Lt Banana Lake
Lt Banana Lake in Polk County, Florida has a water quality grade of D (Nutrient-rich). Water clarity: 1.6 ft visibility. Phosphorus: 110 µg/L.
- Clarity
- 1.6 ft
- Typical in July
- 86°F
- Type
- Hypereutrophic
- Trend
- ↑ Improving
Grade D measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near Lt Banana Lake →
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Lt Banana Lake is a highly nutrient-loaded hypereutrophic lake in Polk County, Florida. Water quality is graded D based on 1 sampling years through 2023. Overall water quality is improving over recent sampling years. Compared to the 176 other monitored lakes in Polk County, Lt Banana Lake ranks #166 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2023-10-16. 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.
Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum
Water Quality Grade: D (Nutrient-rich)
Very murky, less than 1.6 ft of visibility. Phosphorus level: 110 µg/L. Trophic State Index: 71.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.6 ft | Not graded |
| Phosphorus | 110 µg/L | Poor |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 71 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Lt Banana Lake
Compare lakeside cabins, hotels, and vacation rentals near Lt Banana Lake in Polk 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. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Lt Banana Lake are listed below.
Top-rated places to stay near Lt Banana Lake
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Planning a whole trip? See where to stay at Florida’s top lakes →
Water Temperature
Lt Banana 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 Jan (about 62°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 41 field readings (2021–2023) via the EPA Water Quality Portal. See the full Lt Banana Lake water temperature breakdown →
Fishing Lt Banana Lake
Water Quality Trend: ↑ Improving
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.06 m/yr | 6 |
| Phosphorus | → Stable | -0.64 µg/L/yr | 6 |
EPA Impairment Status
Lt Banana Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit FL1549B2 · Official waterbody report · Matched by proximity (0.09 km)
County Ranking
Ranked #166 of 177 lakes in Polk County
Nearby Lakes in Polk County
Frequently asked questions about Lt Banana Lake
Where is Lt Banana Lake?
- Lt Banana Lake is a lake in Polk County, Florida. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Lt Banana Lake?
- Lt Banana Lake in Polk County, Florida has a water quality grade of D (Nutrient-rich). Water clarity: 1.6 ft visibility. Phosphorus: 110 µg/L.
Is Lt Banana Lake safe to swim in?
- Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum. Lt Banana Lake has a water quality grade of D (Nutrient-rich). Always check local health department advisories before swimming.
What is the water temperature of Lt Banana Lake?
- Lt Banana Lake typically sits around 86°F at the surface in July, from 41 EPA Water Quality Portal field readings (2021–2023). That is a typical value for the month, not a live reading.
Explore Lt Banana Lake across LakeQuality
More Florida Lake Rankings
Other Grade D Lakes in Florida
Hypereutrophic Lakes in Florida
Where this data comes from
27 measurements from 1 monitoring station, 2021–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples27 samples · 2021–2023
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