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2025 Ranking of Concern 24 out of 39
Water Quality Grade 2025
C
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Sanibel Communities for Clean Water > Communities

The Dunes: Lake 4

26.45515, -82.05254

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Data Summary
Nutrients
2025 2024 2023
IN 0.0650.4050.444
TN 0.912.698.1
OP 0.0090.0330.344
TP 0.090.170.69
Chl-a 27.356.4241.5
TSI 66.381.386.3
Salinity 16.617.630.8
DO 64.87.1

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The most recent samples from The Dunes: Lake 4 were taken in 2025, where it ranked 24 out of 39 sites tested that year. In this dataset, a ranking of 1 represents the most impaired site, while 39 represents the least impaired.

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BMPs (Best Management Practices) implemented at The Dunes: Lake 4:

No BMPs have been reported at this location yet.

. . . . . = State Criteria: measurements above this line suggest impairment to the waterbody.
Historical Data
Rankings
  • 2025 Ranking: 24 out of 39 sites tested
  • 2024 Ranking: 12 out of 46 sites tested
  • 2023 Ranking: 3 out of 23 sites tested
  • 2022 Ranking: 39 out of 84 sites tested
  • 2020 Ranking: 30 out of 84 sites tested
  • 2018 Ranking: 23 out of 78 sites tested
  • 2016 Ranking: 36 out of 78 sites tested
Water Quality Grade
  • 2025 Grade: C
  • 2024 Grade: F
  • 2023 Grade: F
  • 2022 Grade: D
  • 2020 Grade: D
  • 2018 Grade: F
  • 2016 Grade: D
Most Impaired - Top 5
Least Impaired - Top 5
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