Louisville Green

Did you know that MSD has its own organic-based, slow-release fertilizer called Louisville Green? To create it, first, MSD treats wastewater at one of five Wastewater Water Quality Treatment Centers (WQTC) before discharging it into local waterways. During this process, the biosolids are removed.

These biosolids are heat-dried at high temperatures, which eliminates harmful pathogens and creates a nontoxic, earthy-smelling pelletized fertilizer called Louisville Green. Since 2004 Louisville Green has been used by sod farmers and home owners, as well as golf and sports-field groundskeepers.

Louisville Green heat-dried pellets stay in the soil longer, and release their nutrients slowly, which means fewer applications are needed. Fertilizers that dissolve too quickly can lead to high levels of nitrogen in waterways—which encourages prolific algae growth and depletes the oxygen supply fish and other life forms need to survive.

MSD processes and distributes approximately 30,000 dry tons of Louisville Green annually—saving more than 1 million cubic feet of landfill space per year. The Environmental Management System’s National Biosolids Partnership certifies the Louisville Green production facility, located at the MSD Morris Forman Water Quality Treatment Center. Louisville Green also meets the U.S. Environmental Protection Agency’s stringent requirements for land applied biosolids.


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