Seneca Lake Platform
Seneca County, New YorkView mapDirections
Clarity, phosphorus, and algae all sit in the cleanest band for this region.
- Mesotrophic
- #1 of 1 in the county
- Public access
- Limited data
Seneca Lake Platform in Seneca County, New York has a water quality grade of A (Excellent). Water clarity: 11.5 ft visibility. Phosphorus: 8 µg/L. Chlorophyll-a (algae): 2.8 µg/L.
- Clarity
- 11.5 ft
- Type
- Mesotrophic
- Public access
- Yes
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Seneca Lake Platform is a mesotrophic lake in Seneca County, New York. Water quality is graded A based on 2 sampling years through 2020. Limited fish-species data available. Public access is available with 3 public boat landings.
Source: EPA Water Quality Portal sampling records, NYSDEC, last sampled 2020-10-20. Grade methodology: LakeQuality methodology.
What Seneca Lake Platform is good for
From access and monitoring records, not editorial picks.
- Clear water11.5 ft of visibility
- Boat launch3 documented ramps
Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: A (Excellent)
Good clarity, visible to about 11.5 ft. Phosphorus 8 µg/L. Chlorophyll-a 2.8 µg/L. TSI 39. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 11.5 ft | Not graded |
| Phosphorus | 8 µg/L | Good |
| Chlorophyll-a (Algae) | 2.8 µg/L | Good |
| Trophic State Index (TSI) | 39 | Mesotrophic |
Moderate nutrients, good water quality
Recreation & Access
- Oak Island, Mile 12.36Public
- Seneca Lake State Park, Mile 17.1Public
- Geneva, Mile 17.51Public
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Seneca Lake Platform
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.
County Ranking
Ranked #1 of 1 lakes in Seneca County
Nearby Lakes in Seneca County
Frequently asked questions about Seneca Lake Platform
Where is Seneca Lake Platform?
- Seneca Lake Platform is a lake in Seneca County, New York. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Seneca Lake Platform?
- Seneca Lake Platform in Seneca County, New York has a water quality grade of A (Excellent). Water clarity: 11.5 ft visibility. Phosphorus: 8 µg/L. Chlorophyll-a (algae): 2.8 µg/L.
Is Seneca Lake Platform safe to swim in?
- The A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Are there boat ramps on Seneca Lake Platform?
- Seneca Lake Platform has 3 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Oak Island, Mile 12.36, Seneca Lake State Park, Mile 17.1, Geneva, Mile 17.51. Public access is listed as yes.
Explore Seneca Lake Platform across LakeQuality
16 mi away · cable-pulled, no boat wake
Species activity outlook by water temperature and season
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Moderate nutrients, good water quality
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Where this data comes from
108 measurements from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- USGS New York Water Science Center
USGS-NY108 samples · 2020
Analytical methods
- P, wu, WCA, persulfate CF color
- Plant pigments, sonication & 445
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)
Named boat-access points from the USGS National Boat Ramps inventory