2024 Ranking of Concern 12 out of 45
Water Quality Grade 2024
F
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The Dunes: Lake 4

26.45515, -82.05254

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Data Summary
Nutrients
2025 2024 2023
IN N/A 0.405 0.444
TN N/A 2.69 8.1
OP N/A 0.033 0.344
TP N/A 0.17 0.69
Chl-a N/A 56.4 241.5
TSI N/A 81.3 86.3
Salinity N/A 17.6 30.8
DO N/A 4.8 7.1

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The Dunes: Lake 4 has a current ranking of concern of 12 out of 45. We’ve analyzed 84 water bodies on Sanibel Island, and ranked them from 1 (most concerned) to 84 (least concerned) .

. . . . . = State Criteria: measurements above this line suggest impairment to the waterbody.
Historical Data
Rankings
  • 2025 Ranking: Not tested
  • 2024 Ranking: 12
  • 2023 Ranking: 3
  • 2022 Ranking: 39
  • 2020 Ranking: 30
  • 2018 Ranking: 23
  • 2016 Ranking: 36
Water Quality Grade
  • 2025 Grade: Not tested
  • 2024 Grade: F
  • 2023 Grade: F
  • 2022 Grade: D
  • 2020 Grade: D
  • 2018 Grade: F
  • 2016 Grade: D