Case study The Madison Metropolitan Sewerage District (MMSD) manages regional wastewater service for the Madison, Wisconsin area, providing wastewater collection and treatment for 43 municipal customers including cities, villages, and utility and sanitary districts. With a total service area of about 180 square miles, MMSD serves a population of around 330,000 and handles an average daily wastewater volume of 42 million gallons per day (MGD

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