Hillsborough-Grady Lake
Hillsborough County, FloridaHypereutrophic
Hillsborough-Grady Lake is a highly nutrient-loaded hypereutrophic lake in Hillsborough County, Florida. Water quality is graded F based on 2 sampling years through 2024. Compared to the 221 other monitored lakes in Hillsborough County, Hillsborough-Grady Lake ranks #195 for water quality.
Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2024-03-07. Grade methodology: LakeGrade methodology.
Watch Hillsborough-Grady Lake water quality
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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 1.8 ft of visibility. Phosphorus level: 107 µg/L. Trophic State Index: 70.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.8 ft | F |
| Phosphorus | 107 µg/L | F |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 70 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Location
County Ranking
Ranked #195 of 222 lakes in Hillsborough County
Cleaner Lakes Within 30 Miles
Hillsborough-Grady Lake holds Grade F. 2 nearby lakes hold higher grades.
- CHillsborough-MohrlakeHillsborough County · 6.1 mi · Two grade letters higher (F → C)
- CHillsborough-Hickory Hammock LakeHillsborough County · 5.5 mi · Two grade letters higher (F → C)
Nearby Lakes in Hillsborough County
More Florida Lake Rankings
Other Grade F Lakes in Florida
Polk County · Clarity: 1.3 ft
Polk County · Clarity: 1 ft
Alachua County · Clarity: 2.4 ft
Volusia County · Clarity: 2 ft
Brevard County · Clarity: 1.6 ft
Highlands County · Clarity: 1 ft
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: 2024-03-07
Monitoring stations: 3
Where to stay near Hillsborough-Grady Lake
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