Tomkins Lake
Rockland County, New YorkView mapDirections
Not Rated: one monitoring station are on record, but they measured water clarity only. LakeQuality’s A–F method grades total phosphorus, total nitrogen, chlorophyll-a, and turbidity; clarity is shown, not scored.
- Public access
- Limited data
Tomkins Lake in Rockland County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 5.4 ft visibility.
- Clarity
- 5.4 ft
- Public access
- Yes
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Stays near Tomkins Lake
Compare lakeside cabins, hotels, and vacation rentals near Tomkins Lake in Rockland County, New York — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
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Watch Tomkins Lake’s letter
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Why Tomkins Lake has no grade
Tomkins Lake has monitoring on record from one station, but only water clarity was measured. LakeQuality’s A–F letter uses total phosphorus, total nitrogen, chlorophyll-a, and turbidity against EPA National Lakes Assessment condition classes. With none of those grading measurements on record, Tomkins Lake is Not Rated — not an F. Its 5.4-foot median from 7 readings collected 2020 is still shown as clarity, but clarity alone cannot earn a letter.
Not Rated is EPA Integrated Reporting Category 3 — insufficient information. Everything below that has been measured is still reported on this page.
Sampling is run by NYSDEC and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
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. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Tomkins Lake
These readings exist but are not enough for an A–F grade — see why.
Murky, only visible to about 5.4 ft. TSI 53.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.4 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 53 | Eutrophic |
High nutrients, frequent algae, reduced clarity
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. LakeQuality has not rated this lake (UNRATED) — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity.
What is the water quality grade for Tomkins Lake?
- Tomkins Lake in Rockland County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 5.4 ft visibility.
Is Tomkins Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
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 New York Lake Rankings
Other Lakes in New York
Eutrophic Lakes in New York
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)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Regulated discharger data from EPA ECHO (ICIS-NPDES)