Milorganite

Milorganite is a brand of biosolids fertilizer produced by the Milwaukee Metropolitan Sewerage District, a contraction of the term Milwaukee Organic Nitrogen. The District captures wastewater from the Milwaukee metropolitan area, including local industries. The solids remaining after the water is treated at the Jones Island Water Reclamation Facility in Milwaukee, Wisconsin are then processed by microbes that digest the organic matter and turn it into organic nitrogen. Cleaned water is then returned to Lake Michigan. The recycled pelletized fertilizer, which is sold throughout North America, reduces the need for manufactured nutrients. After more than 90 years, it is one of the largest and most continuous examples of community-run nonprofit environmental programs.

The name Milorganite is the winning result in a 1925 naming contest held in National Fertilizer Magazine, a contraction of the term Milwaukee Organic Nitrogen. Its history began with Milwaukee’s goal to clean up its rivers and Lake Michigan. Rather than land filling solids left over from waterwater treatment, the sludge was used in a pioneering effort to make, distribute and sell fertilizer. "Its production is among the largest recycling programs in the world."

The Jones Island Plant was the first sewage treatment plant in the United States to succeed in using the activated sludge treatment process to produce an organic fertilizer, and had the largest water treatment capacity of any plant in the world when constructed in 1925. The plant has been designated as a Historic Civil Engineering Landmark by the American Society of Civil Engineers.

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