Pinellas-Alligator Lake
Pinellas County, FloridaHypereutrophic
Pinellas-Alligator Lake is a highly nutrient-loaded hypereutrophic lake in Pinellas County, Florida. Water quality is graded F based on 2 sampling years through 2023. Compared to the 54 other monitored lakes in Pinellas County, Pinellas-Alligator Lake ranks #46 for water quality.
Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2023-04-01. Grade methodology: LakeGrade methodology.
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Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
Very murky, less than 2.2 ft of visibility. Phosphorus level: 158.5 µg/L. Trophic State Index: 71.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.2 ft | F |
| Phosphorus | 158.5 µg/L | F |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 71 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Location
County Ranking
Ranked #46 of 55 lakes in Pinellas County
Cleaner Lakes Within 30 Miles
Pinellas-Alligator Lake holds Grade F. 3 nearby lakes hold higher grades.
- BChatauqref LakePinellas County · 2.2 mi · Two grade letters higher (F → B)
- BLake ChautauquaPinellas County · 2.1 mi · Two grade letters higher (F → B)
- DPinellas-Cliff Stephens Park LakePinellas County · 1.5 mi · Higher grade (F → D)
Nearby Lakes in Pinellas County
More Florida Lake Rankings
Other Grade F Lakes in Florida
Hypereutrophic Lakes in Florida
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Data Sources
Water quality data from the EPA Water Quality Portal
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2023-04-01
Monitoring stations: 3
Where to stay near Pinellas-Alligator Lake
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