MARTIN COUNTY, Fla. - Some residents who live along the St. Lucie River in Martin County are concerned about what they're seeing in the water.
It's an algae bloom that they say looks like a sheen of green antifreeze.
The Martin County Health Department said test results are pending to determine whether the algae is toxic to people and pets.
According to the health department sunlight, temperatures, physical conditions, precipitation and the water's nutrients contribute to the formation of a bloom. It says not all algae are toxic and it's not possible to tell by looking at the bloom with the naked eye.
If you spot blue green algae, or a suspected algae bloom, you're urged to contact the Department of Environmental protection at (772) 467-5572.