Seminole-Brantley Lake
Seminole County, FloridaMesotrophic
Seminole-Brantley Lake is a mesotrophic lake in Seminole County, Florida. Water quality is graded B based on 2 sampling years through 2025. Compared to the 167 other monitored lakes in Seminole County, Seminole-Brantley Lake ranks #16 for water quality.
Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2025-04-05. Grade methodology: LakeGrade methodology.
Watch Seminole-Brantley Lake water quality
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Moderate clarity, visible to about 9 ft. Phosphorus level: 15 µg/L. Trophic State Index: 44.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 9 ft | B |
| Phosphorus | 15 µg/L | B |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Location
County Ranking
Ranked #16 of 168 lakes in Seminole County
Cleaner Lakes Within 30 Miles
Seminole-Brantley Lake holds Grade B. 2 nearby lakes hold higher grades.
- ALake BrantleySeminole County · 0.3 mi · Higher grade (B → A)
- AMrrlakeSeminole County · 2 mi · Higher grade (B → A)
Nearby Lakes in Seminole 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
Marion County · Clarity: 7 ft
Hillsborough County · Clarity: 6 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: 2025-04-05
Monitoring stations: 3
Where to stay near Seminole-Brantley Lake
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