Microbes Tested to Cut Methane at California Landfill

New trial uses natural microbes to tackle landfill methane and odors

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A new field trial at Republic Services' Sunshine Canyon Landfill in Sylmar, California, is putting microbes to work in a bid to curb methane emissions and control odors. Developed by Windfall Bio, this approach uses naturally occurring soil microorganisms — referred to as "mems" — that consume methane while also breaking down hydrogen sulfide and other odor-causing compounds.

Michael Stewart, General Manager of Sunshine Canyon Landfill, discussing the project says “We remain committed to embracing solutions for better environmental management of landfills for our local communities.”

The project responds to longstanding challenges with traditional gas collection systems, which often fail to fully capture surface emissions. By applying these microbes directly to the landfill cover, the trial aims to demonstrate a practical, low-barrier addition to existing landfill management strategies. Unlike conventional infrastructure-heavy solutions, this microbial method can be integrated into current operations without major overhauls.

Methane is a critical target, given its global warming potential is more than 25 times that of carbon dioxide. In parallel, addressing other VOCs and odors has become a key community concern, with local enforcement agencies pushing for stricter air quality controls. By tackling both, the trial could provide landfill operators with a dual-purpose tool to meet compliance targets and improve neighborhood relations.

Broader Applications for Biological Methane Solutions

Windfall Bio's trial at Sunshine Canyon is part of a wider strategy to showcase biological methane mitigation across various industries. Beyond landfills, the company is testing this technology in agriculture and oil and gas operations, highlighting its flexibility and potential for broader adoption.

Josh Silverman, co-founder and CEO of Windfall Bio shared that “Windfall is committed to uncovering new applications for mems, and we are thrilled to be working with the innovative team at Sunshine Canyon Landfill that’s advancing industry standards. Windfall is eager to provide an effective, scalable, and economic solution.”

For Republic Services, one of the largest players in the U.S. waste sector, this collaboration aligns with ongoing efforts to reduce emissions and advance environmental initiatives. The Sunshine Canyon site already features landfill gas-to-energy systems and other advanced environmental safeguards, positioning it as a natural choice for piloting new technologies.

Data gathered from the trial will inform future deployments and help establish biological solutions as a complement to existing gas capture systems. The ultimate goal is to scale up nature-based approaches to emissions reduction, offering landfill operators and other heavy emitters an additional, cost-effective way to meet increasingly stringent climate and community standards.

Environment + Energy Leader