Stagnant Water in Northern Lagoon Fuels Toxic Algae Blooms for Indian River County

Slow-moving, poorly circulating water in the northern Indian River Lagoon is intensifying conditions that fuel toxic algae blooms, according to new peer-reviewed research with direct implications for Indian River County residents who rely on the estuary for recreation, fishing, and drinking water supply.

The study, Jiang M. et al., Estuaries and Coasts, 2023, used computer modeling to map how long water remains trapped in sections of the northern lagoon and how well those sections exchange water with the broader estuary. Researchers found that some areas have dangerously high "residence times" — meaning water sits stagnant long enough for nutrients like nitrogen and phosphorus to concentrate and feed harmful algae growth. Poor connectivity between lagoon segments further limits the lagoon's natural ability to flush pollutants, according to the study.

The findings carry urgent relevance for Indian River and St. Lucie counties, where cyanobacteria blooms have repeatedly closed beaches, sickened wildlife, and prompted public health advisories from the Florida Department of Health in recent years According to available information,. Residents with respiratory conditions, young children, and pets are considered most vulnerable to toxins released during bloom events.

Scientists have long identified nutrient runoff from agriculture and stormwater systems as the primary driver of algae blooms in the lagoon. But this research adds a critical hydrological dimension: even if nutrient loads were reduced, water that cannot circulate will continue to accumulate pollution. The study's modeling approach could help water managers identify specific choke points in the lagoon where targeted interventions — such as improved inlets or flow-through structures — might restore circulation.

The Indian River Lagoon spans roughly 156 miles of Florida's Atlantic coast, with its northern reaches running through Indian River County and forming one of the most biodiverse estuaries in North America. Restoration efforts coordinated through the Indian River Lagoon National Estuary Program are ongoing According to available information,. Residents and advocates can contact the lead author's institution for additional detail on the modeling methodology and its local applications. The full study is available at doi.org/10.1007/s12237-023-01199-6.

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