The Pont en Daul wastewater treatment plant

Commissioned in 2010 to replace an older one, the Pont en Daul wastewater treatment plant has been managed by Lorient Agglomération since 2014. Its activated sludge treatment eliminates phosphorus, nitrogen and carbon molecules present in wastewater. It has been treating wastewater from nearly 2,500 households in Plouay and Calan since 2017. The purified water is then discharged into the Saint-Sauveur, which is regularly tested for water quality.