Seminole-East Lake
Seminole County, FloridaEutrophic
Seminole-East Lake 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, Seminole-East Lake ranks #122 for water quality.
Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2025-03-19. Grade methodology: LakeGrade methodology.
Watch Seminole-East Lake water quality
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Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Murky, only visible to about 3.5 ft. Phosphorus level: 60.5 µg/L. Trophic State Index: 61.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.5 ft | D |
| Phosphorus | 60.5 µg/L | D |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 61 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Location
County Ranking
Ranked #122 of 168 lakes in Seminole County
Cleaner Lakes Within 30 Miles
Seminole-East Lake holds Grade D. 5 nearby lakes hold higher grades.
- ASeminole-Wildmere LakeSeminole County · 1 mi · Two grade letters higher (D → A)
- AWilmerelk LakeSeminole County · 1 mi · Two grade letters higher (D → A)
- BSeminole-Rock LakeSeminole County · 1.4 mi · Two grade letters higher (D → B)
- CFairy LakeSeminole County · 1.4 mi · Higher grade (D → C)
- CLakalma LakeSeminole County · 1 mi · Higher grade (D → C)
Nearby Lakes in Seminole County
More Florida Lake Rankings
Other Grade D Lakes in Florida
Eutrophic Lakes in Florida
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Seminole-East Lake under Clean Water Act (NPDES) discharge permits.
- Sprague Electronics Ground WatLongwood · 1.7 mi away · NPDES FL0171565
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Data Sources
Water quality data from the EPA Water Quality Portal
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2025-03-19
Monitoring stations: 3
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