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Overview 
Verra has opened a public consultation on a minor revision (methodology development ID #M0370) to Clean Development Mechanism (CDM) methodology AMS-III.Y.: Methane avoidance through separation of solids from wastewater or manure treatment systems, v4.0. The revised methodology would be published in the Verified Carbon Standard (VCS) Program. The consultation will run from February 6 through March 9, 2026.
AMS-III.Y. applies to project activities that avoid or reduce methane production from anaerobic wastewater treatment systems and anaerobic manure management systems through the removal of volatile solids from the wastewater or manure slurry stream. The separated solids are further treated, used, or disposed in a manner resulting in lower methane emissions.
The proposed revision includes the following updates:
- It allows the use of separated solids from animal manure as bedding material in barns. It also introduces measures to prevent negative impacts on animal welfare, human health, and the environment, as well as calculation procedures for potential additional methane emissions.
- It provides quantification procedures for projects using biofiltration systems (such as vermicomposting) to separate the solids, expanding the scope of the methodology.
- It requires the use of VCS tool VT0008 Additionality Assessment for the purposes of demonstrating additionality to increase robustness of these assessments.
Feedback
Please see the public consultation document for the full background and details about the proposed updates.
Verra is accepting feedback through its digital public consultation platform, which is hosted on the Verra Project Hub. Stakeholders will need to use the link provided to enter their personal details, confirm their email address, and access the online consultation form. For additional guidance, please review the user guide (PDF).
Comments may be submitted electronically via the online form by 11:59 pm Anywhere on Earth (UTC-12) on March 9, 2026. If you experience issues using the digital public consultation platform or have feedback on it, please contact hubsupport@verra.org.