Lake Howell
Seminole County, FloridaEutrophic
Lake Howell is a productive, nutrient-rich eutrophic lake in Seminole County, Florida. Water quality is graded D based on 2 sampling years through 2025. Compared to the 167 other monitored lakes in Seminole County, Lake Howell ranks #136 for water quality.
Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2025-05-22. Grade methodology: LakeGrade methodology.
Watch Lake Howell 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 2.6 ft of visibility. Phosphorus level: 44 µg/L. Trophic State Index: 61.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.6 ft | F |
| Phosphorus | 44 µg/L | C |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 61 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Location
County Ranking
Ranked #136 of 168 lakes in Seminole County
Cleaner Lakes Within 30 Miles
Lake Howell holds Grade D. 4 nearby lakes hold higher grades.
- CLkwaumpi LakeOrange County · 1.2 mi · Higher grade (D → C)
- CLkannctr LakeSeminole County · 1 mi · Higher grade (D → C)
- CLake AnnSeminole County · 1 mi · Higher grade (D → C)
- CKewanee LakeSeminole County · 1.2 mi · Higher grade (D → C)
Nearby Lakes in Seminole County
More Florida Lake Rankings
Other Grade D Lakes in Florida
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: 2025-05-22
Monitoring stations: 5
Where to stay near Lake Howell
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