Protecting public health and the drinking water supply for millions of people takes the expertise of hundreds of specially skilled and dedicated employees. The Milwaukee Metropolitan Sewerage District (MMSD) is a highly regarded national leader in wastewater treatment, flood management, and green infrastructure. MMSD is a regional governmental agency serving over one million people in Greater Milwaukee. Our mission is to protect public health and the environment through world-class, cost-effective water resource management, leadership, and partnership. Join our diverse team and support your community while protecting our environment. A recipient of the U.S. Water Prize and many other awards, we are most proud of our record for capturing and cleaning 98.5% wastewater, since 1994, from our 29 communities in a 423-square-mile area. Many metropolitan areas struggle to capture and clean the national goal of 85% of all the rain and wastewater that enters their sewer systems.