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D

Lake Marion

Polk County, FloridaEutrophic

Lake Marion is a productive, nutrient-rich eutrophic lake in Polk County, Florida. Water quality is graded D based on 2 sampling years through 2024. Compared to the 360 other monitored lakes in Polk County, Lake Marion ranks #193 for water quality.

Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2024-03-28. Grade methodology: LakeGrade methodology.

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Swimming Safety

Swimming not recommended, poor water quality with high algae risk

Water Quality Grade: D, Poor

Very murky, less than 2.3 ft of visibility. Phosphorus level: 55 µg/L. Trophic State Index: 64.

MetricValueGrade
Water Clarity (Secchi Depth)2.3 ftF
Phosphorus55 µg/LC
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)64Eutrophic

High nutrients, frequent algae, reduced clarity

Location

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County Ranking

Ranked #193 of 361 lakes in Polk County

Cleaner Lakes Within 30 Miles

Lake Marion holds Grade D. One nearby lake has a higher grade.

See full comparison →

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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 D Lakes in Florida

Flagler-Emerald Lake

Flagler County · Clarity: 1.8 ft

Ftt Lake

Indian River County · Clarity: 2.3 ft

Lake Orlando East

Orange County · Clarity: 2 ft

Lake Rowena

Orange County · Clarity: 3 ft

Lake G

Orange County · Clarity: 2 ft

Putnam-Suggs Lake

Putnam County · Clarity: 2 ft

Eutrophic Lakes in Florida

Lake Lancaster WestFlagler-Emerald LakeEastern Lake OutletSeminole-Secret Lake

Lake Size & Watershed

Watershed (drainage) area
48 sq mi
Surface area
2,760 acres
Mean depth (est.)
13.5 ft
Shoreline
11.6 mi
Elevation
66 ft

Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.

Regulated Pollution Sources Nearby

2 EPA-permitted facilities operate within about 5 miles of Lake Marion under Clean Water Act (NPDES) discharge permits, including 2 classified by the EPA as major dischargers.

  • Lake Hamilton, Town Of
    Lake Hamilton · 1.9 mi away · NPDES FLS266710
    Major
  • Haines City, City Of
    Haines City · 1.9 mi away · NPDES FLS266671
    Major

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)

Lake size & watershed from HydroLAKES (HydroSHEDS)

Grading methodology based on Metropolitan Council standards

Most recent sample: 2024-03-28

Monitoring stations: 1

Where to stay near Lake Marion

Compare lakeside cabins, hotels, and vacation rentals near Lake Marion in Polk County, Florida — live availability and prices for your trip.

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