Gardening Tips and Highlights

Milorganite, what is it?

Milorganite is one of the oldest branded fertilizers on the market composed of heat-dried microbes that have digested the organic matter in wastewater. The fertilizer is manufactured by the Milwaukee Metropolitan Sewerage District, where they capture wastewater from the metropolitan Milwaukee area, including local industries such as MillerCoors. 

Using large-scale processes that mimic nature, microbes digest the nutrients found in the water. The cleaned water is returned to Lake Michigan while the microbes are kiln-dried into small pellets. So, Milorganite is actually a bag of dried microbes. 

Wastewater enters the Jones Island water reclamation facility where all solid materials such as sand, boards, shop rags, plastic and debris are first removed. Microbes are added to the water and oxygen is bubbled through the water to create the ideal environment for the microbes to digest the nutrients in the water.

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