Lake Marian Blue‑Green Algae Alert: What You Need to Know

The Osceola County health department has issued a fresh warning after a May 11 water test confirmed the presence of dangerous toxins in Lake Marian. This is not the first time the county has faced this issue; similar alerts surfaced earlier in 2023 and again in 2022.

What to Watch For

• Green or discolored water
• Unusual odors

Avoid swimming, wading, or riding personal watercrafts in any affected areas. If you come into contact with algae or see discolored water, wash skin and clothes immediately with soap.

Protecting Your Pets

• Animals that drink or play in contaminated water can become ill.
• Provide clean, fresh drinking options instead of lake water.
• Do not use lake water for cooking or dishwashing—boiling does not eliminate toxins.

Food Safety

• Fresh fish from an algae‑bloomed lake can be safe if handled properly:
• Rinse under tap or bottled water.
• Discard the guts.
• Cook the flesh thoroughly.
• Shellfish should be avoided entirely, as they can concentrate toxins.

Why It Happens

Blue‑green algae thrive in Florida’s warm, still waters. They multiply rapidly under abundant sunlight and nutrients, forming blooms that appear as green scum or foam. Even when a bloom is not visible, bacteria may still be present.

Stay Informed

These blooms can appear at any time but are more common during summer and fall. Keep an eye on local alerts and follow the safety tips above to protect yourself, your family, and your pets.