Sumnerlk Lake
Sumnerlk Lake in Lake County, Florida has a water quality grade of B (Good). Water clarity: 5.6 ft visibility. Phosphorus: 27.6 µg/L.
- Clarity
- 5.6 ft
- Max depth
- ~36 ft est.
- Type
- Eutrophic
- Trend
- ↓ Declining
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Sumnerlk Lake is a productive, nutrient-rich eutrophic lake in Lake County, Florida with an estimated average depth of about 36 feet. Water quality is graded B based on 1 sampling years through 2025. Overall water quality is declining over recent sampling years. Compared to the 127 other monitored lakes in Lake County, Sumnerlk Lake ranks #89 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-07-21. Grade methodology: LakeQuality methodology.
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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.
Good for swimming, clear water with low algae levels
Water Quality Grade: B (Good)
Murky, only visible to about 5.6 ft. Phosphorus level: 27.6 µg/L. Trophic State Index: 52.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.6 ft | Not graded |
| Phosphorus | 27.6 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 52 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Sumnerlk Lake
Compare lakeside cabins, hotels, and vacation rentals near Sumnerlk 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 Sumnerlk Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~36 ft est. |
| Average Depth | ~9 ft est. |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Florida has not published bathymetry for Sumnerlk Lake.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Fishing Sumnerlk Lake
Water Quality Trend: ↓ Declining
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.37 m/yr | 3 |
| Phosphorus | ↓ Declining | +4.8 µg/L/yr | 3 |
County Ranking
Ranked #89 of 128 lakes in Lake County
Nearby Lakes in Lake County
Frequently asked questions about Sumnerlk Lake
Where is Sumnerlk Lake?
- Sumnerlk 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 Sumnerlk Lake?
- Sumnerlk Lake in Lake County, Florida has a water quality grade of B (Good). Water clarity: 5.6 ft visibility. Phosphorus: 27.6 µg/L.
Is Sumnerlk Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Sumnerlk Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
How deep is Sumnerlk Lake?
- No published bathymetric survey covers Sumnerlk Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 36 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Explore Sumnerlk Lake across LakeQuality
More Florida Lake Rankings
Other Grade B Lakes in Florida
Eutrophic Lakes in Florida
Where this data comes from
11 measurements from 1 monitoring station, 2023–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples11 samples · 2023–2025
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
Lake size & watershed from HydroLAKES (HydroSHEDS)