Application of a glyphosate-based herbicide to Phragmites australis: Impact on groundwater and near-shore lake water at a beach on Georgian Bay

► Invasive Phragmites australis (common reed) is destroying beaches. ► Glyphosate-based herbicide effective in eradicating Phragmites at beaches. ► Application produced very low concentrations of glyphosate in lake and groundwater. ► Concentrations in groundwater dissipate exponentially within a few weeks.