CITY OF WINDOM Did you Know Wastewater Biosolids Biosolids are a by-product of wastewater treatment. The Windom Wastewater Treatment Facility produces over 1.2 million gallons of biosolids annually. Biosolids are applied on area farm ground after harvest, providing growers with essential nutrients for the next year's corn crop. Biosolids can supply up to 160 pounds of nitrogen/acre, as well as potassium, phosphorus and other micronutrients. The MPCA regulates the application of biosolids, and WWTP staff must be licensed and maintain licensing with continuing education. In Minnesota, biosolids applications have been conducted since the early 1940s. More than 98% of mechanical wastewater facilities in MN practice biosolids recycling. That's more than 200 communities in Minnesota! 507-831-6129 | 444 9th Street | Windom CITY OF WINDOM Did you Know Wastewater Biosolids Biosolids are a by - product of wastewater treatment . The Windom Wastewater Treatment Facility produces over 1.2 million gallons of biosolids annually . Biosolids are applied on area farm ground after harvest , providing growers with essential nutrients for the next year's corn crop . Biosolids can supply up to 160 pounds of nitrogen / acre , as well as potassium , phosphorus and other micronutrients . The MPCA regulates the application of biosolids , and WWTP staff must be licensed and maintain licensing with continuing education . In Minnesota , biosolids applications have been conducted since the early 1940s . More than 98 % of mechanical wastewater facilities in MN practice biosolids recycling . That's more than 200 communities in Minnesota ! 507-831-6129 | 444 9th Street | Windom