Seminole-Onora Lake
Seminole County, FloridaMesotrophic
Seminole-Onora Lake is a mesotrophic lake in Seminole County, Florida. Water quality is graded B based on 2 sampling years through 2023. Compared to the 167 other monitored lakes in Seminole County, Seminole-Onora Lake ranks #60 for water quality.
Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2023-07-13. Grade methodology: LakeGrade methodology.
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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 6.8 ft. Phosphorus level: 20.5 µg/L. Trophic State Index: 49.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.8 ft | C |
| Phosphorus | 20.5 µg/L | B |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Location
County Ranking
Ranked #60 of 168 lakes in Seminole County
Cleaner Lakes Within 30 Miles
Seminole-Onora Lake holds Grade B. One nearby lake has a higher grade.
See full comparison →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
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2023-07-13
Monitoring stations: 2
Where to stay near Seminole-Onora Lake
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