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LakeQuality

Data Report · Updated July 2026

The State of Florida’s Lakes 2026

Of 2,195 monitored lakes in Florida, 32.4% earn a water-quality grade of A or B and 37.8% score D or F (average grade C). Highlands-Sirena Lake is the cleanest;

2,195
Monitored lakes graded
C
Average grade
32.4%
Grade A or B
0%
On impaired list

Florida grade distribution

A
B
C
D
F
A: 202 (9.2%)B: 509 (23.2%)C: 655 (29.8%)D: 528 (24.1%)F: 301 (13.7%)

Cleanest lakes in Florida

Highest combined water-quality score, 2026.

  1. 1.AHighlands-Sirena Lake — Highlands County16.0 ft clarity · 8 µg/L P
  2. 2.AHighlands-Verona Lake — Highlands County13.2 ft clarity · 12 µg/L P
  3. 3.AVolusia-Winnemissett Lake — Volusia County14.0 ft clarity · 10 µg/L P
  4. 4.APutnam-Barco Lake — Putnam County17.0 ft clarity · 8 µg/L P
  5. 5.AHighlands-Denton Lake — Highlands County23.4 ft clarity · 5 µg/L P
  6. 6.AOrange-Down Lake — Orange County14.5 ft clarity · 10 µg/L P
  7. 7.ALake-Sellers — Lake County13.3 ft clarity · 8 µg/L P
  8. 8.AOrange-Conway North Lake — Orange County13.2 ft clarity · 12 µg/L P
  9. 9.AOrange-Little Conway Lake — Orange County15.0 ft clarity · 11 µg/L P
  10. 10.ADown Lake — Orange County16.1 ft clarity · 6 µg/L P

Most-polluted lakes

Lowest combined water-quality score among monitored lakes.

  1. 1.FPolk-Little Bass Lake — Polk County1.3 ft clarity · 411 µg/L P
  2. 2.FPolk-Big Bass Lake — Polk County1.0 ft clarity · 399 µg/L P
  3. 3.FAlachua-Wauberg Lake — Alachua County2.4 ft clarity · 124 µg/L P
  4. 4.FLake Roberta — Hillsborough County1.3 ft clarity · 116 µg/L P
  5. 5.FLwc Lake — Brevard County1.6 ft clarity · 107 µg/L P
  6. 6.FHighlands-Wolf Lake — Highlands County1.0 ft clarity · 230 µg/L P
  7. 7.FFebin Lake — Glades County1.0 ft clarity · 154 µg/L P
  8. 8.FNcenter Lake — Okeechobee County1.0 ft clarity · 121 µg/L P
  9. 9.FSaddle Crk Pk Y Lake — Polk County2.3 ft clarity · 107 µg/L P
  10. 10.FHillsborough-Teakwood Lake — Hillsborough County2.3 ft clarity · 105 µg/L P

Worst algae hotspots

Highest measured chlorophyll-a (algae) concentration.

  1. 1.DLake Okeechobee — Martin County23 µg/L chlorophyll-a

Grades combine Secchi clarity, total phosphorus, and chlorophyll-a from the EPA Water Quality Portal and state agencies. See the full methodology, the national State of America’s Lakes report, or all Florida lakes.

Cite this report: LakeQuality, “The State of Florida’s Lakes 2026,” lakequality.org/report/fl.