Hillsborough-Mill Lake
Hillsborough County, FloridaEutrophic
Hillsborough-Mill Lake is a productive, nutrient-rich eutrophic lake in Hillsborough County, Florida. Water quality is graded D based on 2 sampling years through 2020. Compared to the 221 other monitored lakes in Hillsborough County, Hillsborough-Mill Lake ranks #147 for water quality.
Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2020-12-12. Grade methodology: LakeGrade methodology.
Watch Hillsborough-Mill 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 1.9 ft of visibility. Phosphorus level: 52 µg/L. Trophic State Index: 64.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.9 ft | F |
| Phosphorus | 52 µg/L | C |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 64 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Location
County Ranking
Ranked #147 of 222 lakes in Hillsborough County
Cleaner Lakes Within 30 Miles
Hillsborough-Mill Lake holds Grade D. 4 nearby lakes hold higher grades.
- BHillsborough-Flynn LakeHillsborough County · 1.2 mi · Two grade letters higher (D → B)
- BHillsborough-Burrell LakeHillsborough County · 1.6 mi · Two grade letters higher (D → B)
- CHillsborough-Chapman LakeHillsborough County · 2.8 mi · Higher grade (D → C)
- CHillsborough-Country Lakes PondHillsborough County · 2.6 mi · Higher grade (D → C)
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: 2020-12-12
Monitoring stations: 3
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