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D

Lake Manitoba

Lee County, FloridaEutrophic

Lake Manitoba is a productive, nutrient-rich eutrophic lake in Lee County, Florida. Water quality is graded D based on 2 sampling years through 2025. Compared to the 81 other monitored lakes in Lee County, Lake Manitoba ranks #34 for water quality.

Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2025-05-08. 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: 70 µg/L. Trophic State Index: 65.

MetricValueGrade
Water Clarity (Secchi Depth)2.3 ftF
Phosphorus70 µg/LD
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)65Eutrophic

High nutrients, frequent algae, reduced clarity

Location

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County Ranking

Ranked #34 of 82 lakes in Lee County

Cleaner Lakes Within 30 Miles

Lake Manitoba holds Grade D. 5 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Lee County

D
Saratoga Lake West Outlet
Lee County
C
Lake Kennedy
Lee County
D
Lakes Park @ Center
Lee County
C
Gator Lake Six Mile Cypress
Lee County
C
Hog Branch Lake
Charlotte County
B
Lee-Harborage West Lake
Lee County

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

All Florida lakes

Full state directory

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

Regulated Pollution Sources Nearby

5 EPA-permitted facilities operate within about 5 miles of Lake Manitoba under Clean Water Act (NPDES) discharge permits, including 5 classified by the EPA as major dischargers. 1 facility has a reported Clean Water Act violation in the past three years.

  • Everest Parkway Wrf
    Cape Coral · 2.9 mi away · NPDES FL0030007
    MajorRecent violation
  • Cape Coral, City Of
    Cape Coral · 1.4 mi away · NPDES FLS266949
    Major
  • Waterway Estates Awwtp
    North Fort Myers · 1.7 mi away · NPDES FL0030325
    Major
  • Lee Co & Co App - MS4
    Fort Myers · 3.6 mi away · NPDES FLS000035
    Major
  • Fort Myers, City Of
    Fort Myers · 3.6 mi away · NPDES FLS266884
    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)

Grading methodology based on Metropolitan Council standards

Most recent sample: 2025-05-08

Monitoring stations: 1

Where to stay near Lake Manitoba

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

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