C

Lake Arnold

Orange County, FloridaEutrophic

Lake Arnold is a productive, nutrient-rich eutrophic lake in Orange County, Florida. Water quality is graded C based on 2 sampling years through 2025. Compared to the 531 other monitored lakes in Orange County, Lake Arnold ranks #284 for water quality.

Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2025-04-24. Grade methodology: LakeGrade methodology.

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Swimming Safety

Generally safe for swimming, moderate water quality

Water Quality Grade: C, Fair

Very murky, less than 3.1 ft of visibility. Phosphorus level: 20.5 µg/L. Trophic State Index: 54.

Metric	Value	Grade
Water Clarity (Secchi Depth)	3.1 ft	D
Phosphorus	20.5 µg/L	B
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 #284 of 532 lakes in Orange County

Cleaner Lakes Within 30 Miles

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

See full comparison →

Nearby Lakes in Orange County

Orange-Arnold Lake

Lake Underhill South

Orange-Giles Lake

Orange-Underhill Lake

More Florida Lake Rankings

Cleanest lakes in Florida

Top 25 by overall water quality score

Best swimming lakes in Florida

Grade A/B + low algae filter

Family fishing lakes in Florida

Panfish-rich, public access

All Florida lakes

Full state directory

Other Grade C Lakes in Florida

Eastern Lake Outlet

Walton County · Clarity: 4.2 ft

Seminole-Secret Lake

Seminole County · Clarity: 4.5 ft

Seminole County · Clarity: 2.9 ft

Polk-Fannie Lake

Polk County · Clarity: 3.5 ft

Volusia-North Talmadge Lake

Volusia County · Clarity: 4.5 ft

Seminole-Spring Lake

Seminole County · Clarity: 3 ft

Eutrophic Lakes in Florida

Flagler-Emerald Lake Eastern Lake Outlet Seminole-Secret Lake Ftt Lake

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Most recent sample: 2025-04-24

Monitoring stations: 2

Where to stay near Lake Arnold

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