Seneca Lake Platform is a cold, clear oligotrophic lake in Seneca County, New York. Water quality is graded A based on 3 sampling years through 2020. The lake supports 3 documented fish species including Brown Trout, Lake Trout, and Landlocked Salmon. Public access is available with 2 public boat landings.
Source: EPA Water Quality Portal sampling records, New York DNR, last sampled 2020-10-20. Grade methodology: LakeGrade methodology.
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Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Good clarity, visible to about 11.5 ft. Phosphorus level: 6 µg/L. Chlorophyll-a: 2.6 µg/L. Trophic State Index: 37.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 11.5 ft | B |
| Phosphorus | 6 µg/L | A |
| Chlorophyll-a (Algae) | 2.6 µg/L | A |
| Trophic State Index (TSI) | 37 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Seneca Lake Platform
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Fish Species
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Fishing Seneca Lake Platform
Recreation & Access
Location
County Ranking
Ranked #1 of 1 lakes in Seneca County
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Low nutrients, clear water, excellent for swimming
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Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Regulated Pollution Sources Nearby
4 EPA-permitted facilities operate within about 5 miles of Seneca Lake Platform under Clean Water Act (NPDES) discharge permits, including 1 classified by the EPA as major discharger. 2 facilities have a reported Clean Water Act violation in the past three years.
- Marsh Creek WwtpGeneva · 3 mi away · NPDES NY0027049MajorRecent violation
- Hillside Water Resource Recovery FacilityRomulus, Town Of · 4.7 mi away · NPDES NY0272116Recent violation
- Atlantic Service StationOntario · 2.8 mi away · NPDES NY0229059
- Long Meadow Mobile Home CourtWaterloo · 4.6 mi away · NPDES NY0099198
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)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Public boat-access points from the USGS National Boat Ramps inventory
Most recent sample: 2020-10-20
Monitoring stations: 1