The Metropolitan Water District is a regional wholesaler and the largest supplier of treated water in the United States. It serves nearly 19 million people in Southern California by delivering water to 26 member public agencies. These agencies, in turn, provide water to cities and local water districts. The district was established in 1928 and has been instrumental in developing the infrastructure necessary to support the region's water needs.

Sustainability Efforts:

• The Metropolitan Water District is committed to sustainability and has implemented various initiatives to ensure a reliable water supply while protecting the environment.
• They have invested in water recycling and groundwater recovery projects to reduce dependency on imported water.
• The district is actively involved in promoting water conservation among its member agencies and the communities they serve.
• Efforts are made to minimize the carbon footprint of their operations, although specific carbon footprint calculations are not readily available.
• They have been recognized for their efforts in sustainable water management, although specific certifications or accreditations are not mentioned.