Hillsborough-Holly Lake
Hillsborough County, FloridaEutrophic
Hillsborough-Holly Lake is a productive, nutrient-rich eutrophic lake in Hillsborough County, Florida. Water quality is graded B based on 2 sampling years through 2023. Compared to the 221 other monitored lakes in Hillsborough County, Hillsborough-Holly Lake ranks #55 for water quality.
Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2023-07-03. Grade methodology: LakeGrade methodology.
Watch Hillsborough-Holly Lake water quality
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Murky, only visible to about 6.5 ft. Phosphorus level: 24 µg/L. Trophic State Index: 50.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.5 ft | C |
| Phosphorus | 24 µg/L | B |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 50 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Location
County Ranking
Ranked #55 of 222 lakes in Hillsborough County
Cleaner Lakes Within 30 Miles
Hillsborough-Holly Lake holds Grade B. 2 nearby lakes hold higher grades.
- BHillsborough-Harvey LakeHillsborough County · 0.5 mi · Higher overall water quality score
- BLake VirginiaHillsborough County · 0.7 mi · Higher overall water quality score
Nearby Lakes in Hillsborough County
More Florida Lake Rankings
Other Grade B Lakes in Florida
Bay County · Clarity: 4 ft
Brevard County · Clarity: 9.8 ft
Alachua County · Clarity: 5.5 ft
Seminole County · Clarity: 5 ft
Marion County · Clarity: 7 ft
Walton County · Clarity: 4 ft
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: 2023-07-03
Monitoring stations: 3
Where to stay near Hillsborough-Holly Lake
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