Wastewater methane capture and treatment projects are an emissions-reduction project type within the waste & methane segment of the carbon market. They are designed to reduce methane from wastewater treatment systems. The carbon benefit comes from avoided methane emissions from wastewater treatment and disposal. Common project configurations include Industrial wastewater methane capture; covered lagoons; improved treatment systems.

Monitoring is especially important because wastewater systems can have variable loads and emissions profiles across sites and seasons. Many of these pathways focus on methane or other potent non-CO2 gases, so they can have strong near-term climate significance; at the same time, the integrity of baseline assumptions, destruction efficiency, and ongoing monitoring is especially important. For buyers and program designers, the most important diligence questions are: Would the treatment upgrade have occurred anyway? Are influent loads, methane factors, and destruction efficiencies robust?