The Milwaukee Metropolitan Sewerage District (MMSD) is a regional government agency that provides water reclamation and flood management services for about 1.1 million people in 28 communities in the Greater Milwaukee Area, Wisconsin. Established in 1921, MMSD operates two water reclamation facilities: Jones Island Water Reclamation Facility and South Shore Water Reclamation Facility. MMSD is known for its innovative approaches to wastewater treatment and environmental protection. The organization manages approximately 300 miles of regional sewers, along with the Deep Tunnel system, which helps prevent sewer overflows during heavy rain events. The Deep Tunnel, completed in 1993, can store up to 521 million gallons of water and wastewater. The district is also recognized for producing Milorganite, a fertilizer created from processed sewage sludge, which has been manufactured at the Jones Island facility since 1926. MMSD has implemented various green infrastructure initiatives, including its Green Infrastructure Partnership Program and the Fresh Coast Guardian Grant Program, which support local efforts to manage stormwater naturally. MMSD operates under the direction of an 11-member commission and is funded primarily through user charges to local communities and property tax levies. The organization maintains compliance with Clean Water Act regulations and holds permits from the Wisconsin Department of Natural Resources.