After completing a successful pilot program, the Tampa Water Department will continue to use ultrasonic technology to reduce algae growth in a cost-effective and environmentally-friendly way in parts of the Hillsborough River Reservoir.
Under the two-year pilot program — which began in March 2023 — two ultrasonic buoys were installed in key locations along the reservoir. The buoys work to reduce algae growth by creating a layer of low-power ultrasound waves at the top of the river, which prevent algae from rising to the water’s surface and getting the sunlight needed to grow. The buoy technology is non-invasive and does not harm fish, plants, zooplankton, or insects.
During the first year of the program, the department was able to significantly reduce the amount of chemicals needed to combat algae growth in the water surrounding the buoys. The following year, no chemicals were used in those areas.
“This is yet another example of the innovative mindset that sets the Tampa Water Department apart and gives the team a pioneering reputation,” said Mayor Jane Castor. “It also reflects Tampa’s commitment to producing the best drinking water possible.”
Algae are typically seen in the reservoir between April and June, when the City of Tampa experiences decreased rainfall, reduced water flow over the dam, and higher temperatures. Algae in the reservoir can impact the taste and odor of treated drinking water.
The pilot study was funded by a $115,254 grant awarded to the Tampa Water Department from the Florida Department of Environmental Protection. Moving forward, the department will continue to use the two ultrasonic buoys and is exploring the possibility of adding more.
