Hillsboro City Council approved a study of ozone treatment to solve an issue with zebra mussels getting into the city’s water treatment plant. Invasive zebra mussels have become more of a problem at the city’s water treatment plant with workers having to remove a substantial number every two to three days at the pump house. Removing them by hand is a labor-intense process and not a long-term solution. The six-month study will be done in a lab to provide controlled conditions. Ozone has been studied at other facilities for the treatment of zebra mussels, particularly power plants where the problem can be severe.