Hillsborough-Francis Lake
Hillsborough County, FloridaEutrophic
Hillsborough-Francis Lake is a productive, nutrient-rich eutrophic lake in Hillsborough County, Florida. Water quality is graded D based on 2 sampling years through 2025. Compared to the 221 other monitored lakes in Hillsborough County, Hillsborough-Francis Lake ranks #144 for water quality.
Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2025-02-26. Grade methodology: LakeGrade methodology.
Watch Hillsborough-Francis Lake water quality
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Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Very murky, less than 2.8 ft of visibility. Phosphorus level: 53 µg/L. Trophic State Index: 62.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.8 ft | F |
| Phosphorus | 53 µg/L | C |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 62 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Location
County Ranking
Ranked #144 of 222 lakes in Hillsborough County
Cleaner Lakes Within 30 Miles
Hillsborough-Francis Lake holds Grade D. 4 nearby lakes hold higher grades.
- BHillsborough-Island Ford LakeHillsborough County · 0.8 mi · Two grade letters higher (D → B)
- BHillsborough-Osceola LakeHillsborough County · 1.1 mi · Two grade letters higher (D → B)
- BHillsborough-Keystone-North LakeHillsborough County · 1.2 mi · Two grade letters higher (D → B)
- BWyndham Lake @ CenterPasco County · 1.3 mi · Two grade letters higher (D → B)
Nearby Lakes in Hillsborough County
More Florida Lake Rankings
Other Grade D Lakes in Florida
Eutrophic Lakes in Florida
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2025-02-26
Monitoring stations: 3
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