The state of Missouri has cited the Courtney Ridge landfill in Sugar Creek over emissions of methane and other gases.

The state of Missouri has cited the Courtney Ridge landfill in Sugar Creek over emissions of methane and other gases.

The Department of Natural Resources has issued a notice of violation to Republic Services Inc. The agency says the company has released too much methane. The company is required to come up with an emergency gas management plan, notify residents within 1,000 feet of the well and offer nearby property owners methane detectors as needed.

Landfills create methane, carbon dioxide and other contaminants as trash decomposes. If concentrated enough, methane can be explosive. The DNR has been working with the 15-year-old landfill for several years to control the movement of the gas, and the agency says the company is investigating how the gases are spreading and how far they are spreading.