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Lake Marion

Polk County, FloridaView mapDirections

No nutrient or algae sampling on record from Florida DEP for this lake.

Trend
Stable
6 years of samples
  • Impaired · Algal growth
  • Limited data
See the measurementsDirectionsWhere to stay

Lake Marion in Polk County, Florida has water-quality measurements published by Florida DEP, shown here as reported.

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Lake Marion is a lake in Polk County, Florida. Water clarity is declining over recent sampling years.

Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2024-03-28. Methodology: how these readings are compared.

Swimming conditions

No reading

Recreation use not supported

Nutrient and algae readings are not a swimming clearance. Lake Marion is listed impaired under Clean Water Act §303(d) (IR 4A) for algal growth, mercury, nutrients (phosphorus, nitrogen). Check local advisories before you swim.

Whether Lake Marion is safe to swim in today is a call for the Florida Department of Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

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Water quality measurements for Lake Marion

These are the measurements Florida DEP publishes for Lake Marion, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.

No clarity data.

Ask about Lake Marion

Answers come straight from the public measurements and survey records on this page.

→ Lake Marion water level: the live USGS gauge reading

Stays via Stay22

Stays near Lake Marion

Compare lakeside cabins, hotels, and vacation rentals near Lake Marion in Polk County, Florida — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.

Top-rated places to stay near Lake Marion

Prices for Oct 16–18, 4 adults. Change dates on the map below.

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Planning a whole trip? See where to stay at Florida’s top lakes →

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Fishing Lake Marion

Water Quality Trend: Stable

Based on 6 years of monitoring (2020–2025).

  • Water clarity

    Worsening

    6 years

  • Phosphorus

    Improving

    -1.69 µg/L/yr6 years

See year-by-year chart →

EPA Impairment Status

Lake Marion is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4A).

Causes of impairment

Algal growthMercuryNutrients (phosphorus, nitrogen)

Designated uses not supporting: Aquatic life, Fish consumption, Recreation.

A Total Maximum Daily Load (TMDL) plan has been approved.

Source: EPA ATTAINS assessment unit FL1480 · Official waterbody report

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.

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

Nearby Lakes in Polk County

Deer Lake—View →Lake Trask—View →Laketracy5.5 miView →Lkmariese Lake6.6 ft clear—View →Lake Sara—View →Lkjoe Lake11.2 ft clear—View →

Frequently asked questions about Lake Marion

Where is Lake Marion?

Lake Marion is a lake in Polk County, Florida. Its water-quality measurements are published by Florida DEP and shown on this page as reported.

What is the water quality of Lake Marion?

Lake Marion in Polk County, Florida has water-quality measurements published by Florida DEP, shown here as reported.

Measurements on this page ↑

Is Lake Marion safe to swim in?

Nutrient and algae readings are not a swimming clearance. Lake Marion is listed impaired under Clean Water Act §303(d) (IR 4A) for algal growth, mercury, nutrients (phosphorus, nitrogen). Check local advisories before you swim.

Swimming on this page ↑

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Where this data comes from

2 measurements from 1 monitoring station, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.

Collected and reported by

  • Submitting organization not recorded for these samples2 samples · 2024
Monitoring station identifiers (1)

EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.

Other records on this page

Impairment status from EPA ATTAINS 303(d) database

Regulated discharger data from EPA ECHO (ICIS-NPDES)