Johns Lake
Orange County, FloridaEutrophic
Johns Lake is a productive, nutrient-rich eutrophic lake in Orange County, Florida. Water quality is graded B based on 2 sampling years through 2025. Compared to the 531 other monitored lakes in Orange County, Johns Lake ranks #235 for water quality.
Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2025-08-20. Grade methodology: LakeGrade methodology.
Watch Johns 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 5.2 ft. Phosphorus level: 23 µg/L. Trophic State Index: 51.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.2 ft | C |
| Phosphorus | 23 µg/L | B |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 51 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Location
County Ranking
Ranked #235 of 532 lakes in Orange County
Cleaner Lakes Within 30 Miles
Johns Lake holds Grade B. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Orange 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
Hillsborough County · Clarity: 6 ft
Eutrophic 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: 2025-08-20
Monitoring stations: 6
Where to stay near Johns Lake
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