C

Lake Mobile

Seminole County, FloridaEutrophic

Lake Mobile 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, Lake Mobile ranks #72 for water quality.

Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2025-07-22. Grade methodology: LakeGrade methodology.

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Swimming Safety

Generally safe for swimming, moderate water quality

Water Quality Grade: C, Fair

Murky, only visible to about 5.6 ft. Phosphorus level: 30 µg/L. Trophic State Index: 53.

Metric	Value	Grade
Water Clarity (Secchi Depth)	5.6 ft	C
Phosphorus	30 µg/L	C
Chlorophyll-a (Algae)	No data
Trophic State Index (TSI)	53	Eutrophic

High nutrients, frequent algae, reduced clarity

Location

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County Ranking

Ranked #72 of 168 lakes in Seminole County

Cleaner Lakes Within 30 Miles

Lake Mobile holds Grade C. 5 nearby lakes hold higher grades.

See full comparison →

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More Florida Lake Rankings

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Top 25 by overall water quality score

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Grade A/B + low algae filter

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Panfish-rich, public access

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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: 2025-07-22

Monitoring stations: 1

Where to stay near Lake Mobile

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