Winonanesh Lake
Winonanesh Lake in Lake County, Florida has a water quality grade of B (Good). Water clarity: 4.9 ft visibility. Phosphorus: 40 µg/L.
- Clarity
- 4.9 ft
- Typical in July
- 86°F
- Type
- Eutrophic
- Trend
- ↓ Declining
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Winonanesh Lake is a productive, nutrient-rich eutrophic lake in Lake County, Florida. Water quality is graded B based on 1 sampling years through 2024. Overall water quality is declining over recent sampling years. Compared to the 127 other monitored lakes in Lake County, Winonanesh Lake ranks #71 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2024-07-31. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyBacteria A
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.
Based on E. coli testing, Winonanesh Lake never exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 0% of 11 samples across 3 seasons.
This is a historical summary of past testing, not a current condition — bacteria levels change quickly, especially after rain. Always check Florida’s current beach and health-department advisories before swimming.
Water Quality Grade: B (Good)
Murky, only visible to about 4.9 ft. Phosphorus level: 40 µg/L. Trophic State Index: 56.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.9 ft | Not graded |
| Phosphorus | 40 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 56 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Winonanesh Lake
Compare lakeside cabins, hotels, and vacation rentals near Winonanesh Lake in Lake County, Florida — 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.
Top-rated places to stay near Winonanesh Lake
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Water Temperature
Winonanesh Lake typically sits around 86°F at the surface in July. Summer average is about 86°F. Usually warmest in Jul (about 86°F) and coldest in May (about 82°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 11 field readings (2020–2024) via the EPA Water Quality Portal. See the full Winonanesh Lake water temperature breakdown →
Fishing Winonanesh Lake
Water Quality Trend: ↓ Declining
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.391 m/yr | 6 |
| Phosphorus | → Stable | -0.09 µg/L/yr | 6 |
EPA Impairment Status
Winonanesh Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit FL2839N · Official waterbody report · Matched by proximity (2.02 km)
County Ranking
Ranked #71 of 128 lakes in Lake County
Nearby Lakes in Lake County
Frequently asked questions about Winonanesh Lake
Where is Winonanesh Lake?
- Winonanesh Lake is a lake in Lake County, Florida. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Winonanesh Lake?
- Winonanesh Lake in Lake County, Florida has a water quality grade of B (Good). Water clarity: 4.9 ft visibility. Phosphorus: 40 µg/L.
Is Winonanesh Lake safe to swim in?
- Based on E. coli testing, Winonanesh Lake never exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 0% of 11 samples across 3 seasons. That works out to a bacteria swim-safety grade of A — a historical summary of past testing, not a current reading. Winonanesh Lake has a water quality grade of B (Good). Bacteria levels can spike quickly after heavy rain, so always check Florida's current beach and health-department advisories before you swim.
What is the water temperature of Winonanesh Lake?
- Winonanesh Lake typically sits around 86°F at the surface in July, from 11 EPA Water Quality Portal field readings (2020–2024). That is a typical value for the month, not a live reading.
Explore Winonanesh Lake across LakeQuality
More Florida Lake Rankings
Other Grade B Lakes in Florida
Eutrophic Lakes in Florida
Where this data comes from
20 measurements from 1 monitoring station, 2020–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples20 samples · 2020–2024
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
Impairment status from EPA ATTAINS 303(d) database