C

Deep Lake

Seminole County, FloridaEutrophic

Deep Lake is a productive, nutrient-rich eutrophic lake in Seminole County, Florida. Water quality is graded C based on 2 sampling years through 2025. Compared to the 167 other monitored lakes in Seminole County, Deep Lake ranks #70 for water quality.

Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2025-06-02. Grade methodology: LakeGrade methodology.

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Swimming Safety

Generally safe for swimming, moderate water quality

Water Quality Grade: C, Fair

Moderate clarity, visible to about 6.9 ft. Phosphorus level: 44 µg/L. Trophic State Index: 54.

Metric	Value	Grade
Water Clarity (Secchi Depth)	6.9 ft	C
Phosphorus	44 µg/L	C
Chlorophyll-a (Algae)	No data
Trophic State Index (TSI)	54	Eutrophic

High nutrients, frequent algae, reduced clarity

Location

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County Ranking

Ranked #70 of 168 lakes in Seminole County

Cleaner Lakes Within 30 Miles

Deep Lake holds Grade C. 3 nearby lakes hold higher grades.

See full comparison →

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Other Grade C Lakes in Florida

Lake Lancaster West

Orange County · Clarity: 3.5 ft

Eastern Lake Outlet

Walton County · Clarity: 4.2 ft

Polk-Fannie Lake

Polk County · Clarity: 3.5 ft

Volusia-North Talmadge Lake

Volusia County · Clarity: 4.5 ft

Oyster Lake Middle

Walton County · Clarity: 3 ft

Alachua-Elizabeth Lake

Alachua County · Clarity: 3 ft

Eutrophic Lakes in Florida

Lake Lancaster West Flagler-Emerald Lake Eastern Lake Outlet Ftt Lake

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Most recent sample: 2025-06-02

Monitoring stations: 2

Where to stay near Deep Lake

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