Metrogro is the solid material collected at the Madison Metropolitan Sewerage District, referred to as biosolids. Metrogro contains organic material and nutrients that are recycled to farmland as a valuable fertilizer.  Every year, Metrogro is applied to over 5,000 acres of farmland around the Madison area.  Every acre is pre-approved by the WI DNR and checked for in field restrictions prior to any application of Metrogro.