EPA program continues tackling landfill methane
The Environmental Protection Agency (EPA) tracks municipal solid waste (MSW) landfill data through the Landfill Methane Outreach Program (LMOP). This voluntary program encourages recovery and use of landfill gas (biogas) generated from MSW landfills, which is seen as a significant energy source.
The LMOP database has over 2,600 MSW landfills that are either still accepting waste or have closed in the previous few decades. As of August 2022, there are 470 “candidate” landfills, meaning landfills that could cost-effectively have their biogas turned into an energy resource, along with an additional 538 operational projects that are successfully doing just that. The state of California alone has the most operational projects at 56.
Landfill gas is made up of roughly half methane and half carbon dioxide with small quantities of non-methane organic compounds. MSW landfills are the third-largest source of human-related methane emissions in the country. Exposure to these compounds can lead to adverse health effects if uncontrolled. When used as an energy source, one landfill gas energy project can capture around 60 to 90 percent of the methane emitted from the landfill. This in turn can significantly reduce methane emissions.
The LMOP data helps beyond finding out information on landfill gas and methane capturing. It also discloses, among other data, the following for each landfill:
- Year landfill opened,
- Expected year of landfill closure,
- Landfill capacity in tons, and
- The current waste in place in tons.
Countless open landfills are nearing capacity and are set to close in the next five years. In 2023 alone, 18 MSW landfills in the LMOP database are set to close. Nearing landfill capacity and growing methane emissions are intertwined. Landfills with more waste typically have potential for greater landfill gas recovery. The LMOP database includes some very large landfills in current operation. The following open landfills have the largest current waste in place in the database:
- McCarty Road LF in Texas has 99,568,809 tons,
- Apex Regional LF in Nevada has 75,395,672 tons,
- Monarch Hill Landfill in Florida has 73,941,023 tons, and
- Denver Arapahoe Disposal Site (DADS) in Colorado has 73,469,116 tons.
Energy recovery and the use of biogas generated from MSWs is seen as a benefit. However, one mustn’t lose sight of the fact that decreasing waste output in the first place would help decrease methane emissions. The burden cannot fall entirely on landfill owners and operators. Landfill waste starts with the generators themselves.
Key to remember: The Landfill Methane Outreach Program encourages recovery and use of landfill gas.
























































