Hillsborough-Keystone-North Lake
Hillsborough County, FloridaMesotrophic
Hillsborough-Keystone-North Lake is a mesotrophic lake in Hillsborough County, Florida. Water quality is graded B based on 2 sampling years through 2025. Compared to the 221 other monitored lakes in Hillsborough County, Hillsborough-Keystone-North Lake ranks #50 for water quality.
Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2025-04-13. Grade methodology: LakeGrade methodology.
Watch Hillsborough-Keystone-North 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 5 ft. Phosphorus level: 15 µg/L. Trophic State Index: 49.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5 ft | C |
| Phosphorus | 15 µg/L | B |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Location
County Ranking
Ranked #50 of 222 lakes in Hillsborough County
Cleaner Lakes Within 30 Miles
Hillsborough-Keystone-North Lake holds Grade B. 3 nearby lakes hold higher grades.
- AHillsborough-Alice LakeHillsborough County · 1 mi · Higher grade (B → A)
- BHillsborough-Island Ford LakeHillsborough County · 0.4 mi · Higher overall water quality score
- BHillsborough-Keystone LakeHillsborough County · 1 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
Mesotrophic 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: 2025-04-13
Monitoring stations: 3
Where to stay near Hillsborough-Keystone-North Lake
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