permitted facilities operate within about 5 miles of Tomkins Lake under Clean Water Act (NPDES) discharge permits, including 3 classified by the EPA as major dischargers. 9 facilities have a reported Clean Water Act violation in the past three years.
- Indian Point Energy CenterBuchanan · 1.9 mi away · NPDES NY0004472MajorRecent violation
- Lovett Generating StationTomkins Cove · 1.1 mi away · NPDES NY0005711Major
- Peekskill Sanitary Sd WwtpPeekskill · 3.7 mi away · NPDES NY0100803Major
- Lovett Solid Waste Fac #44S07Tomkins Cove · 1.1 mi away · NPDES NY0166456Recent violation
- Certainteed Gypsum Buchanan LlcBuchanan · 2.2 mi away · NPDES NY0006645Recent violation
- Wheelabrator Westchester LpPeekskill · 2.5 mi away · NPDES NY0109690Recent 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
Public boat-access points from the USGS National Boat Ramps inventory
Most recent sample: 2020-09-21
Monitoring stations: 1