City of PSL to begin water quality measures at Sawgrass Lakes

Published on September 15, 2025

To protect public health and ensure safe water, the City of Port St. Lucie will begin treatments next week to neutralize blue-green algae and improve water quality at the Sawgrass Lakes Stormwater Management Tract.

Laboratory testing confirmed that blue-green algae detected in the stormwater management tract was not producing harmful toxins. However, to prevent the algal bloom from developing toxins and to ensure the safety of residents, the City will begin treatment on Monday, Sept. 15.

The treatments will take place in two segments. The first will be an application of GreenClean Algaecide to help reduce algal bloom. Four to six days later, MetaFloc will be applied to improve water quality and clarity.

The treatments are non-toxic and safe for humans, pets and marine life. The City met with Sawgrass Lakes residents on Sept. 10 to inform them of the treatment plan.

Staff will continue performing water quality tests to monitor improvements, which are typically expected within the first 48 to 72 hours.

Since Aug. 14, the City has been investigating a fish kill in the Sawgrass Lakes neighborhood. Test results taken in late August confirmed the presence of blue-green algae, which likely formed due to stagnant water and other existing environmental factors. Testing also showed a bacterial infection that was present within the fish played a role in the fish kill.   

The City is actively assessing long-term strategies and solutions for the stormwater tract, including options for enhanced aeration and circulation within the waterway and reestablishment of aquatic vegetation. The City will continue to work closely with the Sawgrass Lakes community to keep residents informed and safe.