Invasive exotic species are a real threat to the quality of water bodies since when a species becomes established in an ecosystem, it becomes virtually impossible to dislodge it and it is very expensive to control it. Prevention is therefore a necessary measure to preserve the quality of our lakes. In this sense, for any boat that has sailed on a body of water outside Saint-Donat, it is MANDATORY to obtain a washing certificate before being able to access the territory's water bodies again.