Lyonnaise des Eaux, a subsidiary of Suez Environment, is a French organization that supplies drinking water and treats wastewater. It develops new environmental services (resource protection, monitoring and maintaining the quality of aquatic environments and biodiversity) and habitat management (Diagnostic water , recovery of rainwater etc.).

Lyonnaise des Eauxemploys 12 000 employees, supplies drinking water to 12 million people and treats wastewater of more than 9.4 million people in France.

The protection of water resources, in quantity and quality, is at the center of its concerns. To collectively ensure the future of water, Lyonnaise des Eaux launched the Contract for the health of the water in 2011, a modernized partnership with communities bringing innovative proposals on governance, innovation and economic model. The effectiveness of the commitments is under the control of Vigeo, an independent agency of extra-financial rating.