Solid Waste District O is a quasi-government agency overseen by the Missouri Department of Natural Resources. District O is one of 20 districts in Missouri, and District O’s region serves five counties in the southwest region of the state: Christian, Dallas, Greene, Polk and Webster.

The primary function of District O is to fund solid waste diversion projects in its district through a grant reimbursement program. Since its inception, more than $4 million has been awarded to the community through waste diversion projects, like recycling, composting, and repurposing. The grant program is funded by tipping fees at the Springfield Noble Hill Sanitary Landfill.