Tomkins Lake
Rockland County, New YorkView mapDirections
NY DEC publishes the water-quality measurements for Tomkins Lake. Here is what has been measured.
- Public access
- Limited data
Tomkins Lake in Rockland County, New York has water-quality measurements published by NY DEC, shown here as reported. Water clarity: 5.4 ft visibility.
Tomkins Lake is a lake in Rockland County, New York. Limited fish-species data available. Public access is available.
Source: EPA Water Quality Portal sampling records, NYSDEC, last sampled 2020-09-21. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Tomkins Lake is safe to swim in today is a call for the New York Department of Environmental Conservation and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Tomkins Lake
These are the measurements NY DEC publishes for Tomkins Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 5.4 ft. TSI 53.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 5.4ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 53 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
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Answers come straight from the public measurements and survey records on this page.
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Fishing Tomkins Lake
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.
Nearby Lakes in Rockland County
Frequently asked questions about Tomkins Lake
Where is Tomkins Lake?
- Tomkins Lake is a lake in Rockland County, New York. Its water-quality measurements are published by NY DEC and shown on this page as reported.
What is the water quality of Tomkins Lake?
- Tomkins Lake in Rockland County, New York has water-quality measurements published by NY DEC, shown here as reported. Water clarity: 5.4 ft visibility.
Is Tomkins Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Can I fish at Tomkins Lake?
- Public access to Tomkins Lake is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by New York's fish and wildlife agency, so check its current regulations before you go.
Explore Tomkins Lake across LakeQuality
Planning a trip around Stonewall?
Tomkins Lake is about 37 miles from Stonewall National Monument. Crowds there swing hard by season, so the month you pick changes both how busy the park is and what lodging costs.
Best time to visit Stonewall →More lakes in New York
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Where this data comes from
7 measurements from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- North American Lake Management Society
NALMS7 samples · 2020
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Regulated discharger data from EPA ECHO (ICIS-NPDES)